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Contains:  Crescent nebula, NGC 6888
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Crescent Nebula, 


            Tony Cook
Crescent Nebula
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Crescent Nebula

Technical card

Imaging telescopes or lenses: ASA N10 astrograph

Imaging cameras: canon 450D

Mounts: 10 Micron 1000 HPS

Focal reducers: ASA 3" Wynne Corrector 0.95x

Software: Russle Croman GradientXTerminator  ·  Noel Carbonni Astrotools  ·  Mike Unsold Images Plus  ·  Photoshop CS 2

Dates:Sept. 18, 2015

Frames: 87x240" ISO800

Integration: 5.8 hours

Darks: ~157

Flats: ~103

Flat darks: ~101

Avg. Moon age: 4.68 days

Avg. Moon phase: 22.83%

Mean SQM: 20.78

Temperature: 6.00

Basic astrometry details job: 790349

RA center: 20h 12' 14"

DEC center: +38° 21' 10"

Orientation: 93.582 degrees

Field radius: 0.765 degrees

Resolution: 3852x2564

Locations: Dark Sky Site, Kirby Malzeard, North Yorkshire, United Kingdom


Now that September skies are dark and longer I've now started to work up experience with the ASA N10 astrograph by imaging the Crescent Nebula.

One major problem I've still to iron out is inevitable lens fogging with the Wynne Corrector. There appears to be no reasonable way to fit a lens heating tape as you have the whole mass of the focuser to deal with minimum thermal contact to the draw tube via 6 rollers!

Revision B: Added some deconvolution to counter poor seeing - via Images Plus Adaptive Richardson-Lucy restoration - 5x5 Gaussian PSF - 10 iterations in centre and 5 in the outer area



Tony Cook
License: Attribution-NonCommercial-NoDerivs Creative Commons


  • Final
    Crescent Nebula, 


            Tony Cook

Sky plot

Sky plot


Crescent Nebula, 


            Tony Cook

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