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New Naked Eye Comet - 17/P Holmes

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Replied by ftodonoghue on topic Re: New Naked Eye Comet - 17/P Holmes

The view through the dob tonight is spectacular and the pic below does not do it justice at all.



Canon Eos 300D,
90mm short tube refractor
iso 800
4seconds
26october 21.20pm

and a widefield one. This is 10 seconds iso 800
Cheers
Trevor
15 years 3 months ago #53269

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Replied by mjs on topic Re: New Naked Eye Comet - 17/P Holmes

Nice images there Trevor. Just to complete the set from Kerry here is an image close up showing the nucleus and the coma. Taken with a webcam through the 222mm Dob. Just 156 frames processed in Registax 4
15 years 3 months ago #53279

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Replied by michaeloconnell on topic Re: New Naked Eye Comet - 17/P Holmes

Great images everyone.
That's a particularly good one Michael.
It also shows something which I thought I saw in the scope but wasn't sure if it was just me.
About two thirds of the ways out in the halo is a slightly dark band. See what I'm talking about?
15 years 3 months ago #53281

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Replied by Frank Ryan on topic Re: New Naked Eye Comet - 17/P Holmes

Great images lads.
Mike S, YOU NAILED IT!

Thats almost an exact match to what we observed in the 20'' last night.

Mike OC,
yip, that band was very obvious in the obsessionator.
I could even see it in the etx125 a few nights ago (see earlier post of mine)

Dave and I both could see a slight 'tail' or, how could I word it...
'impression' of a tail...
very early stages yet but we both saw it when we used a particular filter
(Can't remember which one...Dave?)
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15 years 3 months ago #53282

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Replied by mjs on topic Re: New Naked Eye Comet - 17/P Holmes

it also shows something which I thought I saw in the scope but wasn't sure if it was just me.
About two thirds of the ways out in the halo is a slightly dark band. See what I'm talking about?

Michael, I thought that I could see that too through the eyepiece but put it down to my eyes.. But there is a hint of it in the image alright. Like looking at a bubble, or a spherical shell of expanding smoke with a slightly brightening towards the outer edge.
Another thing I noticed on all images processed is the slightly elongated nucleus??
15 years 3 months ago #53286

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Replied by JohnMurphy on topic Re: New Naked Eye Comet - 17/P Holmes

Here's the latest from tonight at 00:18UT 27/10/2007.
My estimate is a mag of slightly greater than mag 2.0. It's still getting brighter. What caused it? My guess is an impact with an asteroid.
We (IAS) have asked for Cassini and Hubble to be trained on this unique event but the response is slow.


Canon 350D 30sec @ISO100 3 image composite. Celestron 102SLT. Conditions were horrible, these shots were taken through cloud and full moonlight.
Clear Skies,
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15 years 3 months ago #53288

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Replied by dave_lillis on topic Re: New Naked Eye Comet - 17/P Holmes

Lads,
Great images by all.
Michael S, the image you got is exactly how we saw it, except it was brighter and the mini fan tail was more defined.
I thought the core was at times stellar like but at other times was definitely elongated, I had put it down to seeing or a warm mirror, but now seems to be real.
Frank, we used a IDAS filter, it helped the darken the background while not swamping out the comet although its not the ideal filter for this object.
Michael OC, you are absolutely right about the dark ring/area in the coma, we definitely saw it.
The full moon is a real killer for trying to see anything resembling a tail, anyone used a comet/cyanogen filter on this comet yet ?
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15 years 3 months ago #53295

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Replied by mjs on topic Re: New Naked Eye Comet - 17/P Holmes

..except it was brighter and the mini fan tail was more defined.

I would agree Dave, there was a much more defied fan shape to the mini tail on Thursday night. It was more squat and diffuse last night.

Isn't it great to see such dynamic changes fron night to night. Come to think of it it is just great to be able to see it three nights in a row. I do not have much hope for tonight though....
15 years 3 months ago #53301

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Replied by dave_lillis on topic Re: New Naked Eye Comet - 17/P Holmes

Lads
Did it look bigger last night, it was about 5 arc mins on thursday, if it go to 15 it would become a naked eye disk in the sky, lets hope it gets there. !!
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Carrying around my 20" obsession is going to kill me,
but what a way to go. :)
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15 years 3 months ago #53302

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Replied by DeirdreKelleghan on topic post



Comet 17/P Holmes
26 October 2007/ 1200mm/8mm/150X/ Watercolor / Pastels/ Conte
barlows did nothing for the image

I had a 30 minute window in between clouds, to catch this icy visitor in my telescope. I had to shield my scope and my eyes form the moon light by hiding behind my house.

First I looked in my 15X70 binos, and I could see a halo around the comet, a very different view to October 24th, I reckoned this had brightned to around Mag 2.

I popped my 8mmTVP into the scope and oh yes this was a sketch I had to have. So here it is,cloud and rain here in Bray at the moment so most likely not look this evening.
I am thinking up new ways of getting this comet, it is a challenge to sketch as it has so many properties to deal with. Hope it's there for a while longer.

