M 101 - Pinwheel Galaxy

Show astrometry data

M101, the Pinwheel Galaxy, is a face-on spiral galaxy approximately 21 million light years from Earth. The galaxy is approximately the same size as our own Milky Way Galaxy (170,000 light years in diameter). Discovered in 1781, it became one of the final entries into the Messier Catalog.

This image was taken with our Planewave 17" telescope and FLI PL16803 camera in Texas, and comprises more than 21 hours of LRGB data. 3 hours of narrowband data has been added to enhance Hydrogen Alpha regions within the galaxy's arms. Processed in Thailand using PixInsight and Photoshop.

Data collected at the Dark Sky Observatory Collaborative (DSOC) in Ft. Davis, TX using SC Observatory's remote Planewave CDK 17" f/6.8 scope, in collaboration with:

John Kasianowicz, Josh Balsam, Mike Selby, Dhaval Brahmbhatt, Scott Johnson, Mike Bushell, Rich Johnson

Image processing: Andy Chatman and Stefan Schmidt

Object details

Galaxy in Ursa Major

Right Ascension: 14h 03m 12.6s

Declination: +54° 20′ 57″

Magnitude: 7.88

Moon Age Average: 20.83 days

Moon Phase Average: 55.95 %

Imaging Setup


Fort Davis, Texas, USA

Apr 18, 2017, Apr 19, 2017, Apr 20, 2017, Apr 21, 2017, Apr 22, 2017, Apr 23, 2017, May 19, 2017, Jun 17, 2017, Dec 31, 2017, Jan 2, 2018 and Jan 6, 2018
Planewave CDK 17
Focal Length:
2924 mm
Astrophysics 1100GTO
FLI PL 16803
Image Scale:
1.27 arcseconds/pixel
Imaging Software:


Processing Software:

Adobe Photoshop

PixInsight 1.8

Exposure Detail

Filter Filter Brand Bin Qty Exposure
L Astrodon 2x 29 1200
R Astrodon 2x 11 1200
G Astrodon 2x 12 1200
B Astrodon 2x 12 1200
Ha Astrodon 2x 9 1200

Total Exposure Time

24 hours, 20 minutes

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