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Relativist
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Re: Comet ISON - Cooked well done? new [Re: Crusader]
      #6221848 - 11/28/13 04:14 PM

Quote:

I'll be damned! Strange that they didn't pick up anything on SDO.




Wouldn't it be awesome of it were a pointing error...


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cnargie
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Re: Comet ISON - Cooked well done? new [Re: Relativist]
      #6221854 - 11/28/13 04:15 PM

From what I have been reading the newest theory is that part of the tail has survived but without a nucleus.

https://twitter.com/esascience/status/406167822130094081/photo/1


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Tonk
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Re: Comet ISON - Cooked well done? new [Re: krp]
      #6221856 - 11/28/13 04:16 PM

Quote:

I thought it was predicted to make a tighter loop around the sun. I guess I was wrong.




Given that the graphics matches what we are seeing ... whats wrong?


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SteveRosenow
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Re: Comet ISON - Cooked well done? new [Re: cnargie]
      #6221859 - 11/28/13 04:16 PM

Quote:

From what I have been reading the newest theory is that part of the tail has survived but without a nucleus.

https://twitter.com/esascience/status/406167822130094081/photo/1




I don't think you can have a tail without a nucleus.


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Starhunter249
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Reged: 06/07/10

Re: Comet ISON - Cooked well done? new [Re: Relativist]
      #6221861 - 11/28/13 04:17 PM

According an image and a NASA scientist's comment that I had viewed, it appears comet ISON survived or a smaller remnant of it did.

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Ptarmigan
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Re: Comet ISON - Cooked well done? new [Re: Starhunter249]
      #6221862 - 11/28/13 04:19 PM

Quote:

According an image and a NASA scientist's comment that I had viewed, it appears comet ISON survived or a smaller remnant of it did.




If a smaller part survived, I wonder how bright would it be.


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Tonk
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Re: Comet ISON - Cooked well done? new [Re: SteveRosenow]
      #6221863 - 11/28/13 04:20 PM

Quote:

don't think you can have a tail without a nucleus.




Yes you can!!! - numerous historical comets went headless. Last one was 2 years ago - Comet Lovejoy. The tail lasted 3 weeks without a nucleus - just faded away. Remember the dust tail is a mixture of rubble down to talcum power sized stuff. The larger bits just follow the predicted orbit, while the lighter stuff gets deflected by solar wind and photon pressure


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margin_walker
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Re: Comet ISON - Cooked well done? new [Re: Tonk]
      #6221870 - 11/28/13 04:21 PM

Latest NASA tweet: "It appears that #ISON is more than mostly dead, but we are still looking in the @NASA_SDO images"

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Mirzam
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Re: Comet ISON - Cooked well done? new [Re: Starhunter249]
      #6221871 - 11/28/13 04:22 PM

I agree that this is very enjoyable to look at the data as it comes in and draw our own conclusions independently from the talking heads. Even if the comet only survives in a weakened state it is great fun to observe it in realtime.

JimC


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krp
Vendor. DarkSiteFinder.com


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Re: Comet ISON - Cooked well done? new [Re: Tonk]
      #6221874 - 11/28/13 04:22 PM

Quote:

Quote:

I thought it was predicted to make a tighter loop around the sun. I guess I was wrong.




Given that the graphics matches what we are seeing ... whats wrong?



The orbit's just different than what I had pictured in my head

I can't believe so many people called it before it was over.


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MessiToM
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Re: Comet ISON - Cooked well done? new [Re: Michael Rapp]
      #6221875 - 11/28/13 04:22 PM

Quote:

Whether ISON survives or not, I just can't get over the notion that a bunch of amateur astronomers from all over the world are watching a comet survive/not-survive a close encounter with a star in real time!




aint it cool!


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Relativist
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Re: Comet ISON - Cooked well done? new [Re: Ptarmigan]
      #6221876 - 11/28/13 04:23 PM

The tail is what the nucleus leaves behind. With no nucleus there is no tail.

Well at least something unexpected occurred. The fact that SDO couldn't see it will need to be explained. I for one hope that it survived mostly intact now, since a smaller fragment wouldn't put as good of a show potentially.


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djeber2
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Re: Comet ISON - Cooked well done? new [Re: Relativist]
      #6221884 - 11/28/13 04:27 PM

Slightly off topic, just noticed that 183 people are currently viewing the Planetary and Solar System Observing forum - is that a CN record for single forum activity?

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SteveRosenow
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Re: Comet ISON - Cooked well done? new [Re: djeber2]
      #6221885 - 11/28/13 04:28 PM

http://twitpic.com/dmxc0i

It ain't dead yet!!


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cnargie
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Re: Comet ISON - Cooked well done? new [Re: Relativist]
      #6221886 - 11/28/13 04:28 PM

Here is the next frame from that previous animation I have found 21:13UT

https://pbs.twimg.com/media/BaMDekqCMAAEaBy.png:large


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Tonk
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Re: Comet ISON - Cooked well done? new [Re: Relativist]
      #6221887 - 11/28/13 04:28 PM

Quote:

The tail is what the nucleus leaves behind. With no nucleus there is no tail.




Sorry this is wrong - Tails dont just evaporate! they persist for some time. As I said C/2011 W3 (Lovejoy) tails presisted 3 weeks after the nucleus totally disrupted at T + 1.6 days. The tail dust still follows the orbit but slowly spreads out and disperses due to non gravitational forces


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boandpokey
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Re: Comet ISON - Cooked well done? new [Re: Relativist]
      #6221890 - 11/28/13 04:29 PM

http://www.youtube.com/watch?v=Tk6sSAqoLqM

if anything worth a dang had survived it would look like this


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Nave
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Reged: 02/23/10

Re: Comet ISON - Cooked well done? new [Re: djeber2]
      #6221891 - 11/28/13 04:30 PM

Quote:

Slightly off topic, just noticed that 183 people are currently viewing the Planetary and Solar System Observing forum - is that a CN record for single forum activity?



My first time. I looked for info online before coming here. Fantastic discussion. Thanks to all of you. Fingers crossed.


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Starhunter249
sage


Reged: 06/07/10

Re: Comet ISON - Cooked well done? new [Re: Starhunter249]
      #6221901 - 11/28/13 04:34 PM

Quote:

According an image and a NASA scientist's comment that I had viewed, it appears comet ISON survived or a smaller remnant of it did.




The image I am referring to is LASCO-C2 13NOV28 20:03 UT


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Tonk
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Re: Comet ISON - Cooked well done? new [Re: Starhunter249]
      #6221906 - 11/28/13 04:35 PM Attachment (18 downloads)

and ... this is a headless comet - SOHO (ESA & NASA)

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