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GlennLeDrew
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Re: Comet ISON - Cooked well done? new [Re: Glen A W]
      #6222017 - 11/28/13 05:32 PM

If there were any meaningful nucleus remaining, it would have a surface brightness certainly far brighter than the tail (as it was on approach.)

As to the survivabilty of the tail.. An extreme example is a meteor stream, which is comprised of the bigger bits which do not get blown out so quickly by the solar wind from the original comet's orbit. Here we see a very compact version of such a stream, which still contains the less massive dust particles.

This stream will continue along on the orbit, becoming dispersed as the solar wind separates the particles by mass. The less massive ones will spread out into a sheet in the plane of the orbit.


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Glen A W
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Re: Comet ISON - Cooked well done? new [Re: Steve OK]
      #6222020 - 11/28/13 05:33 PM

The brighter streak going all the way around from this morning to now is made of large grains in the parabolic orbit of the comet. There is also a fan shape which is low mass material blowing out from the orbit. I think it is too early to say there is no comet there at the end of the streak!

It is truly remarkable to see the dynamics of the orbit itself plotted out this way. I have never, ever seen anything like it. Even if the comet does not show up in the morning sky, this is still totally awesome.

Edited by Glen A W (11/28/13 05:35 PM)


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Tonk
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Re: Comet ISON - Cooked well done? new [Re: cnargie]
      #6222024 - 11/28/13 05:36 PM Attachment (30 downloads)

SOHO (ESA & NASA) C2 21:48

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MessiToM
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Re: Comet ISON - Cooked well done? new [Re: Glen A W]
      #6222033 - 11/28/13 05:39 PM

what, if any, are the chances we will see visually a headless comet in the dawn similar to lovejoy?

Edited by MessiToM (11/28/13 05:40 PM)


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Glen A W
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Re: Comet ISON - Cooked well done? new [Re: MessiToM]
      #6222036 - 11/28/13 05:41 PM

No one should hand out chances. One of the scientists in the NASA coverage stated that ISON was an unusual comet because... and then listed all the typical reasons why every comet is unpredictable. There is no way to tell.

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Relativist
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Re: Comet ISON - Cooked well done? new [Re: MessiToM]
      #6222037 - 11/28/13 05:41 PM

Quote:

what, if any, are the chances we will see visually a headless comet in the dawn similar to lovejoy?




That would be quite a laser show!


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Ptarmigan
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Re: Comet ISON - Cooked well done? new [Re: MessiToM]
      #6222043 - 11/28/13 05:44 PM

Quote:

what, if any, are the chances we will see visually a headless comet in the dawn similar to lovejoy?




That would be nice to see.


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Relativist
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Re: Comet ISON - Cooked well done? new [Re: Ptarmigan]
      #6222055 - 11/28/13 05:48 PM Attachment (19 downloads)

In contrast to the outbound image. Please note the relative velocities with respect to the solar wind. With the decrease in such relative velocities I would think that the friction would likewise be reduced, hence the brightness. To what extent this fact precludes destruction or survival of a nucleus I do not know.

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Relativist
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Re: Comet ISON - Cooked well done? new [Re: Relativist]
      #6222066 - 11/28/13 05:58 PM

Here is a comet swinging past the sun. notice the reformation of the tail once it leaves the vicinity of the sun.

http://sohowww.nascom.nasa.gov/bestofsoho/Movies/cometM/cometM.mov


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OldDeadOne
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Re: Comet ISON - Cooked well done? new [Re: Relativist]
      #6222068 - 11/28/13 05:59 PM

Curtis note how early that pic is compared to Tonks....

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Relativist
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Re: Comet ISON - Cooked well done? new [Re: OldDeadOne]
      #6222080 - 11/28/13 06:01 PM

Quote:

Curtis note how early that pic is compared to Tonks....




Yes, that is an inbound image, and it's much brighter!


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Relativist
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Re: Comet ISON - Cooked well done? new [Re: Relativist]
      #6222097 - 11/28/13 06:12 PM

Looks like its emerged in the C3 view:

http://198.118.248.97/data/realtime/c3/1024/latest.html


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MessiToM
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Re: Comet ISON - Cooked well done? new [Re: Relativist]
      #6222100 - 11/28/13 06:14 PM

there "it" is sorry ^ didnt see your post
http://198.118.248.97/data/realtime/c3/1024/latest.html

Edited by MessiToM (11/28/13 06:15 PM)


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Relativist
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Re: Comet ISON - Cooked well done? new [Re: MessiToM]
      #6222102 - 11/28/13 06:17 PM

While we wait, you can watch similar movies.

http://198.118.248.97/bestofsoho/Movies/comets.html


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Tonk
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Re: Comet ISON - Cooked well done? new [Re: Relativist]
      #6222103 - 11/28/13 06:18 PM

Quote:

I would think that the friction would likewise be reduced, hence the brightness. To what extent this fact precludes destruction or survival of a nucleus I do not know.




"Friction" is not a factor! Its radiation that heats up the comet, and drives of the volatilised material. Its differential tidal forces that pulls the remains apart.

The atomsphere of the sun is a better vacuum than the best created on earth.

The best the solar wind can do is knock about particles at the micrometer size range


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Starhunter249
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Reged: 06/07/10

Re: Comet ISON - Cooked well done? new [Re: Tonk]
      #6222111 - 11/28/13 06:23 PM

Global news - Ison lives, sort of.

http://globalnews.ca/news/997084/the-end-of-ison-not-quite/


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Tonk
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Re: Comet ISON - Cooked well done? new [Re: Starhunter249]
      #6222112 - 11/28/13 06:24 PM Attachment (16 downloads)

and whats this poking out ... the zombie comet! Spooooky - SOHO (ESA & NASA)

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brentwood
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Re: Comet ISON - Cooked well done? new [Re: boandpokey]
      #6222115 - 11/28/13 06:25 PM

Quote:

http://198.118.248.97/data/realtime/c3/1024/latest.html


nothing gone kaput




What is that very bright object at 11o'clock?


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Tonk
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Re: Comet ISON - Cooked well done? new [Re: Tonk]
      #6222116 - 11/28/13 06:26 PM Attachment (26 downloads)

meanwhile back on C2 ... SOHO (ESA & NASA)

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Starhunter249
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Re: Comet ISON - Cooked well done? new [Re: Tonk]
      #6222121 - 11/28/13 06:31 PM

Wow at 2013/11/28 22:24 LASCO C2

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