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M51
Whirlpool
Galaxy
M51,  The Whirlpool Galaxy

Date:  June 15, 16, 19, 2012

Cameras: SBIG STL6303E(Clear); STL11k(RGB)
Filters:  AstroDon Clear, R, G, B filters
Camera control software:  CCDSoft/MaximDL
Guiding/adaptive optics:  internal autoguider
Camera temperature:  -10C

Telescope:  RCOS 24(Clear) PlaneWave CDK24(RGB)
Telescope control software:  TheSkyX/ RCOS TIM, PlaneWave telescope control interface
Mount:  RCOS Equatorial Fork Mount/PlaneWave Ascension 200HR Equatorial Mount

Subexposures:
Luminance: 17 x 10 minute (unbinned)
RGB: 6x10min each RGB (binned 2x2)

Processing: CCDStack2, Photoshop CS6
Click here for 2005 image.
Click above for 2100x1395
Below:
Luminance and LRGB versions stretched to show
outer envelope details.