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New Naked Eye Comet - 17/P Holmes

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

Guys,

There is a really neat photo on SpaceWeather right now which includes a visible trail as well as structure within the nucleus.

I may have a break in the weather to finally have "first light" (visually and photographically) with this comet later tonight.
Anthony Ayiomamitis
Athens, Greece
www.perseus.gr
15 years 3 months ago #53913

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

Is that the one by Sebastian Voltmer? Truly awesome image - I just don't have the sky to get anywhere near that!
15 years 3 months ago #53914

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

Hi Paul,

Yes, this is the photo .... very stunning work!

I will be up all night trying to catch a 2-hr sucker hole for my first glimpse. Fingers crossed.
Anthony Ayiomamitis
Athens, Greece
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15 years 3 months ago #53915

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Replied by daveg on topic Holmes from the 29th

Heres Holmes from the 29th

Celestron 80ED Digital rebel XT 5x1 min exp no flats or darks.

Dave Gradwell

15 years 3 months ago #53917

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

Finally got a glimpse this evening through a break in the clouds.
Nive photo Paul. You can really see the tail in the negative.
Derek
15 years 3 months ago #53924

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

Hi again

thanks Michael O and dmsdona
I was lucky this evening and got a second chance for looking at this comet
it's bigger then 4 days ago and has moved
i made a new montage of this, so you can see the distance it has traveled
along the skies
this and the originals are in my web-folder

i hope you like it



picasaweb.google.nl/H.Nieborg/Astrofotos...#5128798670130880018
Henk
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15 years 3 months ago #53930

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

This comet is nearly 1/3rd the size of the full moon, it not exactly nearby as its out by the asteroid belt, anyone able to find an estimate of the size of this thing?
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. :)
+ 12"LX200, MK67, Meade2045, 4"refractor
15 years 3 months ago #53933

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

that's what i wanted to know Dave L.

i found an article on wikipedia, they talk about a size of 70% of the diameter of the sun:

en.wikipedia.org/wiki/17P/Holmes

interesting article
Henk
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15 years 3 months ago #53942

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

This was Holmes last night at a distance of 2.48 au from the sun



Now compare this with Tuttle(mag 12) at 1.59 au from the sun




I used the small angle formula on the Holmes image and this gave a diameter of about 1 million km for the coma.
Kieran
16" ODK (incoming), Mesu Mount 200, APM TMB 80mm, SXV H16, SXV H9
J16 An Carraig Observatory
ancarraigobservatory.co.uk/
15 years 3 months ago #53944

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

I'm well impressed that you can get Tuttle at that magnitude Kieran - excellent work!
15 years 3 months ago #53945

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

Tuttle might as well just give up!
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15 years 3 months ago #53963

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

*Moved to the Astrophotography forum, and made a sticky due to its constant interest*
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15 years 3 months ago #53973

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

Should it not stay in general??
Cheers
Trevor
15 years 3 months ago #53986

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

I wouldn't have put it in the astrophotography section, there are images here but there to complement the discussion, I would have had it in the "Solar System Objects" forum or leave it where it was.
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. :)
+ 12"LX200, MK67, Meade2045, 4"refractor
15 years 3 months ago #53988

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

I wouldn't have put it in the astrophotography section, there are images here but there to complement the discussion, I would have had it in the "Solar System Objects" forum or leave it where it was.


I'd agree with that too.
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15 years 3 months ago #53989

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

Amazing !!!
To think that this thing is nearly the same size as the sun itself, its a truly amazing object.
I was thinking about how to figure out the size of the tail behind it, is there an equation for calculating the tail behind it given the distance from the sun, the strength of the solar wind at that distance, its motion and out gassing rate ???
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. :)
+ 12"LX200, MK67, Meade2045, 4"refractor
15 years 3 months ago #53997

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

Dave,

I may be preaching to the wise on this but if you know the image scale with the camera, ie arcsec per pixel, then you can measure the angular distance from an image and use this with the published distance to the object in the small angle formula

astronomyonline.org/Science/SmallAngleFormula.asp
Kieran
16" ODK (incoming), Mesu Mount 200, APM TMB 80mm, SXV H16, SXV H9
J16 An Carraig Observatory
ancarraigobservatory.co.uk/
15 years 3 months ago #54038

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

Tuttle might as well just give up!


Seanie,

just wait til the end of December when it skirts M33, should be a lovely photo op.
Kieran
16" ODK (incoming), Mesu Mount 200, APM TMB 80mm, SXV H16, SXV H9
J16 An Carraig Observatory
ancarraigobservatory.co.uk/
15 years 3 months ago #54039

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

Hi Kieran,
For my SCT setup its even more painful then that as the arc second per pixel is not a constant, it changes depending on the distance between the back of the scope and the camera, the only way I'd be able to figure the FOV of the image is to open starrynight for that FOV and measure it, I'll get around to doing that during the week maybe.
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. :)
+ 12"LX200, MK67, Meade2045, 4"refractor
15 years 3 months ago #54040

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

Dave,

Who said astronomy was a hobby, sometimes you have to work at it :lol: . In the Dob is it not starting to blind you?
Kieran
16" ODK (incoming), Mesu Mount 200, APM TMB 80mm, SXV H16, SXV H9
J16 An Carraig Observatory
ancarraigobservatory.co.uk/
15 years 3 months ago #54041

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

Tuttle might as well just give up!


Seanie,

just wait til the end of December when it skirts M33, should be a lovely photo op.


Then I take that back. Lets hope that a nice wide field shot opportunity beckons with my 300mm lens!

;)
Midlands Astronomy Club.
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Former IFAS Chairperson and Secretary.
15 years 2 months ago #54053

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

Tuttle might as well just give up!


Seanie,

just wait til the end of December when it skirts M33, should be a lovely photo op.



Or wait further until the 3rd of May when it encounters M38
:D
My Astrophotography
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15 years 2 months ago #54063

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

Heres some Nov 6th



Celestron 80ED piggybacked on a Celestron CG11
Canon Digital Rebel Xt
13 x 1 min exposures plus darks and flats
processing in ImagesPlus; PaintShop Pro; and Photoshop.
6 November at 03:02
Near Birr Ireland

The obvious green coma outer part of the coma is gone but there is a brightening off to the south. There is also an obvious extension of the coma to the south and when I over process the image the ion tail is obvious... will post later.


DaveG
15 years 2 months ago #54222

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

Still waiting on this ion tail DaveG. Hurry up and finishing processing - its now 10th.

Love to see it pleeease!

Beaut photo by the way, you obviously put a lot of work into this one.

Have a look at this though. It puts us all to shame, I'd love to know more about the exposure details:
spaceweather.com/comets/holmes/09nov07/J...nm9mnsr1c32t6phgs3o6

The comet tonight looked truely remarkable in 15x70 binos. Didn't bother trying to photo because of winds and cloud though. Its getting bigger all the time and the mass of the outburst must now be occupying an area bigger than the sun. Truely a remarkable event, is there any news yet from Nasa on Hubble or Cassini data on this? :?:
Clear Skies,
John Murphy
Irish Astronomical Society
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15 years 2 months ago #54363

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

Dave,

Who said astronomy was a hobby, sometimes you have to work at it :lol: . In the Dob is it not starting to blind you?

I'm almost ashamed to say that I haven't seen in in the Dob for over a week now, just no opportune time when i was free. :(
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. :)
+ 12"LX200, MK67, Meade2045, 4"refractor
15 years 2 months ago #54366

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