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Tonk
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Comet C/2012 K5 is ready for chasing
      #5519074 - 11/14/12 05:13 AM

If you want a comet to chase then its time to switch to C/2012 K5 (LINEAR) as Hergenrother fades away - from now and next month its brightening fast - peaking possibly near mag 8 on New Years day. For the last four weeks it has been tracking slowly over the shoulder of Bootes while turning to line up with Ursa Major. It will soon track through the Big Dipper/Plough tracing a path from the tip of the great bear's tail to the tip of it's nose.

However it initially favours those in the far north best as its extremely low or even set for most of the night for those at lower latitudes during November and the early/mid period of December. Right now its in the process of switching from a predominantly evening object to a morning object.

During the last few days of December and all of January its all-night visibility vastly improves as it rapidly races through Lynx, Auriga, Taurus and the Orion/Eridanus border before slowing to a crawl again and turning east under Orion.

http://www.aerith.net/comet/catalog/2012K5/2012K5.html


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Astrodj
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5519488 - 11/14/12 12:42 PM

Thanks, Tonk.

I'll start looking for it. Any kind of structure or tail visible yet?


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OldDeadOne
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Re: Comet C/2012 K5 is ready for chasing new [Re: Astrodj]
      #5520351 - 11/14/12 11:35 PM

I'll be looking for it toward the end of December/early January,thanks Tonk!

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Scanning4Comets
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Re: Comet C/2012 K5 is ready for chasing new [Re: OldDeadOne]
      #5520577 - 11/15/12 05:20 AM

Thanks also from me Tonk!

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Fred76
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Re: Comet C/2012 K5 is ready for chasing new [Re: Scanning4Comets]
      #5521691 - 11/15/12 06:30 PM

Thanks Tonk. I forwarded the alert on the french forum Webastro.

Fred

Edited by Fred76 (11/15/12 06:32 PM)


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coldfielder
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5522326 - 11/16/12 06:40 AM

Trying several mornings already to catch him for a first observation, but still bad weather. Anyway, my applet with comet positions on a simulated night sky is also extended with this comet C/2012 K5, also showing which deepsky objects shall stand close to it, there are some interesting ones. Hopefully an easy target this new comet!

http://users.skynet.be/fc219947/comshowr/ComShowr.html


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Centaur
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5523659 - 11/16/12 11:48 PM

I've created a display of the orbits of the Earth and C/2012 K5 as viewed from far north of the ecliptic and an ephemeris. They can be seen at www.CurtRenz.com/comets

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tboss70
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Re: Comet C/2012 K5 is ready for chasing new [Re: Centaur]
      #5526195 - 11/18/12 01:54 PM

Thanks for the update Tonk.

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Special Ed
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Re: Comet C/2012 K5 is ready for chasing new [Re: tboss70]
      #5533631 - 11/22/12 09:55 AM Attachment (94 downloads)

Got my first look at C/2012 K5 (LINEAR) this morning. It took a while for Bootes to rise above the mountain to my NE so I didn't have much time to look before the sky began to lighten. The zodiacal light was very prominent this morning too--glad the comet is not over in that part of the sky.

I first picked it up at 75x--not real bright but definitely not hard to spot (especially with dark, transparent skies).

The comet is pretty well condensed with a fan shaped tail. Hopefully this one will be fun to chase--thanks for the heads up Tony and thanks also to Curt for the charts.

Here's the sketch:


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Mike B.
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Re: Comet C/2012 K5 is ready for chasing new [Re: Special Ed]
      #5533704 - 11/22/12 10:37 AM

Nice sketch! That looks really promising as a photographic target, too. My NE is dominated by LP, unfortunately.

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SteelStar
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Re: Comet C/2012 K5 is ready for chasing new [Re: Special Ed]
      #5533724 - 11/22/12 10:48 AM

Excellent observation.

I have been wanting to capture this comet but just can't seem to get myself out of bed early in the morning since its turning colder.

Very nice sketch. Looks like it may be a pretty good comet to track. Well done.


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canukLX90
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Re: Comet C/2012 K5 is ready for chasing new [Re: Special Ed]
      #5535602 - 11/23/12 02:15 PM

Thanks for posting your observation and sketch. Well done.
Weather has been its usual with storm after storm rolling
in off the Pacific so no opportunity to get up early and
view this fuzz ball.

Cheers

PJ


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Special Ed
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Re: Comet C/2012 K5 is ready for chasing new [Re: canukLX90]
      #5536679 - 11/24/12 06:17 AM

Mike, SteelStar, PJ, thanks! Hope you all get a chance soon.

I read a report on the Yahoo comet obs group that this comet's tail was at position angle 20°. I put it at PA 340°. One of us is confused--not sure who.


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Centaur
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Re: Comet C/2012 K5 is ready for chasing new [Re: Special Ed]
      #5537085 - 11/24/12 11:28 AM

Quote:

I read a report on the Yahoo comet obs group that this comet's tail was at position angle 20°. I put it at PA 340°. One of us is confused--not sure who.




340° would have been about right. Position angle is measured counterclockwise from celestial north. Your Yahoo source may have mistakenly measured clockwise, or perhaps meant -20° which is equivalent to +340°.


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Tonk
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Re: Comet C/2012 K5 is ready for chasing new [Re: Centaur]
      #5537484 - 11/24/12 04:28 PM

I've been imaging this comet for the last month (in its now near gone evening slot) - nice fan tail and yes it is noticibly brighter now

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Special Ed
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Re: Comet C/2012 K5 is ready for chasing new [Re: Centaur]
      #5538762 - 11/25/12 01:52 PM

Quote:

Quote:

I read a report on the Yahoo comet obs group that this comet's tail was at position angle 20°. I put it at PA 340°. One of us is confused--not sure who.




340° would have been about right. Position angle is measured counterclockwise from celestial north. Your Yahoo source may have mistakenly measured clockwise, or perhaps meant -20° which is equivalent to +340°.




Thanks for the confirmation, Curt. My source posted another more recent observation with the PA of the tail at 350°. He was using an SCT and might have forgotten he had a mirror-reversed view. More likely, I checked back and his observation was 10 days before mine and the PA might have shifted over that time. His more recent obs was the same date as mine and we are within 10° and both to the west.


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Special Ed
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5538777 - 11/25/12 01:58 PM

Quote:

I've been imaging this comet for the last month (in its now near gone evening slot) - nice fan tail and yes it is noticibly brighter now




Tony, have you posted your images anywhere?


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Tonk
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Re: Comet C/2012 K5 is ready for chasing new [Re: Special Ed]
      #5539801 - 11/26/12 04:26 AM

Quote:

Tony, have you posted your images anywhere?





Sorry no - I'm making an effort to get the data but I've too little time to go through the processing steps though. I'm currently under the whip from my PhD supervisors so I have to deliberately avoid distractions . I could slap up a rough "straight from camera" if you just want to have a look. Hopefully Mike B will do the honors with his efforts as I know he will turn his sights to this one soon


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Special Ed
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5541962 - 11/27/12 11:55 AM

Sounds like you're keeping your nose to the grindstone. Good that you have some early data to compare to the comet's appearance later on when you have more time to process it.

