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Pages: 1 Tom Polakis Pooh-Bah Reged: 12/20/04 Loc: Tempe, Arizona Two Images of C/2012 S1 ISON       #5622015 - 01/14/13 01:06 AM Edit   Reply   Quote Quick Reply   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 Post Extras:       johnpd sage Reged: 04/13/08 Re: Two Images of C/2012 S1 ISON [Re: Tom Polakis]       #5622073 - 01/14/13 02:54 AM Edit   Reply   Quote Quick Reply   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 Post Extras:       Tonk Postmaster Reged: 08/19/04 Loc: Leeds, UK, 54N Re: Two Images of C/2012 S1 ISON [Re: johnpd]       #5622100 - 01/14/13 04:39 AM Edit   Reply   Quote Quick Reply   Quote: "comet of the century," .. lets hope it dosen't become the "Kohoutek" of this century! Post Extras:       Tom Polakis Pooh-Bah Reged: 12/20/04 Loc: Tempe, Arizona Re: Two Images of C/2012 S1 ISON [Re: johnpd]       #5622304 - 01/14/13 09:15 AM Edit   Reply   Quote Quick Reply   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 Post Extras:       John Wunderlin Vendor - Spike-a Focusing Mask Reged: 10/01/04 Loc: Mineral Point, Wi Re: Two Images of C/2012 S1 ISON [Re: Tom Polakis]       #5622536 - 01/14/13 11:50 AM Edit   Reply   Quote Quick Reply   Nice catch! I'm going to give this a try tonight. Post Extras:       canukLX90 sage Reged: 12/25/08 Loc: B.C. Canada Re: Two Images of C/2012 S1 ISON [Re: John Wunderlin]       #5623807 - 01/15/13 04:04 AM Edit   Reply   Quote Quick Reply   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 Post Extras:       RLTYS Post Laureate Reged: 12/18/04 Loc: New York (Long Island) Re: Two Images of C/2012 S1 ISON [Re: Tom Polakis]       #5623860 - 01/15/13 06:12 AM Attachment (24 downloads) Edit   Reply   Quote Quick Reply   Tom, excellent images. Here's my image of Ison taken the day before (1/13). Rich (RLTYS) Post Extras:       Special Ed Postmaster Reged: 05/18/03 Loc: Greenbrier Co., WV 38N, 80W Re: Two Images of C/2012 S1 ISON [Re: RLTYS]       #5625243 - 01/15/13 09:37 PM Edit   Reply   Quote Quick Reply   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. Post Extras:       Mike Phillips Carpal Tunnel Reged: 02/21/06 Loc: Swift Creek, NC - 35.682 N, 78... Re: Two Images of C/2012 S1 ISON [Re: Tonk]       #5626375 - 01/16/13 03:15 PM Edit   Reply   Quote Quick Reply   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 Post Extras:       SabiaJD professor emeritus Reged: 02/20/05 Loc: Clarks Summit, PA Re: Two Images of C/2012 S1 ISON [Re: Mike Phillips]       #5626445 - 01/16/13 03:55 PM Attachment (14 downloads) Edit   Reply   Quote Quick Reply   A little late in posting, take on Jan 8 2013 UT Edited by SabiaJD (01/16/13 03:56 PM) Post Extras:       nytecam Postmaster Reged: 08/20/05 Loc: London UK Re: Two Images of C/2012 S1 ISON [Re: SabiaJD]       #5626808 - 01/16/13 07:04 PM Attachment (14 downloads) Edit   Reply   Quote Quick Reply   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 Post Extras:       nytecam Postmaster Reged: 08/20/05 Loc: London UK Re: Two Images of C/2012 S1 ISON [Re: nytecam]       #5626826 - 01/16/13 07:23 PM Attachment (12 downloads) Edit   Reply   Quote Quick Reply   here's comet in 30s exp Video clip here Post Extras:       Tonk Postmaster Reged: 08/19/04 Loc: Leeds, UK, 54N Re: Two Images of C/2012 S1 ISON [Re: nytecam]       #5627478 - 01/17/13 06:05 AM Edit   Reply   Quote Quick Reply   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 Post Extras:       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 Edit   Reply   Quote Quick Reply   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 Post Extras:       Pages: 1

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