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Contains:  NGC 891
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NGC 891, 





    
        

            Daniel.P
NGC 891

NGC 891

Technical card

Resolution: 3040x2024

Dates:Oct. 31, 2016

Frames: 5x900" -15C bin 1x1

Integration: 1.2 hours

Darks: ~7

Bias: ~50

Avg. Moon age: 0.69 days

Avg. Moon phase: 0.53%

Mean SQM: 20.90

Mean FWHM: 3.30

Astrometry.net job: 1322936

RA center: 35.650 degrees

DEC center: 42.348 degrees

Pixel scale: 0.701 arcsec/pixel

Orientation: -97.410 degrees

Field radius: 0.355 degrees

Locations: Duc, Prayssas, Lot et Garonne, France

Description

A short work on NGC 891. I was not so successful mainly due to poor mount balance.
It is important that there is some mount "unbalance", in this instance in DEC, to prevent the mount "floating" under the influence of a weak wind. I tried with and without AO, but in both case the system struggled to much to track.

3 subs with AO "off" and 2 subs "on"

Pre-processing done in Pixinsight :
- overscan area offset correction
- bias correction
- dark correction using 7 x 1800 s darks
- hot pixel correction
- debayer
- registration
- stack
Processing done in Pixinsight :
- backgroung color neutralisation
- color calibration using galaxy
- sky background removal (DBE in PI)
- slight deconvolution
- non linear image creation
- color saturation boost masked
- green neutral
- TGV denoise (no mask)
Final image :
- jpeg calibration done in Mac Photo (levels adjust and further saturation boost and color balance)

Comments

Author

Daniel.P
Daniel.P
License: None (All rights reserved)
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NGC 891, 





    
        

            Daniel.P