M51 - Whirlpool Galaxy       (image above is reduced-size crop | other sizes:  medium , original)

Distance:  30 million light years

Telescope Takahashi TOA-130F @ f/7.7
Mount Takahashi EM200 Temma II
Camera QSI 540wsg @ -15C
Filters Astrodon Tru-Balance I-Series LRGB Gen 2
Guider SX Lodestar
Settings 12x15min,7x10min L (bin1x1); 6x5min ea RGB (bin2x2); AstroArt5, CS4 (slightly cropped, 10xdarks/flats/fdarks/bias)

14 March 2013 - Las Cruces, NM

Published in One Minute Astronomer, 16 Apr 13.

Process notes:  My special thanks to Leonardo Orazi for sharing his knowledge on improved RGB processing with me!

Copyright  Jeffrey O. Johnson

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