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© D Elijah
Credit Please credit D Elijah if you are using this image.

Star field near Cocoon neb


Date of image 17/07/2016

Star field near the Cocoon Nebula. Centre of picture: RA 21h, 51', 57.77''; DEC +48, 39', 0.01''. Processed using DSS. 

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: 25 x 3min at ISO 800, Darks: 50 x 3min 0 sec at ISO 800 (from dark library), Lights and darks separated by 30 sec intervals. Flats: 50 x 1/50s at ISO 800, Bias: 50 x 1/4000 at ISO 100.

I was trying to capture the Cocoon nebula but got confused by a set of stars that looked like the stars at the centre of the nebula. I was about 1 degree higher in declination from the target.

Atmospheric transparency was good, no clouds. Auto guiding was reasonably stable.

I increased the saturation by 30% and manually aligned the colour channel histograms. I stretched the red, green and blue channels by about the same amount to try and show the subtle difference in colour.


Please credit D Elijah if you are using this image.


© D Elijah

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