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Contains:  M 31, Great Nebula in Andromeda, NGC 224, M 32, NGC 221, M 110, NGC 205, The star νAnd, The star 32And
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Andromeda Galaxy (Messier 31), 





    
        

            Miles Zhou
Andromeda Galaxy (Messier 31)

Technical card

Resolution: 3317x1943

Dates:Dec. 18, 2012

Frames: 46x180"

Integration: 2.3 hours

Avg. Moon age: 5.68 days

Avg. Moon phase: 32.25%

Astrometry.net job: 164339

RA center: 11.026 degrees

DEC center: 41.421 degrees

Pixel scale: 4.501 arcsec/pixel

Orientation: -93.964 degrees

Field radius: 2.403 degrees

Description

Andromeda Galaxy taken by NSP of Xingming Observatory, in combination with Mr. Maosheng Chen's originals (detailed below).
Exposure Total 46x180s at ISO 800; from which, 24 are acquired by Maosheng Chen. Thanks for Maosheng's generous offer.
Processing IRIS:
Stacking; two baches separately stacked, and added by an optimized ratio as discussed in Stacking_of_Two_Images (http://orianhealth.com/mediawiki/index.php?title=Stacking_of_Two_Images).
MaximDL: MaximDL generates two layers: the nebulocity and star layers.
Nebulocity layer: Erode (3x3) --> DDP --> Gaussion (1.5)
Star layer: A simple stretch
PS: Blending the nebulocity and star layers by Ligher; and a high pass layer blended by Overlay. Finally, some final touch (Color balance, brightness and contrast).
Two PS operations greatly improved the quality
1. High-pass layer blended by overlay (or alternatively, by Soft Light or other lightening blending modes)
2. Gaussion blur on the nebulocity layer.

Comments

Author

mileszhou
Miles Zhou
License: None (All rights reserved)
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Andromeda Galaxy (Messier 31), 





    
        

            Miles Zhou