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M101 The Pinwheel Galaxy in LRGB + HA | by Terry Hancock
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M101 The Pinwheel Galaxy in LRGB + HA

Added 2 hours of Hydrogen Alpha


Luminance + RGB + HA over 7 nights using the QHY9 on the AT10RC Total Exposure time 16 hours


Image Details

Location: DownUnder Observatory, Fremont MI

Date of Shoot 14th, 17th, 21st, 26th and 27th, 30th March and April 3rd 2012

26 x 15 min luminance binned 2x2

10 x 15 min each RGB binned 2x2

6 x 15 min Hydrogen Alpha @ 10nm binned 2x2

Camera: QHY9M monochrome CCD

StarlightXpress Color Filter Wheel

Scope: Astronomy Technologies Astro-Tech 10" f/8 Ritchey-Chrétien astrograph

Astro Tech 2" Field Flattener.

Autoguided using QHY5 autoguider, StarlightXpress Ultra Slim Off Axis guider

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

Image Aquisition software Maxim DL5

Stacking software Deep sky Stacker

Registered with Registar

Post Processed with Photoshop CS5


The Pinwheel Galaxy also known as Messier 101 or NGC 5457 a face-on spiral galaxy at a distance of 21 million light-years away in the constellation Ursa Major

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Taken on April 5, 2012