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Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: RobertM on Jun 25, 2020, 20:46:39

Title: Open Cluster NGC6939 and NGC6946 (the fireworks galaxy)
Post by: RobertM on Jun 25, 2020, 20:46:39
Another one completely automated, including skyflats, with Voyager.  111 x 5min (9.25 hours) dithered exposures @Gain 100/Offset 50 using the ASI2600MC and Esprit 150, calibrated with bias, flats and scaled darks.  I think it would be better during astronomical night time but it's nice to be imaging again.  Processed in Pixinsight/Affinity using the same pipeline as with M13.  The LP gradients were very easy to remove so it was quite an easy process in the end.  There also seems to be quite a bit of background dust because of the proximity to the Milky Way running through Cygnus (these objects are on the Cepheus/Cygnus border).

(https://live.staticflickr.com/65535/50044167258_773563daaf_h.jpg)

2k version: https://live.staticflickr.com/65535/50044167258_5483628b53_k.jpg (https://live.staticflickr.com/65535/50044167258_5483628b53_k.jpg)
4k version: https://live.staticflickr.com/65535/50044167258_98f3c6a993_4k.jpg (https://live.staticflickr.com/65535/50044167258_98f3c6a993_4k.jpg)
Full size 6k: https://live.staticflickr.com/65535/50044167258_eb66d9c674_6k.jpg (https://live.staticflickr.com/65535/50044167258_eb66d9c674_6k.jpg)

As always, suggestions are very welcome.

Hope you like it
Robert
Title: Re: Open Cluster NGC6939 and NGC6946 (the fireworks galaxy)
Post by: Hugh on Jun 25, 2020, 21:59:25
Nice combination of the cluster at 4,000 ly, the galaxy at 25 million ly's and all those stars!

Lovely shape as well to the galaxy.

Hugh
Title: Re: Open Cluster NGC6939 and NGC6946 (the fireworks galaxy)
Post by: Carole on Jun 26, 2020, 08:58:31
Very nice Robert.  As you say nice to see you imaging again.

Carole
Title: Re: Open Cluster NGC6939 and NGC6946 (the fireworks galaxy)
Post by: NoelC on Jun 27, 2020, 00:06:19
Wow - really good.
So many stars...
Noel
Title: Re: Open Cluster NGC6939 and NGC6946 (the fireworks galaxy)
Post by: MarkS on Jun 27, 2020, 09:32:03
Fully automated, eh?  Nice one.  Automating the sky flats is the icing on the cake!

That's a great composition with the galaxy and cluster and it's nice to see the background dust beginning to appear.

There's a lot of detail in the larger versions.

Mark
Title: Re: Open Cluster NGC6939 and NGC6946 (the fireworks galaxy)
Post by: RobertM on Jun 27, 2020, 12:13:47
Thank you for your kind replies.  Hopefully there should be a Mk2 of this image at some point with more data, weather permitting.

Robert

Title: Re: Open Cluster NGC6939 and NGC6946 (the fireworks galaxy)
Post by: The Thing on Jun 29, 2020, 10:03:50
Very nice Robert. Nice composition and plenty of little galaxy teasers lurking in the stars. Looks like you have got a good processing pipeline going.
Title: Re: Open Cluster NGC6939 and NGC6946 (the fireworks galaxy)
Post by: Roberto on Jul 02, 2020, 13:10:01
Late to the party...great image Robert!  I like the 6K version  ;)

Roberto
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