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Huge comet outburst reported, 17P/Holmes
Elias
post Oct 24 2007, 02:11 PM
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I didnt know in which category of the forum this should be reported:

http://www.fototime.com/%7BE39A64F6-CE74-4...%7D/picture.JPG
http://perso.orange.fr/fkometes/images/com...422-9x5sz05.JPG

Comet 17p/Holmes from 15 mag to 3!! blink.gif

Already visible to naked eye!
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jamescanvin
post Oct 24 2007, 02:37 PM
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Thanks for the heads up.

More information, inc finding chart here.

Now if only these dam clouds would lift.

J


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Ames
post Oct 24 2007, 02:41 PM
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Wow he is correct. Magnitude graph and finder chart here.
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ugordan
post Oct 24 2007, 02:51 PM
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Wow. What's the probability we witnessed this baby breaking up?


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ngunn
post Oct 24 2007, 03:03 PM
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Thanks, folks! I'll be out looking in a few hours.
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stevesliva
post Oct 24 2007, 03:28 PM
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QUOTE (ugordan @ Oct 24 2007, 10:51 AM) *
Wow. What's the probability we witnessed this baby breaking up?

Sounds like it was discovered during/after a big outburst... but that the perihelion has been increasing since then.
http://cometography.com/pcomets/017p.html
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Stu
post Oct 24 2007, 03:40 PM
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Here's where to look folks...

Attached Image


Attached Image


(position plotted on Starry Night Pro, blame them if it's wrong! rolleyes.gif )


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djellison
post Oct 24 2007, 05:00 PM
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Thank god I got my 15x70's off my boss who 'borrowed' them for about a month smile.gif

Doug
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Stu
post Oct 24 2007, 05:02 PM
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This is the latest from the British Astronomical Association...

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In the past 24 hours, a spectacular event has taken place involving the periodic comet P/Holmes (17P). Its predicted brightness is about magnitude 17 however last night it was discovered by the Spanish amateur, Juan Antonio Henríquez Santana to have undergone a tremendous outburst having attained magnitude 10 at that time (Oct 24 0h UT). It was a similar outburst in 1892 that led to its discovery.

Latest reports (Seiichi Yoshida, Oct 24 13h UT) indicate that it is stellar in appearance and 3RD MAGNITUDE in brightness: so bright in fact that it is readily visible to the unaided eye. That's almost one million times brighter than normal !

Fortunately for UK-based observers the comet is well placed for observation and is visible throughout the entire night. Its position at 0h UT tonight (Oct 24/25) will be:

R.A. 03h 53.0m, Dec. +50 08'

Its appearance will probably be that of a fairly bright naked-eye star moving at an apparent rate of close to 10 arcmin per day at PA 298 deg. It is currently 1.63 AU (245 million km) from the Earth.


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Of course, after 3 gorgeously clear nights here in Kendal it's totally (chink) overcast tonight...


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Marz
post Oct 24 2007, 05:09 PM
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Zoiks! If Holmes exploded, is there going to be a cone of cometlets coming to visit in 2014?

I'll have to look for it tonight. I hope it's not fading already.
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akuo
post Oct 24 2007, 06:20 PM
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Thanks guys. I'm a keen comet observer and this was the first I saw of this news. Too bad it looks like it will be cloudy for the whole night here.


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Antti Kuosmanen
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dvandorn
post Oct 24 2007, 06:27 PM
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And my guess here is that it won't be visible to observers in the Western Hemisphere... *sigh*...

-the other Doug


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Stu
post Oct 24 2007, 06:42 PM
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Hey oDoug,

It will be just as visible from Minneapolis as from where I am smile.gif The finder charts I posted are fine for your part of the world too. As long as you can see perseus you can look for the comet. smile.gif


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Paolo
post Oct 24 2007, 06:55 PM
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QUOTE (Stu @ Oct 24 2007, 07:02 PM) *
Of course, after 3 gorgeously clear nights here in Kendal it's totally (chink) overcast tonight...


The same in Milan!


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I'm one of the most durable and fervent advocates of space exploration, but my take is that we could do it robotically at far less cost and far greater quantity and quality of results.

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akuo
post Oct 24 2007, 07:39 PM
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The comet is well placed for anyone in mid-northern latitudes and northward. Perseus is quite high already when it gets dark, and it gets higher in the sky during the night. All you need is some clear weather. For the rest of the northern hemisphere its still visible.

Seiichi Yoshida now reports that the comet has stabilised at 2.8 mag. This would make it look like a bright new star in Perseus (its reported to be stellar in appearance).


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Antti Kuosmanen
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