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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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Reged: 12/21/09

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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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Loc: Leeds, UK, 54N
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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tboss70
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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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Tonk
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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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tboss70
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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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JoseBorrero
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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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Tonk
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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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tboss70
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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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Tonk
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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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tboss70
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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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Reged: 12/11/12

Loc: Michigan
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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tboss70
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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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