Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5422  ·  NGC 5457  ·  NGC 5473  ·  NGC 5474  ·  NGC 5477  ·  NGC 5485  ·  NGC 5486
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M 101: Pinwheel Galaxy, 


            José J. Chambó
M 101: Pinwheel Galaxy
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Technical card

Imaging telescopes or lenses: Meade ETX-70

Imaging cameras: Canon EOS 350D / Digital Rebel XT

Mounts: LXD75

Guiding telescopes or lenses: Bresser Skylux 70/700

Guiding cameras: Human Hand-guided

Software: DeepSkyStacker  ·  PixInsight LE

Dates:April 9, 2010

Frames: 10x270" (45') ISO1600

Integration: 45'

Darks: ~5

Flats: ~10

Bias: ~13

Avg. Moon age: 24.90 days

Avg. Moon phase: 22.36%

Bortle Dark-Sky Scale: 3.00

Mean SQM: 20.80

Basic astrometry details

Astrometry.net job: 116613

RA center: 14h 3' 34"

DEC center: +54° 19' 48"

Pixel scale: 6.417 arcsec/pixel

Orientation: 92.795 degrees

Field radius: 1.077 degrees

Resolution: 620x388

Locations: Hoya Redonda - Valencia (Spain), Enguera, Valencia, Spain


The Pinwheel Galaxy (M 101) is a spiral galaxy located in constellation of Ursa Major. To a distance of 27 millions light-years is one of near galaxies bigger (twice that our Milky Way) wich is extendend with a aparent diameter nearly moon size, but its dispersed arms do that only can be observed through powerful telescopes. Between others, is accompanied by galaxies NGC 5422 (at top left), NGC 5473 (at left), NGC 5485 and NGC5486 (at bottom left), NGC 5477 (at bottom) and NGC 5474 (at bottom right).

More info into the Blog  C O M E T O G R A F I A(in Spanish)


Sky plot

Sky plot


M 101: Pinwheel Galaxy, 


            José J. Chambó