Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: Roy on Mar 04, 2021, 22:03:53

Title: NGC891
Post by: Roy on Mar 04, 2021, 22:03:53
NGC891 with part of the Abell 347 Galaxy Cluster (top right hand corner): this is the second complete image that I have produced using PixInsight, in other words I'm a complete beginner with it. The image is limited by the fact that NGC891 is a relatively small object and the focal length of the telescope was only 816 mm.

Roy

(http://gallery.orpington-astronomy.org.uk/albums/userpics/10061/normal_NGC891_Final_OAS.jpg)
Title: Re: NGC891
Post by: Carole on Mar 04, 2021, 22:35:32
That's come out very well Roy nice round stars to all four corners.

As you say it is small for your focal length.

The only thing I think it could benefit from is some increase in saturation of the galaxy colour, and also have a go at Mark's script in Pixinsight - Arcsinh to enhance the star colour.

Well done.

Carole
Title: Re: NGC891
Post by: Roy on Mar 05, 2021, 13:27:58
Hi Carole,

Doh! I had a list of things to do to the image and one of them was to adjust the colour saturation of the stars, but I completely forgot to do it, so thank you for spotting that. As I said I'm still very much a beginner when it come to PixInsight.

Roy

Title: Re: NGC891
Post by: Carole on Mar 05, 2021, 14:45:23
Can't help with Pixinsight, but I know Mark wrote a script for star colour which has been incorporated into Pixinsight I believe it is called Arcsinh.

Carole

Title: Re: NGC891
Post by: NoelC on Mar 05, 2021, 20:32:38
Very nice Roy.
Well done.
Particularly difficult at the minute to hunt galaxies!

Noel
Title: Re: NGC891
Post by: The Thing on Mar 06, 2021, 19:34:16
You got some lovely detail in the dust lane Roy, well done!

The Arcsinh process should enable you to get a colourful stretch without too much bother. Also look at downloading the EZProcessing scripts from Darkarchon  (https://pixinsight.com/forum/index.php?threads/ez-processing-suite.14937/) (the main N.I.N.A. author). They make life much easier in PI.
Title: Re: NGC891
Post by: JohnH on Mar 08, 2021, 18:43:14
You have that galaxy beautifully sharp!

I am floundering around with Pixinsight, I am doing things a bit randomly at the moment and so you have my admiration.

Well done,

John
Title: Re: NGC891
Post by: Roberto on Mar 09, 2021, 15:14:58
Very nice Roy!  Expertly framed!

Ask Mark for a PixInsight tutorial session please  ;)

Roberto
Title: Re: NGC891
Post by: RobertM on Mar 09, 2021, 19:00:01
Lovely image Roy, it's great to see you out imaging.  The scale is a little small but it just means you can see more of the surrounds.

Any image capture details ?

Robert
Title: Re: NGC891
Post by: MarkS on Mar 16, 2021, 16:11:00
Well done Roy - that's a great example of a galaxy!

Mark