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Pages: 1 | 2 | 3 | 4 | (show all) Tonk Postmaster Reged: 08/19/04 Loc: Leeds, UK, 54N Re: C/2012 S1 ISON [Re: John Wunderlin]       #5677561 - 02/13/13 12:00 PM Edit   Reply   Quote Quick Reply   Quote: I tried to calculate magnitude and got 16.0 tonight so I don't think my process is right- it shouldn't be getting dimmer. It *is* getting dimmer. There are numerous reports that its dropped 0.5 to 0.8 mags in the last 3 nights. One idea - yet to be confirmed - is that it is at a small phase angle at present and the phase angle is is now slowly increasing. This could indicate that the comet has been "unnaturally" bright due to back scattered light off dust particals and the comet is actually returning to its "natural" brightness as back scatter diminishes Post Extras:       John Wunderlin Vendor - Spike-a Focusing Mask Reged: 10/01/04 Loc: Mineral Point, Wi Re: C/2012 S1 ISON [Re: Tonk]       #5677567 - 02/13/13 12:03 PM Edit   Reply   Quote Quick Reply   Excellent! I was hopeful that I could track the magnitude over time, but thought I must be doing something wrong. Thanks much! Post Extras:       Special Ed Postmaster Reged: 05/18/03 Loc: Greenbrier Co., WV 38N, 80W Re: C/2012 S1 ISON [Re: John Wunderlin]       #5678323 - 02/13/13 08:40 PM Edit   Reply   Quote Quick Reply   John & Rich--your images of this very dim comet still out around the orbit of Jupiter (~4 AU) are impressive. Keep up the good work--maybe I'm a weenie but I'm not even going to look visually for this intruder from the Oort Belt until it get closer in. In the meantime thanks for the updates. Post Extras:       canukLX90 sage Reged: 12/25/08 Loc: B.C. Canada Re: C/2012 S1 ISON [Re: John Wunderlin]       #5678705 - 02/14/13 02:05 AM Edit   Reply   Quote Quick Reply   John, Rich: thanks for posting your imaging efforts. This is a challenging chase with this fuzz ball being so far out. PJ Post Extras:       hiro scholastic sledgehammer Reged: 07/17/07 Loc: Tokyo Re: C/2012 S1 ISON [Re: canukLX90]       #5697714 - 02/24/13 02:20 AM Edit   Reply   Quote Quick Reply   Hi all, Sky was clear and dark for a while on February 9, 10, 11, and 13, 2013, though the seeing was bad due to the strong jet stream here in this season. I tried imaging of the comet with my small scope, Takahashi FSQ-106ED and extender Q1.6x at D106/F850. I could get 119 frames of the comet, exposure for 6 minutes, about 12 hours in total. The image of the comet looked tiny, and I scaled it up by 5 times with IRIS hoping that the number may be some help. Here is the result. http://www.flickr.com/photos/hiroc/8501810109/ Edited by hiro (02/24/13 02:35 AM) Post Extras:       Tonk Postmaster Reged: 08/19/04 Loc: Leeds, UK, 54N Re: C/2012 S1 ISON [Re: hiro]       #5697828 - 02/24/13 06:17 AM Edit   Reply   Quote Quick Reply   Whoa - thats some effort Hiro! Nice result Post Extras:       hiro scholastic sledgehammer Reged: 07/17/07 Loc: Tokyo Re: C/2012 S1 ISON [Re: Tonk]       #5697862 - 02/24/13 08:03 AM Edit   Reply   Quote Quick Reply   Thanks Tonk, I planned to try dithering technique with drizzle command of IRIS, but I could not do it this time. Here is a command list of IRIS and link to dithering technique. http://www.astrosurf.com/buil/iris/nav_pane/CommandsFrame.html Edited by hiro (02/26/13 07:20 PM) Post Extras:       John Wunderlin Vendor - Spike-a Focusing Mask Reged: 10/01/04 Loc: Mineral Point, Wi Re: C/2012 S1 ISON [Re: hiro]       #5709312 - 03/02/13 06:30 PM Attachment (21 downloads) Edit   Reply   Quote Quick Reply   Here's my data from last night. I'll try to calculate the magnitude later today if I have time. This was 18x5min bin 1x1. 10" LX50 @ f/6.3, ST8300. Edited by John Wunderlin (03/02/13 06:31 PM) Post Extras:       John Wunderlin Vendor - Spike-a Focusing Mask Reged: 10/01/04 Loc: Mineral Point, Wi Re: C/2012 S1 ISON [Re: John Wunderlin]       #5709420 - 03/02/13 07:32 PM Edit   Reply   Quote Quick Reply   Magnitude 15.4 Post Extras:       hiro scholastic sledgehammer Reged: 07/17/07 Loc: Tokyo Re: C/2012 S1 ISON [Re: John Wunderlin]       #5710043 - 03/03/13 07:25 AM Edit   Reply   Quote Quick Reply   Hi, C/2012 S1 ISON on February 10, 2013 again. I have updated the image, scaled up x5 earlier, and it got a little more precise. Here is the original. http://www.flickr.com/photos/hiroc/8523305073/ Thanks. Edited by hiro (03/03/13 07:47 AM) Post Extras:       canukLX90 sage Reged: 12/25/08 Loc: B.C. Canada Re: C/2012 S1 ISON [Re: hiro]       #5723357 - 03/10/13 04:23 AM Attachment (35 downloads) Edit   Reply   Quote Quick Reply   Very nice effort. Thanks for posting. There was a clear night here, finally, and I managed to image the comet. Attached is 5 X 3 minutes at ISO 800. The object marked at mag 17.5 is a galaxy. The comet is still over 4 AU from the earth and the sun and is