Jump to content


Photo

Comet C/2012 K5 is ready for chasing

  • Please log in to reply
145 replies to this topic

#26 OldDeadOne

OldDeadOne

    Apollo

  • *****
  • Posts: 1331
  • Joined: 09 Sep 2006
  • Loc: West Virginia

Posted 13 December 2012 - 07:23 PM

bright enough for binoculars yet?

#27 Rich (RLTYS)

Rich (RLTYS)

    Fly Me to the Moon

  • *****
  • Moderators
  • Posts: 5299
  • Joined: 18 Dec 2004
  • Loc: New York (Long Island)

Posted 20 December 2012 - 08:24 AM

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

Rich (RLTYS)

Attached Files



#28 MessiToM

MessiToM

    Viking 1

  • *****
  • Posts: 886
  • Joined: 21 Dec 2009
  • Loc: Huntingdon PA

Posted 20 December 2012 - 01:14 PM

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

#29 Bill Whitehead

Bill Whitehead

    Mariner 2

  • *****
  • Posts: 254
  • Joined: 11 Jul 2009
  • Loc: Exit 135 - Garden St Parkway

Posted 20 December 2012 - 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

#30 Tonk

Tonk

    Fly Me to the Moon

  • *****
  • Posts: 7141
  • Joined: 19 Aug 2004
  • Loc: Leeds, UK, 54N

Posted 20 December 2012 - 06:03 PM

It must be pretty diffuse


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

#31 Centaur

Centaur

    member

  • *****
  • Posts: 2602
  • Joined: 12 Jul 2004
  • Loc: Chicago

Posted 20 December 2012 - 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.

#32 Coy

Coy

    Vostok 1

  • -----
  • Posts: 188
  • Joined: 03 Feb 2012
  • Loc: Shreveport, Louisiana

Posted 21 December 2012 - 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.

#33 CosmoSat

CosmoSat

    Apollo

  • -----
  • Posts: 1273
  • Joined: 24 Jul 2009
  • Loc: India

Posted 21 December 2012 - 01:34 PM

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!

Attached Files



#34 Achernar

Achernar

    Cosmos

  • *****
  • Posts: 9163
  • Joined: 25 Feb 2006
  • Loc: Mobile, Alabama, USA

Posted 22 December 2012 - 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

#35 SteelStar

SteelStar

    Vostok 1

  • -----
  • Posts: 134
  • Joined: 08 Nov 2009
  • Loc: Oklahoma

Posted 22 December 2012 - 03:07 PM

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.

Attached Files



#36 Scanning4Comets

Scanning4Comets

    Markus

  • *****
  • Posts: 13901
  • Joined: 26 Dec 2004
  • Loc: Canada

Posted 22 December 2012 - 11:26 PM

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

#37 CosmoSat

CosmoSat

    Apollo

  • -----
  • Posts: 1273
  • Joined: 24 Jul 2009
  • Loc: India

Posted 23 December 2012 - 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!

#38 tboss70

tboss70

    Mercury-Atlas

  • *****
  • Posts: 2619
  • Joined: 25 Nov 2005
  • Loc: Missouri

Posted 23 December 2012 - 02:08 AM

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

Attached Files



#39 dan777

dan777

    Viking 1

  • *****
  • Posts: 802
  • Joined: 16 Nov 2007
  • Loc: Indiana

Posted 23 December 2012 - 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.

#40 Ira

Ira

    Mercury-Atlas

  • *****
  • Posts: 2655
  • Joined: 22 Aug 2010
  • Loc: Mitzpe Ramon, Israel

Posted 23 December 2012 - 10:36 AM

Any links to daily coordinates?

/Ira

#41 dan777

dan777

    Viking 1

  • *****
  • Posts: 802
  • Joined: 16 Nov 2007
  • Loc: Indiana

Posted 23 December 2012 - 10:59 AM

Any links to daily coordinates?


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

#42 tboss70

tboss70

    Mercury-Atlas

  • *****
  • Posts: 2619
  • Joined: 25 Nov 2005
  • Loc: Missouri

Posted 23 December 2012 - 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?

#43 Centaur

Centaur

    member

  • *****
  • Posts: 2602
  • Joined: 12 Jul 2004
  • Loc: Chicago

Posted 23 December 2012 - 12:48 PM

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.

#44 Tonk

Tonk

    Fly Me to the Moon

  • *****
  • Posts: 7141
  • Joined: 19 Aug 2004
  • Loc: Leeds, UK, 54N

Posted 23 December 2012 - 06:32 PM

Any links to daily coordinates?


Yes lots - the Harvard / MPC ephemeris is best

MPC ephemeris

BAA ephemeris

"Astrosite" charts

Skyhound charts



#45 Ira

Ira

    Mercury-Atlas

  • *****
  • Posts: 2655
  • Joined: 22 Aug 2010
  • Loc: Mitzpe Ramon, Israel

Posted 23 December 2012 - 08:24 PM

Thanks! :)

/Ira

#46 Centaur

Centaur

    member

  • *****
  • Posts: 2602
  • Joined: 12 Jul 2004
  • Loc: Chicago

Posted 23 December 2012 - 11:41 PM

Thanks! :)

/Ira


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

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.chemistr...~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.cloudynig...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

#47 Dave Mitsky

Dave Mitsky

    ISS

  • *****
  • Moderators
  • Posts: 36831
  • Joined: 08 Apr 2002
  • Loc: PA, USA, Planet Earth

Posted 24 December 2012 - 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

#48 MessiToM

MessiToM

    Viking 1

  • *****
  • Posts: 886
  • Joined: 21 Dec 2009
  • Loc: Huntingdon PA

Posted 24 December 2012 - 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

#49 Bagleys

Bagleys

    Lift Off

  • -----
  • Posts: 8
  • Joined: 27 Sep 2010
  • Loc: Lake St. Louis, Missouri

Posted 24 December 2012 - 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.

#50 MessiToM

MessiToM

    Viking 1

  • *****
  • Posts: 886
  • Joined: 21 Dec 2009
  • Loc: Huntingdon PA

Posted 24 December 2012 - 01:13 PM

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






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics