Welcome to DU!
The truly grassroots left-of-center political community where regular people, not algorithms, drive the discussions and set the standards.
Join the community:
Create a free account
Support DU (and get rid of ads!):
Become a Star Member
Latest Breaking News
General Discussion
The DU Lounge
All Forums
Issue Forums
Culture Forums
Alliance Forums
Region Forums
Support Forums
Help & Search
Science
Related: About this forumIt is looking grim for Comet ISON - naked eye views not likely - two good info sources
http://www.skyandtelescope.com/observing/highlights/193909261.html"November 30, 9 a.m. EST: Fading continues; no activity. Filip Fratev posts again (at 8:15 UT this morning), "just measured another drop of 0.5 magnitude for the last 11 hours (20:30 7:18 UT). Thus it is in the range of magnitude 3.13.6, probably more close to 3.5." The later LASCO C3 image from 12:54 UT shows the fading very obviously.
Jacob Czerny notes that the comet remnant is fading at the rate expected of a simple, inactive debris cloud moving farther from the Sun's illumination. In addition, it is expanding, which means its surface brightness is dimming even faster than its total brightness.
As for what looks like a new comet tail? That turns out to be well modeled by the trajectories of particles that ceased to be emitted at perihelion two days ago. Explains Hermann Böhnhardt (Max Planck Institute for Solar System Research), "If we assume in our calculations that the comet has emitted dust at perihelion, we can reproduce the current images quite well."
snip
"It does seem unlikely that there will be much to see in the night sky. I suspect that some of the outstanding astrophotographers around the world will be able to get something, but I doubt it will be as spectacular as before perihelion. I hope I'm wrong though."
and from http://www.isoncampaign.org/karl/a-trail-of-questions
In ISON's Wake, a Trail of Questions
Submitted by Karl Battams on Fri, 11/29/2013 - 23:18
I always find that writing the first line in a blog post is the hardest, and this has never been truer that now as I struggle to decide where I should even begin. My @SungrazerComets Twitter feed, and my email accounts, are all blowing up with questions about comet ISON. Many of them have already been answered, and many of them have unsatisfying answers, but I'll do my best. First, a little personal note...
All of us in the CIOC have been overwhelmed by the positive feedback we have received from the public through both our website, and our emails and, for me, my Twitter feed. I truly wish I could respond to every message, but I simply can't, so instead say to every single one of you who have sent us messages of support, encouragement and thanks, or simply visited out site and read our thoughts and information... we THANK YOU! Truly and sincerely! Astronomy and science is our passion, and we are simply delighted and honored to have had such a broad and receptive audience to share that passion with. On the past couple of nights, as exhaustion has started to get the better of me, the supportive messages have definitely kept me going. [*sniffle*]
OK, back to more serious but still awesome stuff, and before I get to those questions I hinted at earlier, I should probably share with you a couple of new movies!
I'm sure you've all seen the LASCO movies by now - everyone is talking about them. But these movies are from STEREO and are pretty fresh, as we only just got back the high-resolution data. WARNING: These are big animated gif and might take a minute to load... please be patient as they're totally worth it! "
snip
well worth reading both, for astronomy buffs.
InfoView thread info, including edit history
TrashPut this thread in your Trash Can (My DU » Trash Can)
BookmarkAdd this thread to your Bookmarks (My DU » Bookmarks)
0 replies, 1021 views
ShareGet links to this post and/or share on social media
AlertAlert this post for a rule violation
PowersThere are no powers you can use on this post
EditCannot edit other people's posts
ReplyReply to this post
EditCannot edit other people's posts
Rec (3)
ReplyReply to this post