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canukLX90
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Re: Comet C/2012 K5 is ready for chasing new [Re: Special Ed]
      #5543265 - 11/28/12 03:31 AM Attachment (66 downloads)

I managed to get a 8 30 second subs on the morning of the
26th just before sunrise. the comet has a good defined
nucleus and a bit of a tail showing. The star to the right
of the comet is magnitude 12.7 Hopefully darker skies in
a week or two will allow a another attempt.

Cheers

PJ


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Special Ed
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Re: Comet C/2012 K5 is ready for chasing new [Re: canukLX90]
      #5547042 - 11/30/12 11:52 AM

Thanks for posting your image, PJ.

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Tonk
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Re: Comet C/2012 K5 is ready for chasing new [Re: canukLX90]
      #5565492 - 12/11/12 07:59 AM

I had some clear weather this morning so I took a peek at 05:30 UT. This comet is shaping up, estimate a 10' fan tail and bright nucleus around mag 8 to 9 ish. Prelimiary images show greenish small coma. Nearly overhead at onset of twilight at 07:00. Cresent moon, Venus and Mercury low to SE were fantastic too. Worth getting up for!

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tboss70
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5567849 - 12/12/12 03:40 PM

Recent picture here: (scroll down)
http://astrobob.areavoices.com/2012/12/09/squiggly-tailed-comet-c2012-v4-eyed...

I have too many tall trees at my location


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Tonk
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Re: Comet C/2012 K5 is ready for chasing new [Re: tboss70]
      #5568701 - 12/13/12 05:58 AM

Yeah thats exactly how my prelim images look - even the green coma

Your trees must surround you as the comet is direct overhead just before dawn!


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Jure Atanackov
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5568723 - 12/13/12 06:44 AM

I had a good look at it last night with a 20" f/4 Dob at 80x under rather poor SQM 21.0 skies. The comet was still at only about 15° altitude and inside a light dome, but a very condensed coma and a curved fan tail, about 10' long were easily visible. It would certainly have looked much better later in the night at a higher elevation, but still, quite an impressive sight. Had 11x70 and 20x110 binos ready, but after 6 hours in -13 °C and 50 cm of snow I wasn't too keen on waiting for another 2-3 hours
Clear skies!
Jure


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OldDeadOne
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Re: Comet C/2012 K5 is ready for chasing new [Re: Jure Atanackov]
      #5569786 - 12/13/12 07:23 PM

bright enough for binoculars yet?

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Rich (RLTYS)Moderator
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5580207 - 12/20/12 08:24 AM Attachment (36 downloads)

Took this image of C/2012 K5 on the 19th with the Slooh Remote Observatory.

Rich (RLTYS)


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MessiToM
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Re: Comet C/2012 K5 is ready for chasing new [Re: Rich (RLTYS)]
      #5580670 - 12/20/12 01:14 PM

man these f n clouds need to get lost......I wana see this thing

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Bill Whitehead
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Re: Comet C/2012 K5 is ready for chasing new [Re: MessiToM]
      #5580854 - 12/20/12 02:55 PM

Tried to see it with an 8 inch Dob at 5AM and didn't see anything. It must be pretty diffuse.

Bill


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Tonk
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Re: Comet C/2012 K5 is ready for chasing new [Re: Bill Whitehead]
      #5581196 - 12/20/12 06:03 PM

Quote:

It must be pretty diffuse




Quite the opposite - its quite condensed and bright - are you sure you looked in the right place?


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Centaur
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5581256 - 12/20/12 06:48 PM

Best viewing location if the skies are clear: The Seattle-Vancouver area where the magnitude +8.0 comet will be in the zenith when it makes its closest approach to the Earth's surface at 0.2937 AU on 2012 DEC 31 at 00:20 PST. The ideal spot is W 124.94° - N 48.42° which is in the Pacific Ocean about seven miles west of the northwest corner of Washington State at the US-Canadian border.

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Coy
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Re: Comet C/2012 K5 is ready for chasing new [Re: Centaur]
      #5581784 - 12/21/12 01:26 AM

Found it in my 8 tonight when it was around 20 to 24 degrees off the horizon. Difficult to spot. Not much coma. Condensed is definitely the word to use, but not bright. Tail was short and mainly visible with averted vision or a shimmy of the scope. I'm assuming things will improve significantly as it progresses. Was not easy comet to pick off and certainly didn't have the same kind of presence I observed with Hergenrother or Garradd.

I'll be checking back in on this one to see how things change.


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CosmoSat
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Re: Comet C/2012 K5 is ready for chasing new [Re: Bill Whitehead]
      #5582522 - 12/21/12 01:34 PM Attachment (47 downloads)

Quote:

Tried to see it with an 8 inch Dob at 5AM and didn't see anything. It must be pretty diffuse.

Bill




Hi,

As Tonk said..its bright and easy to find, it looks elongated but couldnt detect any tail, as when we observed it on the morning of 16th this month...the sky wasnt very clear with the thin cloud cover sailing over getting views inbetween. It was near alioth and hence made for an easy hop. will try again before the moon moves in..

Hoping that it may prove useful to some I am attaching a map that will give a rough idea of where the comet will be the next few days..

Clear Skies!


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Achernar
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5583911 - 12/22/12 11:28 AM

Lo and behold, I located it from my driveway last night with my 15-inch truss-tube Dob. It showed a short tail, but between the moon still lighting up the sky at midnight and a streetlight right across from my house, it was not much to look at. At least it was recognizable as a comet.

Taras


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SteelStar
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Re: Comet C/2012 K5 is ready for chasing new [Re: Achernar]
      #5584243 - 12/22/12 03:07 PM Attachment (31 downloads)

I finally observed this comet last night using my trusty ST120 refractor.

I first found it about a degree and a half (below) from the star Dubhe at about 11:30 pm with a 70% waxing gibbous Moon high in the sky.

I got a little sleep and went back out and found it again about 2:30 am after the Moon had went down.

The comet was visible with low power but not my 9 x 50 finder. This comet seemed small to me and maybe had a brighter nucleus with adverted vision. A faint fan shaped tail was visible with hints of being longer than was obvious. At 11:30 pm it formed a nice triangle with a pair of stars and after about 3 hours when I came back out it had moved about 23 arc/min up next to a 9.4 mag star. When I defocused this star to about the size as the comet it was about the same mag.

Hopefully I will get my 12" dob on it soon. Sketch is flipped to match refractor view and shows movement between my two observing times.


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Scanning4Comets
Markus
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Re: Comet C/2012 K5 is ready for chasing new [Re: SteelStar]
      #5584862 - 12/22/12 11:26 PM

If we get some clear skies here, I can try to bag this comet!

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CosmoSat
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Reged: 07/24/09

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Re: Comet C/2012 K5 is ready for chasing new [Re: Scanning4Comets]
      #5584935 - 12/23/12 12:18 AM

Observed it again tonight through better skies and when it was higher up near the meridian, definitely looks different than how it was last week...the denser brighter elongation appears less condensed now, more spread out really..and could see the tail flared downwards(as it appeared in the eyepiece). Not as bright as M81 nearby tho larger in size but much brighter than M51.

Clear Skies!


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tboss70
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Re: Comet C/2012 K5 is ready for chasing new [Re: CosmoSat]
      #5585028 - 12/23/12 02:08 AM Attachment (32 downloads)

My quick, single, 3 minute photo at 100%.

