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 Post subject: Comet ASASSN
PostPosted: Mon Aug 28, 2017 10:00 am 
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Joined: Sat Jul 24, 2004 12:12 pm
Posts: 1054
Location: Flackwell Heath, Bucks, UK
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Photo taken on the morning of 28 August, the comet is at centre right. Atik 314L+ CCD camera on a Sky-Watcher 80 mm f/6.7 ED refractor, combining 35 25-second exposures (14½ minutes total) with the stars and comet stacked separately. The bright star to upper right of the comet is magnitude 9.42, and the faintest stars shown are about 15th magnitude. Field of view about 55 arc minutes.

For a track and full ephemeris, see the SPA news story at http://www.popastro.com/news/newsdetail.php?id_nw=559.


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 Post subject: Re: Comet ASASSN
PostPosted: Wed Sep 20, 2017 9:59 pm 
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Joined: Sat Jul 24, 2004 12:12 pm
Posts: 1054
Location: Flackwell Heath, Bucks, UK
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IMG_3551-61 crop.jpg [ 129.8 KiB | Viewed 2922 times ]

This is a crop from a stack of 10 1-minute shots with a Canon 70D through the 80 mm refractor, taken at about 01.40 UT on 20 September from Kelling Heath, Norfolk. The star immediately below the comet is mag 10.4. So it doesn't look as though it will be a binocujlar object just yet! The brightest stars are mag 7.

There was a bit of cloud during the sequence hence the interrupted star trails, making them look like footprints! Field of view E-W is 22 arc min.


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 Post subject: Re: Comet ASASSN
PostPosted: Thu Sep 21, 2017 6:14 pm 
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Joined: Fri Dec 03, 2004 9:58 pm
Posts: 3636
Location: Wellingborough
Nice image Robin. The comet is clearly greenish to my eyes :
regards,

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Brian
52.3N 0.6W
Wellingborough UK.

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 Post subject: Re: Comet ASASSN
PostPosted: Sat Sep 30, 2017 12:29 am 
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Joined: Fri Dec 31, 2004 11:32 am
Posts: 633
Location: Macclesfield Cheshire
That's a nice image Robin,

Kelling was good.

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Paul Anthony Brierley
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Macclesfield Astronomical Society
https://www.flickr.com/photos/paulabrierley/
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 Post subject: Re: Comet ASASSN
PostPosted: Sat Sep 30, 2017 9:13 pm 
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Joined: Sat Jul 24, 2004 12:12 pm
Posts: 1054
Location: Flackwell Heath, Bucks, UK
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Here is another photo from Kelling Heath, this time with the Atik 314 L+ camera on the 80 mm refractor on 23 September. I only managed to get seven 1-minute L exposures and three 1-minute triple-binned R, G and B exposures. Mid exposure was 01:40 UT.

The two 'bright' stars just below the comet that point towards it are around 13th magnitude. The comet was supposedly mag 7.9 but I would guess it is more like mag 10.

I stacked separately on the comet and the stars using the supplied Dawn software and managed to combine the two in Photoshop.


Last edited by Robin Scagell on Sat Sep 30, 2017 11:04 pm, edited 1 time in total.
Improved image


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