M101 - Pinwheel Galaxy (NASA description)                                    (click image for full-scale)

Distance:  23 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 19x10min L (bin1x1); 4x5min ea RGB (bin2x2); AstroArt5, CS4 (slightly cropped, 10xdarks/flats/bias)

13 February 2013 - Las Cruces, NM  (re-processed on 2 Mar 2019 - old version is here)

Published as Astronomy Magazine Picture of the Day, 21 Nov 19 (NOTE: NASA defines M101 as "The Pinwheel Galaxy").

Copyright  Jeffrey O. Johnson

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