Deirdre Kelleghan
Irish Astronomical Society
15 years 3 months ago #53309

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Replied by Seanie_Morris on topic Re: New Naked Eye Comet - 17/P Holmes

There are some fab images there lads and lassie. Nicely done!
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15 years 3 months ago #53313

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Replied by Frank Ryan on topic Re: New Naked Eye Comet - 17/P Holmes

if it go to 15 it would become a naked eye disk in the sky


:shock:
That'd be too cool for school.
G'waaan Holmes!
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15 years 3 months ago #53320

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Replied by mia on topic Re: New Naked Eye Comet - 17/P Holmes

I've seen it through the bins on Wednesday and finally got the chance to see it last night through the scope, I'm amazed by it! This is my fourth comet and looks nothing like the others!!

Does anyone have an idea what caused the outburst? I've had explanations re the 'missing' tail and why it looks different, but nothing yet re the cause of the outburst.

The most popular explanations seem to be either impact from an asteroid or the ilk, or some reaction from within the comet.

I know it was discovered thanks to a similiar outburst, did they come to any conclusion then what caused it?
15 years 3 months ago #53322

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Replied by johnflannery on topic Re: New Naked Eye Comet - 17/P Holmes

Hi Mia and everyone,

Legendary comet expert John Bortle has a message on the comet mail list speculating on the possibility of a partial collapse of a section of the comet on itself. Read more at tech.groups.yahoo.com/group/comets-ml/message/12908


On the point of the dark band seen by observers we were speculating today that the band could be the shadow(s) of the bright jet of material from the nucleus projected on the expanding shell -- similar to seeing the shadow of a jet aircraft contrail against the underside of a cloudbank. A way to confirm would be to determine if the shadows rotate at a rate that might be consistent with the bright jet, as the nucleus spins.

Another idea I was mulling over was whether more recent eruptions of material are "shocking" earlier shells of dust puffed off from the nucleus/site of outgassing. I'd lean more towards the former idea but could be way off the mark here on all theories :roll: :D 8-)

Clear skies!

John
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15 years 3 months ago #53352

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Replied by michaeloconnell on topic Re: New Naked Eye Comet - 17/P Holmes

I like that sketch Dee. Very accurate.
15 years 3 months ago #53354

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Replied by phoenix on topic Re: New Naked Eye Comet - 17/P Holmes

Apologies if its been posted but the link below shows how it all started

artics.de/c.rollwagen/public/AC/17P.swf
Kieran
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15 years 3 months ago #53358

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Replied by voyager on topic Re: New Naked Eye Comet - 17/P Holmes

Apologies if its been posted but the link below shows how it all started

artics.de/c.rollwagen/public/AC/17P.swf


That's fantastic! It really shows just how dynamic this object is.

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15 years 3 months ago #53359

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Replied by phoenix on topic Re: New Naked Eye Comet - 17/P Holmes

Imagine sitting at the scope doing an imaging run on this when it starts to bloom up :o . You would be freaking out, checking focus, dew build up etc.
Kieran
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ancarraigobservatory.co.uk/
15 years 3 months ago #53360

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Replied by dave_lillis on topic Re: New Naked Eye Comet - 17/P Holmes

Thats class!,
Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)

Carrying around my 20" obsession is going to kill me,
but what a way to go. :)
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15 years 3 months ago #53362

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Replied by JohnMurphy on topic Re: New Naked Eye Comet - 17/P Holmes

I've just come in after a quick check and it seems bigger than last night though not brighter, I think it's becoming more diffuse. Also, I thought I could detect some redness in the lower part, and more green in the top - not chromatic abberation in the optics by the way, I thought I saw some red naked eye before running in for the binos. Very fast moving cloud out there is allowing occasional seeing.
Clear Skies,
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15 years 3 months ago #53364

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Replied by mjs on topic Re: New Naked Eye Comet - 17/P Holmes

Well, I always thought those that left a warm bed to go observing were a little bit odd, but when I saw the Moon shining through the window at 5:45 this morning I had to go and get up. The sky was already brightening but the comet was still bright.
This is the result of some attempt at imaging.

This is the same equipment, settings and processing, as the earlier image taken on the 27th below so the difference in size from the image taken earlier is Real! I also think I can see a hint of a jet at the 7 o'clock position??

Both images were taken through my Dobsonisan so up is up and not north, if you know what I mean, so with 9 hours rotation... 135 degrees??? it is too early for those calculations.
Now is there any way I can sneak back to bed...
15 years 3 months ago #53380

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Replied by JohnMurphy on topic Re: New Naked Eye Comet - 17/P Holmes

Spaceweather has a cool shot of what the comet looks like in comparison to Jupiter - really puts things in perspective:

www.spaceweather.com/comets/holmes/27oct...ns2a1i1unnn2a1521rh1
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15 years 3 months ago #53381

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Replied by paulevans on topic Re: New Naked Eye Comet - 17/P Holmes

Just caught Holmes in the 10x50s as the light has faded - it's brighter than Mirphak!!

We're still in between rain showers here but I'll be getting the 'scope on it shortly.

Clear skies,

Paul.
15 years 3 months ago #53392

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Replied by Frank Ryan on topic Re: New Naked Eye Comet - 17/P Holmes

Wow. Bigger than Jupiter and getting brighter..
Some say they can see the expanding shell naked eye.
That 'cone' really does seem to be where the out gassing is occurring.
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15 years 3 months ago #53393

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Replied by paulevans on topic Re: New Naked Eye Comet - 17/P Holmes

Yes, it is obviously not point like even in the twilight sky. Took this quick snap - this is real pixels cropped down showing the DSLR view through a 210mm lens at 1750 GMT this evening

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