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Tom Polakis
Carpal Tunnel
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Reged: 12/20/04

Loc: Tempe, Arizona
Two Images of C/2012 S1 ISON new
      #5622015 - 01/14/13 01:06 AM

I am still working out many bugs in doing long, guided exposures using an inexpensive, permanent setup in my backyard in a white zone. The scope is an 8" f/8 ATRC on a CGE mount, with an ST-402ME camera.

Tonight I went after the "comet of the century," which is currently at a feeble magnitude 16.2. Here is an animation of two images, showing the motion of the fuzzy object. The frame is roughly 15' across.

Two images of C/2012 S1 ISON


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johnpd
sage


Reged: 04/13/08

Re: Two Images of C/2012 S1 ISON new [Re: Tom Polakis]
      #5622073 - 01/14/13 02:54 AM

Nice images Tom. How long were the exposures? Did you use a LP filter? I am surprised you could get images like that in the Phoenix area.

JohnD


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Tonk
Postmaster
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Reged: 08/19/04

Loc: Leeds, UK, 54N
Re: Two Images of C/2012 S1 ISON new [Re: johnpd]
      #5622100 - 01/14/13 04:39 AM

Quote:

"comet of the century,"




.. lets hope it dosen't become the "Kohoutek" of this century!


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Tom Polakis
Carpal Tunnel
*****

Reged: 12/20/04

Loc: Tempe, Arizona
Re: Two Images of C/2012 S1 ISON new [Re: johnpd]
      #5622304 - 01/14/13 09:15 AM

Quote:

Nice images Tom. How long were the exposures? Did you use a LP filter? I am surprised you could get images like that in the Phoenix area.




I used 5 minutes of integration time at f/8. That puts the sky background at roughly 10,000 counts (out of 65,000). The system can reach V magnitude 18, and maybe 19 with some additional finesse.

Tom


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John Wunderlin
Vendor - Spike-a Focusing Mask
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Reged: 10/01/04

Loc: Mineral Point, Wi
Re: Two Images of C/2012 S1 ISON new [Re: Tom Polakis]
      #5622536 - 01/14/13 11:50 AM

Nice catch! I'm going to give this a try tonight.

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canukLX90
professor emeritus


Reged: 12/25/08

Loc: B.C. Canada
Re: Two Images of C/2012 S1 ISON new [Re: John Wunderlin]
      #5623807 - 01/15/13 04:04 AM

ditto the "nice catch" comment. Thanks for posting.
Oh I so hope the weather is going to be nice to us fuzz
ball chasers this year!

PJ


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Rich (RLTYS)Moderator
Postmaster
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Reged: 12/18/04

Loc: New York (Long Island)
Re: Two Images of C/2012 S1 ISON new [Re: Tom Polakis]
      #5623860 - 01/15/13 06:12 AM Attachment (25 downloads)

Tom, excellent images. Here's my image of Ison taken the day before (1/13).

Rich (RLTYS)


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Special Ed
Postmaster
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Reged: 05/18/03

Loc: Greenbrier Co., WV 38N, 80W
Re: Two Images of C/2012 S1 ISON new [Re: Rich (RLTYS)]
      #5625243 - 01/15/13 09:37 PM

Tom and Rich--nice shots. You guys are reaching way out there for this little chunk of dirt and ice. I read that ISON is still out around the orbit of Jupiter.

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Mike Phillips
Post Laureate
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Reged: 02/21/06

Loc: Swift Creek, NC - 35.682 N, 78...
Re: Two Images of C/2012 S1 ISON new [Re: Tonk]
      #5626375 - 01/16/13 03:15 PM

Quote:

Quote:

"comet of the century,"




.. lets hope it dosen't become the "Kohoutek" of this century!




I had to look that one up Tonk. Don't be such a naysayer. Daytime comet, perhaps not, but I hold out hope. Last I looked MPC estimated it was going to -8mag!

Fingers crossed!

Great shots Tom!

Mike


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SabiaJD
scholastic sledgehammer


Reged: 02/20/05

Loc: Clarks Summit, PA
Re: Two Images of C/2012 S1 ISON new [Re: Mike Phillips]
      #5626445 - 01/16/13 03:55 PM Attachment (15 downloads)

A little late in posting, take on Jan 8 2013 UT

Edited by SabiaJD (01/16/13 03:56 PM)


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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: Two Images of C/2012 S1 ISON new [Re: SabiaJD]
      #5626808 - 01/16/13 07:04 PM Attachment (15 downloads)

My 1st image below of ISON tonight immediately south of Castor and it appears slightly fuzzy compared to field stars. From my pic I'd estimated as ~m16.2 by comparison to Sloan DSS with faintest star recorded ~m18.3 - even 30s exp clearly showed the comet

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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: Two Images of C/2012 S1 ISON new [Re: nytecam]
      #5626826 - 01/16/13 07:23 PM Attachment (13 downloads)

here's comet in 30s exp Video clip here

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Tonk
Postmaster
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Reged: 08/19/04

Loc: Leeds, UK, 54N
Re: Two Images of C/2012 S1 ISON new [Re: nytecam]
      #5627478 - 01/17/13 06:05 AM

I'm not naysaying - just thets its far too premature to accept the current brightness predictions,

- but as John Bortle is always pointing out extrapolating the comets brightness trend from so far out always ends up wrong. Thats whats happened with the Kohoutec hype and we should learn from that. Comets are dynamic and there are set points in its orbit when volatiles (if present) kick off. One of these points is rougly around 1.5 AU when some common volatiles get warm enough to start creating a coma and aiding the release of dust.

When the comet get this close then it is time to take note of of more reliable brightness predictions - but still being aware that "new" comets also have a habit of premature break up (Elenin anyone).

I'll get properly excited when the milestones are passed - not before


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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: Two Images of C/2012 S1 ISON [Re: Tonk]
      #5627744 - 01/17/13 10:13 AM

Tony - cometeers are not fooled by the hype but it does keep the astro-pot boiling and apparently there's no such thing as bad publicity

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