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M31 Andromeda Galaxy LRGB | by Terry Hancock
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M31 Andromeda Galaxy LRGB

I'm not quite sure if it took me longer to shoot this or to process :)

To enhance core detail and prevent burn out I used 2 minute combined with 5 and 10 minute exposures for the luminance, 5 and 10 minute exposures for the RGB combined with 15 minute exposures with the QHY9C one shot color CCD.


Total Exposure Time 15 hours.


Clear Skies


Down Under Observatory

Down Under Observatory on Facebook



Image Information

Location: DownUnder Observatory, Fremont MI

Date of Shoot August 12, 21, 22nd 2012


QHY9M mono CCD


RGB 6 x 5 min, 9 x 10 min

26 x 2 min

23 x 5 min

18 x 10 min

QHY9C one shot color CCD

13 x 15 min

all sub exposures un binned.


Camera: QHY9M monochrome CCD & QHY9C one shot color CCD, cooled to -30C

StarlightXpress Color Filter Wheel

Scope: Thomas M. Back TMB 92SS F5.5 APO Refractor

Astro Tech AT2FF Field Flattener

For guiding: StarlightXpress Lodestar autoguider, StarlightXpress Ultra Slim Off Axis guider

Paramount GT-1100S German Equatorial Mount (with MKS 4000)

Image Aquisition software Maxim DL for the Mono CCD and Nebulosity II for the OSC

Stacking software Deep Sky Stacker for the OSC and CCDStack for the Mono CCD

Registration of images with Registar

Post Processing Photoshop CS5


Coming up for the grand finale LRGB + H-Alpha version.


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Taken on August 27, 2012