Jump to content

SkySurveyBanner.jpg.21855908fce40597655603b6c9af720d.jpg

California nebula NGC 1499


spaceman_spiff

The California nebula (NGC 1499). Date of image 28/11/2016.

Hardware details: Camera: Canon 600D (astro modded). Telescope: SW Evostar 120 with Baader UHC-S filter. Mount: AZ-EQ6 guided using a ST80 synguider. Image details: Lights: ~40 x 3min at ISO 800, Darks: 43 x 3min at ISO 800 (taken at the end of imaging), Lights and darks all separated by 15 sec intervals. Flats: 50 x 1/350s (taken from laptop monitor screen) at ISO 800, Bias: 50 x 1/4000 at ISO 800. Temperature ~-2 to -4 deg.

Image was precessed in DSS. Stacking was in median mode. Star detection 30%. Colours have been stretched and saturation is 30%. No drizzling.

As before, the weather was excellent. No clouds and very dry on the ground. There was also no wind and the seeing was very clear - the stars were really very still that night.

Comments:

I was planning on making a mosaic of two frames to cover more of the nebula. Unfortunately the batteries on my auto guider died and I had to resort to 30 sec subs for the other stack. I don't have the darks for that, I'll get them soon!

As in previous images, I'm getting a strong gradient towards the lower end of my images. In the image of M81/82 I found that this is most likely to be caused my local lights. I could try some further processing to remove it or alter the scope to remove unwanted light. The latter seems like a more robust solution.

The Ha red shines through here giving the impression of a thin, sparse nebula that dissipates steadily into space.

Credit

D Elijah

Copyright

© D Elijah

From the album:

Photos from Bury

· 93 images
  • 93 images
  • 1 comment
  • 53 image comments

Photo Information


Recommended Comments

There are no comments to display.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.