moving at around 19 arcsec / hour. PJ Post Extras:       canukLX90 sage Reged: 12/25/08 Loc: B.C. Canada Re: C/2012 S1 ISON [Re: canukLX90]       #5723359 - 03/10/13 04:27 AM Attachment (30 downloads) Edit   Reply   Quote Quick Reply   Attached is a crop resized to show a bit more detail. For this image stack I used the comet versus the stars. The tail seems quite broad to me with a well defined nucleus. PJ Post Extras:       buddyjesus Carpal Tunnel Reged: 07/07/10 Loc: Davison, Michigan Re: C/2012 S1 ISON [Re: canukLX90]       #5724282 - 03/10/13 04:54 PM Edit   Reply   Quote Quick Reply   now those pics are going deep. gj Post Extras:       John Wunderlin Vendor - Spike-a Focusing Mask Reged: 10/01/04 Loc: Mineral Point, Wi Re: C/2012 S1 ISON [Re: buddyjesus]       #5724546 - 03/10/13 07:23 PM Edit   Reply   Quote Quick Reply   Looking good guys! I'm clouded out for a few days. I hope I get a chance to see Panstarrs too. Post Extras:       AXAF sage Reged: 09/15/04 Loc: New England Re: C/2012 S1 ISON [Re: John Wunderlin]       #5731647 - 03/14/13 05:31 AM Attachment (32 downloads) Edit   Reply   Quote Quick Reply   Here is my most recent image of Comet ISON, taken on 3/14/13 at 04:30UT. It is a 20 minute exposure using a 0.50-m f/6.8 astrograph and a FLI ProLine PL11002M CCD camera. Post Extras:       Jure Atanackov member Reged: 05/04/10 Re: C/2012 S1 ISON [Re: AXAF]       #5732094 - 03/14/13 11:41 AM Edit   Reply   Quote Quick Reply   I'm beginning to wonder if the early expectations of comet ISON becoming as spectacular as the Great comet of 1680 (some even compared it with the Great september comet of 1882…) were just a bit too optimistic. At this time the comet isn't looking intrinsically very bright. Right now it's about magnitude 15. Its heliocentric magnitude is ~12.0. At the same heliocentric distance (4.5 a.u.), comet PanSTARRS was 1-1.5 magnitudes brighter. Similar to comet PanSTARRS, ISON also appears dynamically new. I can’t help but wonder if ISON will follow PanSTARRS’ photometric development, but perhaps a magnitude or so fainter. Maybe H0~6.5 or so and n~3. On a more positive note, the comet appears quite dusty – its morphology is actually quite similar to comet PanSTARRS at the same heliocentric distance. It has a small, compact coma and a developing dust tail. A very dusty nature of the comet would also explain the brightness bump around opposition, when its brightness would have been increased by backscattering. At H0~6.5 the comet would still be above the Bortle survival limit and still at least 4 magnitudes brighter than comet Lovejoy. So its perihelion survival probably isn’t questionable, but I really wonder if it will become as bright and spectacular as first expected... CS!Jure Post Extras:       OldDeadOne Pooh-Bah Reged: 09/09/06 Loc: West Virginia Re: C/2012 S1 ISON [Re: Jure Atanackov]       #5732607 - 03/14/13 05:30 PM Edit   Reply   Quote Quick Reply   All we can do is hope that it is spectacular when it is viewable this fall,I know I am I want a nice naked eye with a nice tail comet winking it's eye at me. Post Extras:       Tonk Postmaster Reged: 08/19/04 Loc: Leeds, UK, 54N Re: C/2012 S1 ISON [Re: Jure Atanackov]       #5732661 - 03/14/13 06:04 PM Edit   Reply   Quote Quick Reply   I think you might well be right - those concerns have been expressed on Comets-ML Post Extras:       aa6ww sage Reged: 10/23/11 Loc: Sacramento, Calif. Re: C/2012 S1 ISON [Re: Tonk]       #5740043 - 03/18/13 03:15 AM Edit   Reply   Quote Quick Reply   I'm looking forward to tracking comet ISON as soon as its observable in my C14. Comets are my favorite objects to track, its the one thing I like to look for every time theres a new moon and I'm out with my largest scope.. ...Ralph Post Extras:       BrooksObs super member Reged: 12/08/12 Re: C/2012 S1 ISON [Re: aa6ww]       #5740347 - 03/18/13 09:54 AM Edit   Reply   Quote Quick Reply   I share Jure's concerns about the actual potential for Comet ISON to become a truly spectacular object, at least in the eyes of the average amateur astronomer and likewise the general public. I have little current doubt that it will do at least as well as did Comet Lovejoy last year. However, one must keep in mind that for nearly all its southern observers and the astrophotographers they saw it largely under very dark sky conditions, a situation unlikely to prevail for the average northern hemisphere observer. For objects like Comet ISON, what is actually seen and the degree of spectacle presented is often highly dependent of the clarity and sky darkness enjoyed by the observers...especially once the comet is a couple of weeks, or more, past perihelion and finally well placed in the sky. BrooksObs Edited by BrooksObs (03/18/13 09:57 AM) Post Extras:       Pages: 1 | 2 | 3 | 4 | (show all)

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