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MessiToM
scholastic sledgehammer
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Reged: 12/21/09

Loc: Huntingdon PA
Re: Comet ISON - Cooked well done? new [Re: TechPan6415]
      #6224468 - 11/30/13 12:47 AM

Back to ISON......it looks much dimmer now.

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timtrice
sage


Reged: 08/01/13

Loc: Katy, TX
Re: Comet ISON - Cooked well done? new [Re: MessiToM]
      #6224485 - 11/30/13 01:03 AM

Quote:

Back to ISON......




PLEASE....


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krp
Vendor. DarkSiteFinder.com


Reged: 11/10/10

Loc: Central Illinois
Re: Comet ISON - Cooked well done? new [Re: timtrice]
      #6224490 - 11/30/13 01:11 AM

Here's the latest blog post from Karl Battam:
ISON Campaign

It looks like ISON has almost exited the FOV of stereo and soho. It seems like it will be hard to monitor in the next few days before earth based telescopes can pick it up again.


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Crusader
Pooh-Bah


Reged: 08/14/05

Loc: Prince Albert, South Africa
Re: Comet ISON - Cooked well done? new [Re: krp]
      #6224545 - 11/30/13 02:42 AM

The Planetary Society has a great post up with loads of images and animations. The views from Stereo Behind are the best I've seen so far - view here.

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DNTash
scholastic sledgehammer
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Reged: 09/02/07

Loc: GMT+2
Re: Comet ISON - Cooked well done? new [Re: Crusader]
      #6224567 - 11/30/13 03:26 AM

Agree. That's a great site to go to for all the views, and the Stereo Behind seem quite rich.

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PowellAstro
scholastic sledgehammer
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Reged: 10/14/09

Loc: Tennessee
Re: Comet ISON - Cooked well done? new [Re: DNTash]
      #6224686 - 11/30/13 07:46 AM

Looks like it is doing fine to me and it has brighted back up!

ISON SURVIVES


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Jure Atanackov
super member


Reged: 05/04/10

Re: Comet ISON - Cooked well done? new [Re: PowellAstro]
      #6224700 - 11/30/13 08:09 AM

Seriously?

http://sohowww.nascom.nasa.gov/data/realtime/c3/1024/latest.html

What is it going to take ...?


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SteveRosenow
professor emeritus
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Reged: 07/10/12

Loc: Shelton, Washington
Re: Comet ISON - Cooked well done? new [Re: Jure Atanackov]
      #6224737 - 11/30/13 08:35 AM

Quote:

Seriously?

http://sohowww.nascom.nasa.gov/data/realtime/c3/1024/latest.html

What is it going to take ...?




Please be mindful that Comet Seki-Lines did the same thing in 1962. As our esteemed friend John Bortle has illustrated, Seki Lines was anticipated to achieve mag. -7 at perihelion yet disappeared in the exact manner that ISON has done and was not seen again until it was re-discovered three days later, and both Seki-Lines and ISON are sharing an awful lot of qualities.

I think we're all jumping to conclusions here. Let's allow this situation to play itself out. It very may well explode in brightness (NASA's Tamitha Skov has indicated it may rebuild the coma and tail in about 2-3 days), or it may not.

Let's lay this "It's dead, Jim" talk to a rest until we know for sure.


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Tonk
Postmaster
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Reged: 08/19/04

Loc: Leeds, UK, 54N
Re: Comet ISON - Cooked well done? new [Re: TechPan6415]
      #6224783 - 11/30/13 09:11 AM

Quote:

Jakub Cerny has been making a heap of predictions throughout this. He might make a correct guess at some stage.




He was not making a prediction. He was taking a measurement - sheesh!


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ohioalfa64
sage


Reged: 08/16/12

Loc: Ohio (NW)
Re: Comet ISON - Cooked well done? *DELETED* new [Re: Tonk]
      #6224813 - 11/30/13 09:25 AM

Post deleted by ohioalfa64

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dyslexic nam
Carpal Tunnel
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Reged: 01/28/08

Loc: PEI, Canada
Re: Comet ISON - Cooked well done? new [Re: ohioalfa64]
      #6224904 - 11/30/13 10:30 AM

Still hung up on that eh?

There are places on CN to discuss copyright and terms of service. A thread about ISON is not that place.


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MessiToM
scholastic sledgehammer
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Reged: 12/21/09

Loc: Huntingdon PA
Re: Comet ISON - Cooked well done? new [Re: dyslexic nam]
      #6224939 - 11/30/13 10:59 AM

http://sohowww.nascom.nasa.gov/data/realtime/c3/1024/latest.html

It's see through now. Very dim.


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Awesomelenny
Post Laureate
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Reged: 05/02/04

Loc: Long: 81.42 W Lat: 41.21 N
Re: Comet ISON - Cooked well done? new [Re: MessiToM]
      #6224946 - 11/30/13 11:04 AM

It's becoming just a vaporized mist.