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dan777
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Re: Comet C/2012 K5 is ready for chasing new [Re: tboss70]
      #5585317 - 12/23/12 10:12 AM

Well, I finally got a chance to see it this morning. Transparency and seeing were mediocre but I could see the big dipper so I went for it. It was easy to spot and I could see a faint tail. It was only 50 arcminutes from Dubhe. 85x was best.

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Ira
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Re: Comet C/2012 K5 is ready for chasing new [Re: dan777]
      #5585348 - 12/23/12 10:36 AM

Any links to daily coordinates?

/Ira


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dan777
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Re: Comet C/2012 K5 is ready for chasing new [Re: Ira]
      #5585382 - 12/23/12 10:59 AM

Quote:

Any links to daily coordinates?



http://ssd.jpl.nasa.gov/horizons.cgi#results
Search Target Body for C/2012 K5 then click on Generate Ephemeris


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tboss70
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Re: Comet C/2012 K5 is ready for chasing new [Re: Ira]
      #5585458 - 12/23/12 11:54 AM

On my picture above, Im not sure if 3 minutes was too long or if the core just wasn't visible? Maybe my focus was off a little too?

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Centaur
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Re: Comet C/2012 K5 is ready for chasing new [Re: Ira]
      #5585542 - 12/23/12 12:48 PM

Quote:

Any links to daily coordinates?

/Ira




Yes, Ira, on my comets webpage: www.CurtRenz.com/comets

There you will find both the comet's coordinates for J2000.0 for standard maps, and for the current date as needed for aiming telescopes.


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Tonk
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Re: Comet C/2012 K5 is ready for chasing new [Re: Centaur]
      #5586105 - 12/23/12 06:32 PM

Quote:

Any links to daily coordinates?




Yes lots - the Harvard / MPC ephemeris is best

MPC ephemeris

BAA ephemeris

"Astrosite" charts

Skyhound charts



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Ira
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5586222 - 12/23/12 08:24 PM

Thanks!

/Ira


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Centaur
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Re: Comet C/2012 K5 is ready for chasing new [Re: Ira]
      #5586462 - 12/23/12 11:41 PM

Quote:

Thanks!

/Ira




You’re welcome, Ira. I’m glad everyone is having fun with this comet.

I’ve updated my ephemeris and graphics for this comet to its osculating orbital elements of epoch 2013 JAN 01.0. Previously they were for epoch 2012 NOV 29.0. Other sources still depend on much earlier epochs, despite the effects of planetary perturbations. The elements I use were provided by Dr. Aldo Vitagliano’s highly accurate Solex astronomical numerical integration program: http://main.chemistry.unina.it/~alvitagl/solex . I then run them through the orbit determination algorithm of his friend Jean Meeus. BTW, Aldo is a member of the Cloudy Nights message board. See his latest contribution at post #2 in the thread at: http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/5570752/page...

The comet’s coordinates in my ephemeris are given in decimal form. That’s to ease interpolation, i.e. the process of estimating positions at moments other then 00 UT.

Linear interpolation usually suffices to determine an intermediate position P:

A = Position at Day 1
B = Position at Day 2
F = Fraction of a Day since A ( 12 hours would be 0.5 )
P = A + ( B – A ) x F

However, when an object appears to traverse the sky rapidly as this comet is now, second degree interpolation will provide greater accuracy:

A = Position at Day 1
B = Position at Day 2 ( nearest 00 UT to time in question )
C = Position at Day 3
D = ( C – A ) / 2
E = ( C + A ) / 2 - B
F = Fraction of a Day since B ( F can be negative, although F² is always positive )
P = B + D x F + E x F²

My comet ephemerides and related graphics are at: www.CurtRenz.com/comets

Edited by Centaur (12/24/12 02:44 PM)


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Dave Mitsky
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Re: Comet C/2012 K5 is ready for chasing new [Re: Centaur]
      #5586690 - 12/24/12 06:32 AM

Despite moonlight and poor transparency, I was able to locate and observe Comet C/2012 K5 (LINEAR) this morning using the 17" f/15 classical Cassegrain at the ASH Naylor Observatory. I used magnifications of 162, 185, 216, and 259x initially.

The comet sported a somewhat condensed nucleus and a rather short tail that fanned out in a narrow fashion.

By the time the moon had set, the transparency had improved and I had a far better view of the 8th-magnitude comet. At 360x, the comet's motion was apparent in the span of approximately ten minutes.

While I couldn't see C/2012 K5 (LINEAR) through the 5" f/5 finder scope earlier, I was able to spot it at 35 and 45x after the conditions had improved.

Dave Mitsky


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MessiToM
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Re: Comet C/2012 K5 is ready for chasing new [Re: Dave Mitsky]
      #5586980 - 12/24/12 10:51 AM

I also was able to view this comet this morning 3am est. Using a 17.5" reflector it was "obvious" as was the fan tail and "long" nucleus. Using averted vision helped greatly though.

I forgot to mention seeing was only so so. I'd say transparency of 2 or 3 out of 5

Edited by MessiToM (12/24/12 10:55 AM)


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Bagleys
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Re: Comet C/2012 K5 is ready for chasing new [Re: MessiToM]
      #5587150 - 12/24/12 12:28 PM

I saw it from my driveway at 2AM Saturday Morning with the 13" Coulter. Elongated center was clearly visible but just a hint of tail with averted vision. It was really exciting. Seeing and transparency were good but I have plenty of light pollution (street lamp about 50 feet away). Stellarium has it at around 10.5 MAG now and brightest on the 30th, then beginning to dim in January.

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MessiToM
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Re: Comet C/2012 K5 is ready for chasing new [Re: Bagleys]
      #5587218 - 12/24/12 01:13 PM

I didnt know stellarium showed comets. Ive been using sky tools 3 and starry night

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Tonk
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Re: Comet C/2012 K5 is ready for chasing new [Re: MessiToM]
      #5587326 - 12/24/12 02:34 PM

Quote:

I didnt know stellarium showed comets




You can hook up directly to MPC comet data see instructions here - http://stargazerslounge.com/topic/113971-adding-comets-asteroids-and-small-bo...


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dan777
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Re: Comet C/2012 K5 is ready for chasing new [Re: Bagleys]
      #5587756 - 12/24/12 09:14 PM

Quote:

Stellarium has it at around 10.5 MAG



It's difficult to predict an accurate magnitude of a comet. Stellarium typically sets Albedo=1 in it's definition file (ssystem.ini) for all comets. So the actual magnitude can easily differ by a couple of magnitudes from what Stellarium shows it to be.


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Re: Comet C/2012 K5 is ready for chasing new [Re: dan777]
      #5587874 - 12/24/12 11:12 PM

C/2012 K5 (LINEAR) is currently in the eighth-magnitude (or so) range.

Dave Mitsky


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Re: Comet C/2012 K5 is ready for chasing new [Re: Dave Mitsky]
      #5588100 - 12/25/12 05:10 AM

Quote:

It's difficult to predict an accurate magnitude of a comet




Possibly - but its not to hard to take measurements and fit the results to well established modeling equations to get a reasonable prediction of future brightness - assuming no future disruptions, switch offs etc

The current best fit for estimating the brightness of this comet is:

m1(t) = 9.5 + 5 log d + 13.0 log r

(where d is the geocentric distance and r is the heliocentric distance at date/time t. I.e. M0 = 9.5 and n = 5.2 in standard eq M1 = M0 + 5 log d + 2.5n log r)

If you want up to date brightness measurements and future trends then look here

http://www.aerith.net/comet/catalog/2012K5/2012K5.html

Scroll down for the graph


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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5588248 - 12/25/12 09:47 AM

A word or two concerning comet magnitude predictions seen on Internet sites and blogs might prove worth while at this juncture considering we have comets PANSTARRS and ISON in the offing. The unfortunate situation regarding the "best fit" photometric parameters put forth on nearly all the Internet sites are based on the combined unevaluated/unadjusted data from a large cross section of observers of unknown actual experience in estimating comet brightnesses, which is an art in itself which relatively few observers ever truly master.

