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New Naked Eye Comet - 17/P Holmes

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

Hi Folks

Heres the comets tail before this disconnection event that occured over the 8/9th. I have some imgs from that night if they show this event will post them.

Dave Gradwell

Nov 6th Birr ireland

Celestron 80ED Canon Digital Rebel XT

15 years 2 months ago #54371

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

Well done Dave you've definitely got it there.
How long an exposure?
Clear Skies,
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Irish Astronomical Society
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15 years 2 months ago #54374

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

Thnx John

13x 1min exp. flats and darks applied.
Initial processing in ImagesPlus and then numerous layer (Histogram, curves, unsharp mask, gaussian blur) adjustments in Paint Shop ProX.


Dave Gradwell
15 years 2 months ago #54384

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

Very nice image Dave :D
John
15 years 2 months ago #54396

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

No tail, just a 13 minute window in the cloud tonight gave 12x30second images binned at 2x2.

Kieran
16" ODK (incoming), Mesu Mount 200, APM TMB 80mm, SXV H16, SXV H9
J16 An Carraig Observatory
ancarraigobservatory.co.uk/
15 years 2 months ago #54415

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

Tried to image Holmes with the 170 - 500mm Sigma lens at 500mm, F5.6 on Friday evening. This is the result of 81 shots ranging from 15 to 90 seconds using a 350D



The disconnection is faint at the top?
Steve Roche
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15 years 2 months ago #54418

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

Great images lads, it certainly looking less circular these days going by your pictures.
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 #54426

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

Here's one through the 6" from last night (Sunday 11th Nov)...

15 years 2 months ago #54458

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

Nice capture Paul, is that 6'' the scope in your avitar?
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15 years 2 months ago #54463

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

Yes Frank, that's the one!
15 years 2 months ago #54464

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

What are the details of the shot? exp. time. cropped or not etc.
It's always handy to see the info,
My Astrophotography
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15 years 2 months ago #54477

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

Well Frank, it's 3 x 30secs at ISO3200 at f5 - at the prime focus of the LXD75 6N AT scope. The RAWs were converted to TIFF using ACR4 within Photoshop Elements 5. The adjustments were done to make the first frame look "right" then the same adjustments were applied to the other frames - ACR makes this really easy to do.

The three TIFFs along with a TIFF Dark Frame made on another day (purists will wince at this point :-) were processed Deep Sky Stacker 3.02 and the resulting TIFF was adjusted and cropped to approx 50% in Photoshop Elements 5. The Smart Curve and Neat Image plugins were used then the final image was resized for the web with "Save for Web".

Ideally I'd have had 10 or more frames to stack but I had a sound desk to operate in church so had to pack up. When I got back the sky had completely clouded over :-(
15 years 2 months ago #54493

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

Some stunning (and interesting) images guys. I still aint bored of looking at them even after 15 pages! ;)
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15 years 2 months ago #54497

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Replied by Keith g on topic Re:

Is'nt it great that many of you are returning some great images of this comet? Keep up the good work all....

Keith..
If a telescope can fit into your backyard it's too small. If you can't move it, it's too big." -- John Dobson
15 years 2 months ago #54508

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

Here's a wide field from this evening - 5 x 5secs 135mm f2.8 ISO3200 on static tripod. Far too windy to get anything longer.

15 years 2 months ago #54516

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

Oh yeah, don't forget - this months target is indeed Holmes for the November Astrophotography Competition... but all submitted entries (and you're only allowed one Kieran!) must be taken during the month.

Seanie.
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15 years 2 months ago #54530

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

Paul thnks for keeping such a regular track of the comet. It's obvious from this that the comets (coma) shape is becoming more elliptical. Have you tried using a smaller iso setting. I'm only new to this dslr lark myself but most of the "so-called" experts seem to say that theres no point in going over iso400/800. Seemingly the noise gain is much more than any signal gain you get. Isnt it a pity we cant reduce the iso of the wind.

Dave Gradwell
15 years 2 months ago #54541

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

(and you're only allowed one Kieran!)

Highlander 'There can be only one'

Got ya. Hope you've put that new camera to good use :lol:
Kieran
16" ODK (incoming), Mesu Mount 200, APM TMB 80mm, SXV H16, SXV H9
J16 An Carraig Observatory
ancarraigobservatory.co.uk/
15 years 2 months ago #54542

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

Isnt it a pity we cant reduce the iso of the wind.
Dave Gradwell


You said it Dave !
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 #54551

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

Hi Dave,

Yes, in the ideal situation I shoot at ISO800, however the recent conditions have been such that the longer exposures that entails haven't been practical - either because of the wind as you suggest, or because I've had to grab shots through relatively small gaps in rainy clouds and have used a static tripod instead of a driven mount. The ISO3200 of my camera isn't ideal but it's not bad, particularly if I can get a few lights and a dark or two to stack up, and being only 6 million pixels the pixel size is quite big - indeed in regular use my DSLR is no more noisy at ISO3200 than my "bridge" camera - an 8 million pixel Minolta Dimage A2 - is at ISO400!

I'm waiting for some of those crystal clear still nights where I'll be able to get a good stack of 2min exposures at ISO800 and put them all together into something spectacular!
15 years 2 months ago #54554

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

Here's Holmes tonight (Tues Nov 13th)

Firstly the wide view 28mm f2.8 at f4, 6x 30secs, cropped to 75%.



And a closer view 70-210mm "Beercan" lens at 210mm f4 5x 30secs cropped.

15 years 2 months ago #54580

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

Has anyone got a recent magnitude for the core?
Kieran
16" ODK (incoming), Mesu Mount 200, APM TMB 80mm, SXV H16, SXV H9
J16 An Carraig Observatory
ancarraigobservatory.co.uk/
15 years 2 months ago #54700

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

Got about 5 minutes tonight between clouds - only managed to get 2 usable shots before being blanketed in cloud. This has really dimmed and is becoming a hard target naked eye as it gets closer to Perseus Alpha Mag 1.76. Canon 350D, C102SLT, 2 x 30sec @ ISO200.



The ongoing sequence (all shots are the same scale):
26th Oct

28th Oct

2nd Nov

16th Nov


The saga continues...........it's now more than 1.4 Million Kilometers across - not bad for something that started out at about 3Km across, its now the biggest object in our solar system.
Clear Skies,
John Murphy
Irish Astronomical Society
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15 years 2 months ago #54740

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

Love that first shot John, it has a ghostly look to it!
15 years 2 months ago #54748

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

Has anyone see any data on whether the 'outgassing' event has caused any deviation to the comets orbit?
Albert White MSc FRAS
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15 years 2 months ago #54750

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