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Special Ed
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Remember Comet Holmes?
      #5642911 - 01/25/13 04:21 PM

Hi.

Here is a blast from the past. I put together this animation of C17P/Holmes during its rapid expansion. Something to remember while we wait for PANSTARRS to get here.


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Tonk
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Re: Remember Comet Holmes? new [Re: Special Ed]
      #5643039 - 01/25/13 05:40 PM

Can I join in - I haven't got your drawing skills though so heres a panorama!



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Tonk
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Re: Remember Comet Holmes? new [Re: Tonk]
      #5643042 - 01/25/13 05:43 PM

Wonder if we will ever see a comet do this "going bang" act ever again??

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BrooksObs
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Reged: 12/08/12

Re: Remember Comet Holmes? new [Re: Tonk]
      #5643560 - 01/25/13 11:20 PM

The odds are vanishingly small for that, Tonk. The outburst P/Holmes underwent was a whole order of magnitude larger than the next largest outburst ever reported. What we saw has to be considered an utterly unique event.

BrooksObs


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Rich (RLTYS)Moderator
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Re: Remember Comet Holmes? new [Re: Special Ed]
      #5643844 - 01/26/13 06:20 AM

Beautiful sketches and images. I remember doing my share of sketching and observing of comet Holmes. What was fun was watching its gradual expansion. Thanks for the memories.

Rich (RLTYS)


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BrooksObs
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Reged: 12/08/12

Re: Remember Comet Holmes? new [Re: Rich (RLTYS)]
      #5643855 - 01/26/13 06:42 AM

Of the many hundreds of comets that I've followed over the decades what made P/Holmes utterly unique for me was to witness the constant faint scintillation within the coma visible with my 16" scope during the first night or two following the outburst's onset. It was as if the coma contained a fist full of "glitter" that could be seen to sparkle constantly at just above the threshold of detection. I've seen comets exhibit a lot of bizarre phenomenon, but never anything like that!

BrooksObs

Edited by BrooksObs (01/26/13 07:06 AM)


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azure1961p
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Re: Remember Comet Holmes? new [Re: BrooksObs]
      #5644020 - 01/26/13 09:30 AM

That sounds like a compelling visual Brooks. Sorry I missed Holmes. I was in the midst of a move . and astronomy was totally off my radar.
I'm sorry I missed this one.

Pete


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Special Ed
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Re: Remember Comet Holmes? new [Re: BrooksObs]
      #5644040 - 01/26/13 09:42 AM

Thanks, folks.

A great set of images, Tony, that put the expansion in the kind of widefield context it deserves. If I had known that the comet would overwhelm my field of view I might have picked a lower power wider field ep to begin with.

BrooksObs, thanks for the benefit of your experienced point of view. I guess we were fortunate to be in the right place/time to witness the outburst. This wasn't a comet that one forgets, yes?


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ROBERT FREE
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Re: Remember Comet Holmes? new [Re: Special Ed]
      #5644191 - 01/26/13 11:04 AM

i missed holmes myself,but i can vividly remember when i was a young boy in nj not far from nyc comet arend-roland,in spring of 1957,it was brighter than sirius or jupiter an had a real long tail moving across the sky id say over 75 deg an as it moved it like made little jumps an i was hooked on astronomy. i saw it for weeks right overhead it was amazing.i was stunned.

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SteelStar
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Reged: 11/08/09

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Re: Remember Comet Holmes? new [Re: ROBERT FREE]
      #5644548 - 01/26/13 02:52 PM Attachment (41 downloads)

Here are my observations of 17/P Holmes from 10/24/07 to 10/28/07.

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SteelStar
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Reged: 11/08/09

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Re: Remember Comet Holmes? new [Re: SteelStar]
      #5644557 - 01/26/13 02:56 PM Attachment (30 downloads)

10/29/07 to 11/03/07

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SteelStar
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Reged: 11/08/09

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Re: Remember Comet Holmes? new [Re: SteelStar]
      #5644560 - 01/26/13 02:57 PM Attachment (32 downloads)

11/04/07 to 11/08/07

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Dave Mitsky
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Re: Remember Comet Holmes? new [Re: Special Ed]
      #5644762 - 01/26/13 05:15 PM Attachment (38 downloads)

I certainly do.

Comet 17P/Holmes
80mm achromatic refractor
Canon EOS Digital Rebel DSLR
November 3, 2007


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azure1961p
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Re: Remember Comet Holmes? new [Re: Dave Mitsky]
      #5644766 - 01/26/13 05:18 PM

Every image in this thread truly serves to compliment the other. Worked out well Mike!

Pete


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Rich (RLTYS)Moderator
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Re: Remember Comet Holmes? new [Re: azure1961p]
      #5645552 - 01/27/13 07:15 AM

Your right, absolutely beautiful sketches and images. I remember when my wife first saw Holmes she refered to it as the fried egg comet.

Rich (RLTYS)


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Special Ed
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Re: Remember Comet Holmes? new [Re: Rich (RLTYS)]
      #5645574 - 01/27/13 07:52 AM

I agree--I'm really enjoying these sketches and images.

SteelStar, that's an impressive series of drawings (and an equally impressive strech of clear weather ).

Rich, as the comet's shape evolved, some people said it looked like a trilobite (see Tonk's second image from the right).


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Tonk
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Re: Remember Comet Holmes? new [Re: Special Ed]
      #5645588 - 01/27/13 08:11 AM

Quote:

it looked like a trilobite




I had it down as a colourful tropical fish

If you look at the 3rd image in the pano - can you see the disconnected ion tail?

That was a treat to watch it slowly disconnect over a few days. We are sort of looking down its whole length so we see only a foreshortened cross sectional view


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Dave M
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Re: Remember Comet Holmes? new [Re: Special Ed]
      #5645597 - 01/27/13 08:23 AM Attachment (22 downloads)

Holmes was certainly one cool comet, i agree that it looked like a trilobite.
Here`s a image i took on 11/13/07


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BrooksObs
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Reged: 12/08/12

Re: Remember Comet Holmes? new [Re: Special Ed]
      #5645607 - 01/27/13 08:35 AM

It is interesting to note that although many other periodic comets have undergone sudden major brightenings, or outbursts over the years, in every case but the 2007 outburst of P/Holmes evidence of the event fades way after just a few weeks, at most. Even on the occasion of P/Holmes double outburst in 1892 the expanding clouds of debris dissipated within weeks. This brings one to wonder just what transpired to make the 2007 event unique.

I've read at least one explanation that an entire huge section of the comet's surface crust lifted off virtually as a unit and subsequently disintergrated in a progressive fashion, in a sense maintaining, or re-enforcing, the outburst for a longer time.

Nevertheless, the very fact that the largest cometary brightness outbursts in history (in 2007 the comet's brightness increased by a factor of 500,000x, while that of 1892 amounted to about 100,000x), should involve the same object and that their amplitudes should be so much greater than those of any others on record, suggests something rather unique about this particular comet and its apparent repetative behavior. If ever there was a target for a spacecraft flyby, I'd say P/Holmes is it.

BrooksObs

Edited by BrooksObs (01/27/13 08:42 AM)


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Tonk
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Re: Remember Comet Holmes? new [Re: BrooksObs]
      #5645719 - 01/27/13 10:02 AM

Quote:

If ever there was a target for a spacecraft flyby, I'd say P/Holmes is it.




+1 - I'd chip a few quid in


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