Likewise, allowance for the nature and size of the instruments being employed for the observations are mostly also neglected, even though these have been known to introduce a significant bias for decades. These two factors alone, and there are others that are likewise neglected, typically lead to derived formulae resulting in excessively bright magnitude predictions as compared to what is later seen.

In the case we have here in Comet 2012K5, the value of "n" derived from the raw data implies a value of 5.2 (2.5*n) which if taken at face value would be a surprisingly large figure, one far more commonly seen as applicable to a short period comet.

Unfortunately, one sees this sort of situation arising all too often in regard to Internet predictions of major comet brightness and leading to excessively high predicted mgnitudes for some future date when the object is near periheliion...as was the silliness surrounding Comet Elenin last year, which never had a real chance of becoming a significant object.

Brooks Obs

Edited by BrooksObs (12/26/12 03:56 PM)


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astrocy
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Re: Comet C/2012 K5 is ready for chasing new [Re: BrooksObs]
      #5589510 - 12/26/12 11:13 AM

Early this morning under a dark and moonless sky, I was able to spot the comet using 15x70 binoculars near the stars 23 UMa and 16 UMa, not far away from the boarder of Ursa Major with Lynx. The comet had an elongated nebulous appearance and its coma was visible with direct vision despite its low magnitude. A hint of a tail was also suspected with averted vision.

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Re: Comet C/2012 K5 is ready for chasing new [Re: astrocy]
      #5590635 - 12/27/12 01:12 AM

Hi, you can have a look to two sketches :
http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/5583470/page...
Made with a 102/1000 refractor with 40mm EP.
Michel


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Aquarellia
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Re: Comet C/2012 K5 is ready for chasing new [Re: Special Ed]
      #5590637 - 12/27/12 01:16 AM

Quote:

Got my first look at C/2012 Linear


Nice Spécial ED ! Well done Michel

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Re: Comet C/2012 K5 is ready for chasing new [Re: Aquarellia]
      #5591483 - 12/27/12 05:09 PM

There's a fine image of C/2012 K5 (LINEAR) posted at http://www.cometpieces.at/images/phocagallery/2012k520121213lrgbweb_2.jpg

It was captured by Michael Jäger on December 13th.

http://www.cometpieces.at/

Dave Mitsky


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Re: Comet C/2012 K5 is ready for chasing new [Re: Dave Mitsky]
      #5594159 - 12/29/12 10:59 AM

"forbidden" to follow that link

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Dave Mitsky
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Re: Comet C/2012 K5 is ready for chasing new [Re: MessiToM]
      #5594229 - 12/29/12 11:47 AM

?

Those links were working just fine a couple of days ago.

Dave Mitsky


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MessiToM
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Re: Comet C/2012 K5 is ready for chasing new [Re: Dave Mitsky]
      #5594237 - 12/29/12 11:51 AM

Yea I know. I saw a "post" in the comet chasing yahoo group.....weird

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Tonk
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Re: Comet C/2012 K5 is ready for chasing new [Re: MessiToM]
      #5594483 - 12/29/12 01:57 PM

Yes I can confirm they were working yesterday. Looks like the server is down

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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5594614 - 12/29/12 03:25 PM

I may have an opportunity to image tonight. What is the longest exposure I can take before trailing?

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Re: Comet C/2012 K5 is ready for chasing new [Re: tboss70]
      #5594651 - 12/29/12 03:55 PM

Quote:

What is the longest exposure I can take before trailing?




Thats depends on your focal length. I'd just bracket some exposure lengths say 120, 150, 180 seconds and see what smearing you get and pick longest that still looks Ok


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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5594701 - 12/29/12 04:39 PM

I'm at 900mm (f9) with a canon 350d.
I'll give that a try Tonk.


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Re: Comet C/2012 K5 is ready for chasing new [Re: tboss70]
      #5594756 - 12/29/12 05:28 PM

if you want to complicate it with math then see this article: http://www.astropix.com/GADC/SAMPLE7/SAMPLE7.HTM

but the comet has it proper motion so still okay trying different exposures.


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drbyyz
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Re: Comet C/2012 K5 is ready for chasing new [Re: JoseBorrero]
      #5594857 - 12/29/12 06:31 PM

Added this to my list for the next trip out with the scope. Should be a fun one. SkySafari on my Iphone is registering it so I'll try locating it using that at first, can always check back on this thread for more accurate details if needed.

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Re: Comet C/2012 K5 is ready for chasing new [Re: drbyyz]
      #5595591 - 12/30/12 05:32 AM

900mm FL is quite long for comet photography. You have two problems the longer FL will pick up motion far sooner and the image is dimmer compaired to say 480mm where I image. Focal reducers help here. The motion of this comet is now high and I'm expecting to max out at around 2 minute exposures at 480mm

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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5595760 - 12/30/12 09:48 AM

Thanks Tonk. Dont I know its dim ;-)
I've been looking at reducers but I may just wait and pick up a smaller, better scope just for this purpose.
Until then, I better set the ISO to 1600 and hope for the best.


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Re: Comet C/2012 K5 is ready for chasing new [Re: tboss70]
      #5596254 - 12/30/12 02:23 PM

Quote:

I better set the ISO to 1600 and hope for the best




Good move


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eps0mu0
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5597255 - 12/31/12 12:55 AM

I saw it this evening at 9:15pm PDT. In my C6 and under light polluted skies, it was a faint, undifferentiated fuzzy blob. It was too faint to make out any hint of condensation, let alone a tail. But, I am glad I got to see another comet.
I used CdC to get approximate position relative to fixed stars, and starhopped to a spot slightly less in R.A. than Psi 6 Aurigae. I observed using a Celestron C6 (1500 mm nominal fl) at 60x.


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astrocy
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Re: Comet C/2012 K5 is ready for chasing new [Re: eps0mu0]
      #5597422 - 12/31/12 05:50 AM

Following my previous observation of the comet, I managed to saw it again this evening just before moonrise. Using 15x70 binoculars it was easy to spot near the boarder of Lynx with Auriga and had a similar appearance with its coma particularly evident.

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RolandosCY
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Re: Comet C/2012 K5 is ready for chasing new [Re: astrocy]
      #5597803 - 12/31/12 11:43 AM

Quote:

Following my previous observation of the comet, I managed to saw it again this evening just before moonrise. Using 15x70 binoculars it was easy to spot near the boarder of Lynx with Auriga and had a similar appearance with its coma particularly evident.



I did spot the comet a few minutes ago with my Tak FS102 from within the bright skies of the suburbs of Larnaca. Under my SQM 19.2 skies it was detectable with direct vision. A slightly brighter nucleus was visible within a broad, ill-defined coma. No tail was detected.