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BrooksObs
professor emeritus


Reged: 12/08/12

Re: Comet ISON - Cooked well done? new [Re: ohioalfa64]
      #6224968 - 11/30/13 11:19 AM

A few additional points worthy of mention are merited at this particular time.

While ISON's photometric behavior leading up to and around the time of perihelion do seem to largely mimic that seen in conjunction with 1962's impressive Comet Seki-Lines, the failure of ISON's current cloud-like coma to exhibit any area of increasingly obvious condensation as the cloud thins, as well as its overall fading and growing diffuseness, do not correspond to Seki-Lines' post-T regeneration.

Although shortly after reappearing from behind the SOHO LASCO C2's occulting disk the inner coma's rapidly expanding spray of material implied the presence of dust particles with a broad range in particle sizes, this situation did not progress. Neither the "cloud-like" coma, nor any tail aspect grew strongly in brightness over the past 24 hours. The only major alteration evident was the expansion of the coma's dimensions and the steady decline in its surface brightness.

At present, to truly be similar in behavior with C/Seki-Lines, ISON would be developing an increasingly small, dense , very bright condensation within the coma. Likewise, the intensity and length of the tail(s) would be rapidly growing , just as we saw in the case of 2011 W3 Lovejoy immediately following its perihelion.

My growing concern would be that C/ISON may have been somehow much more asteroidal in composition than most other comets, frosted over with perhaps just a few tens of meters of loose surface ice and some stone, harboring an otherwise mainly rocky solid body within. This outer layer might explain the typical strong ion tail exhibited by the comet in its last days before perihelion.

We will likely lose sight of C/ISON in the C3 camera late today. I'm not sure about the STEREO cameras. However, it looks like there will be at least a 2-4 day blind spot coming for us. Extrapolating from the last 48 hours images and the opinions expressed above, what may reappear out of the twilight thereafter could well be very different from Seki-Lines. It could, in fact, be nothing more than a rather large, low surface brightness, diffuse cloud showing just a trace of tail!

BrooksObs


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SteveRosenow
professor emeritus
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Reged: 07/10/12

Loc: Shelton, Washington
Re: Comet ISON - Cooked well done? new [Re: BrooksObs]
      #6224995 - 11/30/13 11:36 AM

Quote:


At present, to truly be similar in behavior with C/Seki-Lines, ISON would be developing an increasingly small, dense , very bright condensation within the coma. Likewise, the intensity and length of the tail(s) would be rapidly growing , just as we saw in the case of 2011 W3 Lovejoy immediately following its perihelion.



BrooksObs




I am not certain if this is noise or a star, but the latest C3 shows a bright speck that was not present in previous frames.

And it's in the corresponding vicinity where the nucleus should be, on ISON.


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Dave M
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Reged: 08/03/04

Loc: Ohio
Re: Comet ISON - Cooked well done? new [Re: BrooksObs]
      #6224996 - 11/30/13 11:36 AM

Is that the nucleus between the two brighter stars in this C3 image ?
Steve, you beat me to it
http://sohowww.nascom.nasa.gov/data/realtime/c3/1024/latest.html


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SteveRosenow
professor emeritus
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Reged: 07/10/12

Loc: Shelton, Washington
Re: Comet ISON - Cooked well done? new [Re: Dave M]
      #6225000 - 11/30/13 11:36 AM

Quote:

Is that the nucleus between the two brighter stars in this C3 image ?
http://sohowww.nascom.nasa.gov/data/realtime/c3/1024/latest.html




LOL I just mentioned the same thing.


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pstarr
Carpal Tunnel
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Reged: 09/17/04

Loc: NE Ohio
Re: Comet ISON - Cooked well done? new [Re: Dave M]
      #6225002 - 11/30/13 11:38 AM

Very good clips of the whole solar encounter here

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Tonk
Postmaster
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Reged: 08/19/04

Loc: Leeds, UK, 54N
Re: Comet ISON - Cooked well done? new [Re: SteveRosenow]
      #6225016 - 11/30/13 11:43 AM

The SOHO coronagraph sensors regularly record solar wind particles hitting the silicon as bright spots. Just be aware of this.

Watching a CME coming head on to SOHO is awesome - it ends with a dense "snow storm" as hundreds of high energy protons and electrons pepper the sensor

http://www.youtube.com/watch?v=IF0-wpXBulk

Note the low level peppering between CME hits - comparing adjacent frames will help to discount spureous events


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SteveRosenow
professor emeritus
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Reged: 07/10/12

Loc: Shelton, Washington
Re: Comet ISON - Cooked well done? new [Re: Tonk]
      #6225019 - 11/30/13 11:45 AM

Quote:

The SOHO coronagraph sensors regularly record solar wind particles hitting the silicon as bright spots. Just be aware of this.

Watching a CME coming head on to SOHO is awesome - it ends with a dense "snow storm" as hundreds of high energy protons and electrons pepper the sensor




Yes, I am mindful of that.


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