The comet was not detectable from my location in 15X70 binoculars, even after it was detected with the refractor and its exact position was known. AstroCY, from which area did you observe it in binos?


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Tonk
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Re: Comet C/2012 K5 is ready for chasing new [Re: RolandosCY]
      #5600178 - 01/01/13 07:21 PM

I've had my first chance for a while to image the comet in the 3 hour window before moon rise tonight. Its shifting very fast now!!!!! I estimate tonight that its moving a moons width roughly every 2 hours 40 minutes now.

Our viewing angle on the tail is also changing fast now so the comets shape is changing as our shifting viewing angle swings the dust tail over

We are also just passing the comets peak brightness as it rapidly passes Earth.


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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5600275 - 01/01/13 08:26 PM

I just set up and took a quick 2o second exposure. It looks much better with no slight overcast and moon out.
I could see a very bright coma at only 20 seconds (900 mm FL; ISO800 with 350d)
Im running several 1 minute exposure right now. Pictures later tonight.


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norton67
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Re: Comet C/2012 K5 is ready for chasing new [Re: tboss70]
      #5600332 - 01/01/13 09:04 PM

I got a peek at it tonight. There was a break in the clouds just long enough to see a smudge with my 12x50 binoculars.

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Re: Comet C/2012 K5 is ready for chasing new [Re: norton67]
      #5600429 - 01/01/13 10:09 PM

Dang it! 50 seconds at 900mm FL is just a little too long. She's movin' quick! For my 900mm I bet 30-40 seconds may be the max.

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tboss70
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Re: Comet C/2012 K5 is ready for chasing new [Re: tboss70]
      #5600549 - 01/01/13 11:41 PM Attachment (27 downloads)

Not much to talk about but here it is. Tomorrow night I'll try 30-40 second exposures at a higher ISO.

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tboss70
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Re: Comet C/2012 K5 is ready for chasing new [Re: tboss70]
      #5600552 - 01/01/13 11:47 PM Attachment (25 downloads)

If anyone is interested, this was at 900mm FL.

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Tonk
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Re: Comet C/2012 K5 is ready for chasing new [Re: tboss70]
      #5604107 - 01/04/13 05:26 AM

Looks like my observing has been curtailed by the weather for at least a week - just when the comet is at it most interesting with its rapidly changing viewing angle now that Earth has passed through teh comets orbital plane a few days ago

Has anyone been observing this comet in the last 2 days? The posts here have suddenly stopped


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Aquarellia
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5604118 - 01/04/13 05:39 AM Attachment (35 downloads)

Hi, thanks for posting here as well. In South France the sky is ok, maybe another view tonight.
It's amusing to see that the comet tail is now after the coma.
As a sketcher... I post in another place, look at :
http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/5583470/page...
Sorry for that.


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tboss70
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Re: Comet C/2012 K5 is ready for chasing new [Re: Aquarellia]
      #5604903 - 01/04/13 02:19 PM

I have a few pictures from the 2nd but its moving so quickly that at 900mm fl and 20-30 second exposures its still trailing in my photos....just ever so slightly.

Weather looks good for me tonight so I am going to try autoguiding on the comet itself to get longer exposures.

Does anyone have suggestions for settings in Metaguide or PHD when guding on the comet? Are there any special settings I should be aware of?


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canukLX90
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Re: Comet C/2012 K5 is ready for chasing new [Re: tboss70]
      #5604959 - 01/04/13 02:48 PM

Thanks to everyone for posting their observations, photos,
and sketches of this comet. I observed / imaged the comet
on 29 December and 01 January. It really is moving quite
quickly being only 0.3 AU from earth according to SkyTools.

I guided on the comet for my images ( to be posted later )
using PHD. I used the TMB90 and DSI with 3 second sub
setting in PHD. This gave a SNR of 8 which was good enough
to track the comet while imaging with the main OTA.

Cheers

PJ


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tboss70
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Re: Comet C/2012 K5 is ready for chasing new [Re: canukLX90]
      #5605008 - 01/04/13 03:16 PM

Thanks PJ.

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canukLX90
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Re: Comet C/2012 K5 is ready for chasing new [Re: tboss70]
      #5605379 - 01/04/13 06:55 PM Attachment (44 downloads)

Here is a quick processed image of the comet taken the night
of 02 January. 6 X 2 minutes @ ISO 800 with 450D DSLR using
PowerNewt at F 2.8 and guiding on comet using the TMB92L,
DSI and PHD. Even a 30 second sub showed comet nucleus
stretching when not guiding on the comet.

PJ


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tboss70
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Re: Comet C/2012 K5 is ready for chasing new [Re: canukLX90]
      #5605479 - 01/04/13 07:59 PM

Nice one PJ. I tried to guide on the comet but I just couldnt find it with my 50mm finder and a SPC900 webcam. :-p

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Wino24
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Re: Comet C/2012 K5 is ready for chasing new [Re: tboss70]
      #5605793 - 01/04/13 11:50 PM

Hi all...I'm more of a lurker than a poster, but I feel compelled to post after seeing this comet. C/2012 K5 is the first comet I have ever seen in a telescope and I have to say...it was very impressive. I had tried to find a few weeks ago with my 4.5 Newt but had no luck. Santa brought me an Aperatura AD10 and tonight was the fist real opportunity I had to use it. Well the extra aperature sure made the difference. I was able to find it fairly easy...a faint fuzzy, but definitely observable. I was amazed to see just how fast it was moving. I couldn't stop watching it...amazing!! Anyone know what the magnitude of it is...Stellarium said 10.66 but I knwo those numbers can be wrong. The seeing was great tonight...I didn't want to back in it for the evening...saw many open clusters as well tonight...A great night for me tonight. Clear skies!

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Alan S
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Re: Comet C/2012 K5 is ready for chasing new [Re: Wino24]
      #5606303 - 01/05/13 10:48 AM

I observed and sketched this comet last night from my observatory- I am poor at estimating magnitudes but it seemed to be between 10 and 10.5. It is moving quickly to the southwest...

Report and sketch are on my blog The Lost Pleiad Observatory


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Rich (RLTYS)Moderator
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Re: Comet C/2012 K5 is ready for chasing new [Re: Alan S]
      #5606641 - 01/05/13 01:35 PM

I was also able to observe K5 Linear with my 10" refl, last evening. Despite light pollution and bright skies I was able to follow K5 Linear as it moved in a southerly direction. In the hour and 10 minutes I observed Linear it moved at least 1/4 degree, a fast moveing comet.

Rich (RLTYS)


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Dave Mitsky
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Re: Comet C/2012 K5 is ready for chasing new [Re: Rich (RLTYS)]
      #5606812 - 01/05/13 03:15 PM

I got back pretty late from the January DVAA meeting last night. (It's a long drive for me to King of Prussia.) With the upcoming moonrise, it was too late to go to the Naylor Observatory and I wasn't sure if the driveway was passable after the fairly recent snowfall anyway so I decided to see if I could spot Comet C/2012 K5 (LINEAR) from my light-polluted neighborhood through a Celestron Ultima 10x50 binocular. The comet passed just to the west and south of El Nath (Beta Tauri) last night.

http://cometchasing.skyhound.com/comets/2012_K5.pdf

http://www.virtualtelescope.eu/wordpress/wp-content/uploads/2013/01/C2012k5_f...

I walked down the street to a spot where some tall evergreens provide a bit of respite from the local houselights and began scanning the area around Beta Tauri. It was quite cold. I could easily see seventh-magnitude stars in the area but not the ninth-magnitude-or-so comet. While I was still in the shadow of the trees, I had a look at Jupiter, Collinder 70, the Hyades, Melotte 20, M34, M35, M36, M37, M38, M41, M42, M44, M45, M47, NGC 2244, and NGC 2264.

Later on, I gave the comet another go with my Burgess 15x70s. Even with the additional magnification and aperture, the results were the same.

By the way, the link to the image that I mentioned previously is working again.

http://www.cometpieces.at/images/phocagallery/2012k520121213lrgbweb_2.jpg

Dave Mitsky


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Re: Comet C/2012 K5 is ready for chasing new [Re: Dave Mitsky]
      #5607360 - 01/05/13 09:49 PM


Thanks for your map. I used it to locate the comet a few minutes ago. I wasn't going to drag out a scope tonight, but got to talking to a buddy in KY about it and the enthusiasm revived.

It's about 40 deg. outside, the ground is wet, and we have about the worst dewing conditions imaginable. But - it's clear and fairly transparent. (central Texas suburbs)

Brought out the 16" f/4.4 from 65 F inside to 40 outside. Heh, heh - yeah you guys know how it looked. Put in the 14mm Pentax and commenced scanning around. It was located quickly and I was surprised how bright it looked - thought it was gonna be dimmer. 10th mag? No official estimate, just a wild guess.(I am lucky to have approx. 6th mag stars at the zenith here)

Even without going to a higher mag (pointless with the rapidly cooling optics) the fuzz seemed to sport a tail - not long or sharp - more diffuse and broad and not very long either - maybe an arc minute total cometary length - think Jupiter worth of tail.

Here is the fun part: This comet is totally smoking along it's trail!! You can tell movement against the background stars in minutes. Major movement apparent in ten minutes.
Wow! I don't recall seeing a comet move so fast before. It's worth looking at this for that alone.

Have fun.


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Jure Atanackov
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Re: Comet C/2012 K5 is ready for chasing new [Re: siriusandthepup]
      #5607848 - 01/06/13 07:47 AM

I observed C/2012 K5 (LINEAR) last night from a local 900 m high hill under a so-so SQM 21.2 sky. Naked eye limiting magnitude in the area of comet was 6.9. The comet was obvious in 7x50 binoculars, with about 15' of tail visible. Rapid motion was obvious in minutes.

C/2012 K5 (LINEAR)

2013 Jan 05.87UT: m1=8.1 dia=5' DC=5 ...7x50B, Jure Atanackov (Grmada, Slovenia)[Tail 15' long. SQM21.2, NELM6.9 in the area of comet.]

CS!Jure


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Patricko
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Re: Comet C/2012 K5 is ready for chasing new [Re: Jure Atanackov]
      #5608093 - 01/06/13 11:12 AM

Hi everyone, I was able to re-observe this fast moving comet again last night at my intown location. My 4.5" Starblast reflector and 26mm Meade 4000 eyepiece allowed for it to be framed nicely in the same FOV as OC NGC 1746. I never realized until tonight what a beautiful cluster NGC 1746 really is and plan to revisit it.

C/2012 K5 at low power in the scope clearly showed the tail elongation. Upping the power to ~45x gave a much more contrasty view and exposed more "texture" variation. I felt as if I could almost see the comet moving with careful study. After putting the small reflector up I grabbed my 15x70mm binoculars and used them handheld to study the comet. Tonight the small 4.5" reflector showed the most detail at ~45x.

Conditions were cold and there was moisture in the atmosphere but even so the Merope Nebula in M45 was seen in both instruments. Not a bad night.


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Patricko
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Re: Comet C/2012 K5 is ready for chasing new [Re: Jure Atanackov]
      #5608098 - 01/06/13 11:13 AM

Good observation with just 7x50mm binoculars Jure. Your sky conditions that night sound like they were pretty awesome.

Clear skies,
Patrick


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John Wunderlin
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Re: Comet C/2012 K5 is ready for chasing new [Re: Patricko]
      #5610219 - 01/07/13 01:12 PM

Here is a video I made last night of the comet's motion over about an hour. Each frame is a 30 second exposure and this is 30 frames/second:

https://www.youtube.com/watch?v=ZG8E7Oo777g


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John Wunderlin
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Re: Comet C/2012 K5 is ready for chasing new [Re: John Wunderlin]
      #5610226 - 01/07/13 01:14 PM

For best viewing, set the quality to 'original' and view full screen. I should add- this was actually over 2 hours of data total, but the nucleus disappears from the screen after about an hour of data.

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Centaur
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Improved Comet & Asteroid Diagrams new [Re: Tonk]
      #5610380 - 01/07/13 02:53 PM

I’ve improved the graphics on both my comets and asteroids webpages for near-Earth objects (NEO). The overhead views from above the ecliptic plane now show the orbits colorized. This is to make it clearer when a minor body is “above” (north) or “below” (south) the ecliptic plane. Some of the bodies have orbits highly inclined to the ecliptic and the relationship between the two orbital planes needed to be made more obvious.

I hope you find the diagrams useful. They can be seen by going to my comets or asteroids webpages after clicking www.CurtRenz.com/astronomical or going directly to www.CurtRenz.com/comets or www.CurtRenz.com/asteroids


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Re: Improved Comet & Asteroid Diagrams new [Re: Centaur]
      #5610470 - 01/07/13 03:48 PM

John , that video is INCREDIBLE!



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John Wunderlin
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Re: Comet C/2012 K5 is ready for chasing new [Re: Scanning4Comets]
      #5610505 - 01/07/13 04:12 PM

Quote:

John , that video is INCREDIBLE!




Thanks, Marcus! I'm still working out the kinks in my processing steps, but I think it came out pretty well. I'm hoping to process the stack later today to get some details around the nucleus.

This was guided on a star because the comet is too faint for my 80mm guidescope and I didn't have time to swap my equipment around last night. I pre-processed all my raw frames with flats, darks and bias in DeepSkyStacker, then ran them through ImageMagick using a script I built in UltraEdit text editor in order to stretch the frames by the same amount. Then I brought all the frames into Cyberlink Power Director and set the frame length to .02 seconds and built the video to upload to youtube.

If anyone has a better workflow than this please share!


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ohioalfa64
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Re: Comet C/2012 K5 is ready for chasing new [Re: John Wunderlin]
      #5610586 - 01/07/13 05:03 PM

John,
That is very impressive work.


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Dave Mitsky
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Re: Comet C/2012 K5 is ready for chasing new [Re: ohioalfa64]
      #5610613 - 01/07/13 05:37 PM

I'll second that!

Dave Mitsky


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John Wunderlin
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Re: Comet C/2012 K5 is ready for chasing new [Re: Dave Mitsky]
      #5610861 - 01/07/13 08:27 PM Attachment (42 downloads)

Here's 120x30sec stacked. LX50 10" @ f/6.3

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Scanning4Comets
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Re: Comet C/2012 K5 is ready for chasing new [Re: John Wunderlin]
      #5610889 - 01/07/13 08:49 PM

That is sooooo nice! reminds me a bit of Hale Bopp!

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The Planetman
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Re: Comet C/2012 K5 is ready for chasing new [Re: Scanning4Comets]
      #5611059 - 01/07/13 10:33 PM Attachment (26 downloads)

Here is a quick sketch I did before high clouds and the moisture level started to rise.
Not the best, but it does give an idea of the size and shape.
Did this with the 18" and a 14mm Pentax XL.


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RobK
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Re: Improved Comet & Asteroid Diagrams new [Re: Centaur]
      #5611255 - 01/08/13 12:35 AM

Quote:

I’ve improved the graphics on both my comets and asteroids webpages for near-Earth objects (NEO). The overhead views from above the ecliptic plane now show the orbits colorized. This is to make it clearer when a minor body is “above” (north) or “below” (south) the ecliptic plane. Some of the bodies have orbits highly inclined to the ecliptic and the relationship between the two orbital planes needed to be made more obvious.

I hope you find the diagrams useful. They can be seen by going to my comets or asteroids webpages after clicking www.CurtRenz.com/astronomical or going directly to www.CurtRenz.com/comets or www.CurtRenz.com/asteroids




Wrong Curt. South is above the ecliptic plane. Just because a bunch of you decided to migrate downwards out of Africa aeons ago, it doesn't give you the right to change the natural orientation of things. Please rotate your diagrams 180 degrees.

Cheers -

Rob


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MessiToM
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Re: Improved Comet & Asteroid Diagrams new [Re: RobK]
      #5611331 - 01/08/13 02:44 AM

failed tonight. Blaming horrible transparency. Has it gotten more difficult though?

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canukLX90
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Re: Comet C/2012 K5 is ready for chasing new [Re: John Wunderlin]
      #5611928 - 01/08/13 01:13 PM

Nice image of the comet. Thanks for posting. Weather here
is back to cloud / rain so no chance on updating from here.

PJ


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Dave Mitsky
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Re: Improved Comet & Asteroid Diagrams new [Re: MessiToM]
      #5612063 - 01/08/13 02:26 PM

Quote:

failed tonight. Blaming horrible transparency. Has it gotten more difficult though?




The transparency and seeing were both very bad here last night too. I scanned the area repeatedly where the comet should have been with the ASH 17" f/15 classical Cassegrain at 162x and its 5" f/5 finder scope at 58x and simply couldn't locate it.

Dave Mitsky


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dan777
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Re: Improved Comet & Asteroid Diagrams new [Re: MessiToM]
      #5612194 - 01/08/13 03:40 PM

Quote:

failed tonight. Blaming horrible transparency. Has it gotten more difficult though?



I could just barely identify it; went back one hour later and could not see it at all. Weather forecast for tonight is clear but poor transparency (again).


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Re: Improved Comet & Asteroid Diagrams new [Re: dan777]
      #5612559 - 01/08/13 07:18 PM

Ditto - first "clear" sky for a week - however dew point quickly reached and the world fogged up. Next slot is Friday but thats only 50:50

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Re: Improved Comet & Asteroid Diagrams new [Re: Tonk]
      #5612619 - 01/08/13 07:59 PM

I just saw it. It is only 8pm est but I wanted to jump on the opportunity. The scope isnt even cooled down yet.

Its pretty dim. maybe 13ish. I am using my 17.5" newt. I could detect a very small fan tail much like "The Planetman" sketch above.


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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5612704 - 01/08/13 09:00 PM

Tonight around 23 hr CST (05 hr UT) the comet will pass 3.7° from Aldebaran as demonstrated in my chart below.



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Tonk
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Re: Comet C/2012 K5 is ready for chasing new [Re: Centaur]
      #5613368 - 01/09/13 09:20 AM

Quote:

Its pretty dim. maybe 13ish




It was 4 mags brighter than this late last week - thats a dramatic drop off if real


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thewheel
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5613627 - 01/09/13 12:22 PM

Viewed Comet C/2012 K5 last night in 10" dob and 80ED. Direct viewing in both.

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Alan S
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Re: Comet C/2012 K5 is ready for chasing new [Re: thewheel]
      #5614455 - 01/09/13 08:23 PM

Also viewed it last night in my TEC 140, visually...estimated magnitude of 11 to 11.5 but I am poor at these estimations.

Edited by Alan S (01/09/13 08:24 PM)


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MessiToM
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5615330 - 01/10/13 11:37 AM

Quote:

Quote:

Its pretty dim. maybe 13ish




It was 4 mags brighter than this late last week - thats a dramatic drop off if real




Tonk, Iam not the best magnitude guesser. Sorry I posted that number without clarifying


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John Wunderlin
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Re: Comet C/2012 K5 is ready for chasing new [Re: MessiToM]
      #5615346 - 01/10/13 11:47 AM

I haven't done comet mag estimating before, but I just brought up Stellarium and compared it against my video. I'm not sure how reliable Stellarium's Mag estimates are, but it looks to me to be closer to mag 10 or slightly brighter. You can check against my video by setting Stellarium's field of view to be Equatorial, Date of 1/6 time, 18:20 field of view to be .7 degrees. You can now see the star field matches the video quite closely. Then just click on surrounding stars which appear to be similar to the comet. Kind of fun, really.

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John Wunderlin
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Re: Comet C/2012 K5 is ready for chasing new [Re: John Wunderlin]
      #5615362 - 01/10/13 11:51 AM

Oops- time must match 00:20 1/7 UT. I forget that not everyone is in my central time zone

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Mike Phillips
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Re: Comet C/2012 K5 is ready for chasing new [Re: John Wunderlin]
      #5615624 - 01/10/13 02:20 PM

I caught a few subs for 30s a few nights back

https://picasaweb.google.com/108750361778865447048/20130108#5831092050561179522

Mike


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Rich (RLTYS)Moderator
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Re: Comet C/2012 K5 is ready for chasing new [Re: Mike Phillips]
      #5616724 - 01/11/13 06:15 AM

Great image.

Rich (RLTYS)


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SkyHound
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Re: Comet C/2012 K5 is ready for chasing new [Re: canukLX90]
      #5617963 - 01/11/13 08:33 PM

fastest moving Comet I've observed in along time...

http://www.flickr.com/photos/skyhounds_of_kankakee/8337400763/


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SkyHound
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Re: Comet C/2012 K5 is ready for chasing new [Re: SkyHound]
      #5617969 - 01/11/13 08:38 PM Attachment (34 downloads)

Heres a single image..

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SkyHound
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Re: Comet C/2012 K5 is ready for chasing new [Re: SkyHound]
      #5617975 - 01/11/13 08:40 PM Attachment (31 downloads)

Here is a 2 hour stack

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rgm40
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Re: Comet C/2012 K5 is ready for chasing new [Re: SkyHound]
      #5618148 - 01/11/13 10:36 PM

A nice sucker hole opened up tonight and I seized the opportunity to try and catch a glimpse of this jewel. After about 5 minutes of searching with no luck, the sucker hole was beginning to close. I could see the cloud bank getting closer to Orion. Tick Tock Tick Tock. As good luck and bad luck would have it, I found it about 20 seconds AFTER the cloud bank covered it up with a thin layer. The view would come and go but I never got a good clear look at it, although I could tell it was definitely a comet. I could see it even with the thin cloud layer and all. Better than nothing I guess. I hope I can get a good look at it before it's too late. Darn clouds.

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Special Ed
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Re: Comet C/2012 K5 is ready for chasing new [Re: rgm40]
      #5620059 - 01/13/13 12:18 AM Attachment (24 downloads)

Hi Everyone,

I've been off the boards for a month and when I looked at this thread there were 104 unread posts! Some great sketches, images, and observations which I just got caught up on.

My last observation of C/2012 K5 was November 22nd when it was in Bootes with almost daily solid cloud cover since then so when it cleared off the evening of the 7th (8th UT), I was anxious to get another look at the comet. By now it was in Taurus very near Aldebaran.

I was surprised how bright it was. My GoTo is a little off and put the comet core just outside the field of view but I could see the glow of the coma on the edge of the FOV.

The tail wasn't uniformly diffuse--it appeared to have streamers in it.

As others have noted, this is a fast mover--probably the fastest I have ever observed. I placed the comet just below the center of the FOV so I could include the tail in my sketch and in a half hour it had moved completely out of view.

@ Mike Phillips--you must have imaged the comet shortly after I sketched it. The starfield behind the comet trailing behind the tail to the left is the starfield in my sketch.

I'll tell you what people--it's getting crowded up there in space. A meteor went through my FOV during this observation followed shortly thereafter by a satellite.

Best to all,


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Tonk
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Re: Comet C/2012 K5 is ready for chasing new [Re: Special Ed]
      #5620184 - 01/13/13 04:53 AM

Continuing clouds in north central UK are still preventing me observing since 01/02 Jan 2013. I'm probably going to loose it now in the Leeds city (intense) glow to my south. So next up - 30 month PhD report and then ..... PANSTARRS ...

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canukLX90
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5623801 - 01/15/13 04:00 AM Attachment (19 downloads)

Sorry to hear that you are not getting any clear nights.
Not too many here either as it has been a warm cloudy and
wet winter in the PNW.

Here is a calibrated image stack of the comet taken
on 02 January. Unfortunately I forgot to take some
guided star field subs so the stars are trailing in this
stack. But it was nice to see that SH 2-235, a faint
nebula, was just in the frame which makes for a nice
contrast subject for the comet.

PJ


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John Wunderlin
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5623802 - 01/15/13 04:02 AM Attachment (19 downloads)

Another clear night with almost no moon tonight.

Here is a bit over 2 hours same procedure as earlier- 30 frames per second/30 second exposures. I had to stretch quite a bit more. Magnitude has dropped significantly.

https://www.youtube.com/watch?v=1WH6M2Q5b-k

Here is my stacked data.

Also captured some ISON tonight, but I'm ready for bed.


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Rich (RLTYS)Moderator
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Re: Comet C/2012 K5 is ready for chasing new [Re: John Wunderlin]
      #5623861 - 01/15/13 06:17 AM

Beautiful images. Thanks for the views.

Rich (RLTYS)


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MessiToM
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Re: Comet C/2012 K5 is ready for chasing new [Re: Rich (RLTYS)]
      #5624887 - 01/15/13 05:56 PM

neat vid John Wunderlin

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Re: Comet C/2012 K5 is ready for chasing new [Re: MessiToM]
      #5625229 - 01/15/13 09:28 PM

PJ, nice catch on the comet.

John, very cool video--the comet is really zipping along.

Tony, good luck winding up your PhD--we'll keep an eye on things for you while you are otherwise occupied.


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Re: Comet C/2012 K5 is ready for chasing new [Re: Special Ed]
      #5625288 - 01/15/13 10:03 PM

What cam was used?

Pete


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John Wunderlin
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Re: Comet C/2012 K5 is ready for chasing new [Re: azure1961p]
      #5625468 - 01/15/13 11:47 PM

Quote:

What cam was used?





ST8300M. Scope is 10" LX50 @ F/6.3 riding on Losmandy G11.


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canukLX90
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Re: Comet C/2012 K5 is ready for chasing new [Re: Special Ed]
      #5627375 - 01/17/13 02:48 AM Attachment (21 downloads)

Thanks for the appreciation Special Ed. I must say your
sketch is a very good observational capture of the comet.
Thanks for posting your effort for us to appreciate.

On 02 January SkyTools reported a comet motion of 12.9 arc
seconds per minute and on 10 Jan a motion of 6.34 arc
seconds per minute. It was really moving along!

Attached is probably my last image of the comet due to it
moving rapidly lower in altitude and the continual cloudy
night skies. It is 22 X 3 minutes guided on the comet taken
on the 10th of January.

Cheers

PJ


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Rich (RLTYS)Moderator
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Re: Comet C/2012 K5 is ready for chasing new [Re: canukLX90]
      #5627482 - 01/17/13 06:12 AM

Impressive image. K5's tail has a definite curve to it, thanks for the view.

Rich (RLTYS)


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John Wunderlin
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Re: Comet C/2012 K5 is ready for chasing new [Re: Rich (RLTYS)]
      #5627750 - 01/17/13 10:15 AM

Nice cap, PJ!

Edited by John Wunderlin (01/17/13 10:16 AM)


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canukLX90
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Re: Comet C/2012 K5 is ready for chasing new [Re: John Wunderlin]
      #5631585 - 01/19/13 01:32 PM

John / RLYTS thanks for the thumbs up on my latest image.

As this one heads out I guess it is on to the next one -
PANNSTARS then ISON. Hopefully their expected brightness
will give us more of a visual sky show !

Cheers

PJ


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Tonk
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Re: Comet C/2012 K5 is ready for chasing new [Re: canukLX90]
      #5631738 - 01/19/13 03:19 PM

Quote:

Hopefully their expected brightness will give us more of a visual sky show




Go to the PANSTARRS thread for latest brightness predictions and links to graphs - no longer a great comet candidate


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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5631970 - 01/19/13 06:03 PM

PJ,

Thanks for the compliment on my sketch. The latest images by you and John W are quite nice--that curving dust tail is something to see!

With Luna making her presence known and K5 fading, I guess I'm done with this comet--only two observations.


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Tonk
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Re: Comet C/2012 K5 is ready for chasing new [Re: Special Ed]
      #5632659 - 01/20/13 05:29 AM

Quote:

With Luna making her presence known and K5 fading, I guess I'm done with this comet--only two observations.




Short, very fast and sweet. I got in one observation since 1st Jan. Weather was the problem. But then again I did get some obs in back in October and November!


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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5683986 - 02/16/13 06:12 PM

Never too late I guess - but here is the image I got 1st Jan 2013. Click the image below to see details and click image again for a full screen version



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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5684230 - 02/16/13 08:58 PM

Hey,

Great shot, Tony. The fan tail is what most of us saw. It just blew through so fast that we didn't really get much of a chance to really look at it.


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Dave M
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Re: Comet C/2012 K5 is ready for chasing new [Re: Special Ed]
      #5684627 - 02/17/13 04:39 AM

Ide agree, thats a Great shot Tony. I wish i had attempted to image this one.

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Rich (RLTYS)Moderator
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5685677 - 02/17/13 06:17 PM

Tonk, a most impressive image. Thanks for the view.

Rich (RLTYS)


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nytecam
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Re: Comet C/2012 K5 is ready for chasing new [Re: Tonk]
      #5691494 - 02/20/13 06:32 PM Attachment (5 downloads)

Nice one Tony for Jan 1 My final brief shot last night Feb 19 very low in Eridinus under moonlight

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