Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5422  ·  NGC 5457  ·  NGC 5473  ·  NGC 5474  ·  NGC 5477
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Pinwheel Galaxy - 6/17/2010, 


Pinwheel Galaxy - 6/17/2010
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Pinwheel Galaxy - 6/17/2010

Technical card

Imaging telescopes or lenses: Stellarvue SV105

Mounts: Takahashi EM-200 Temma2

Guiding telescopes or lenses: Orion ST 80

Software: PHD guiding  ·  PixInsight  ·  Nebulosity

Filters: Hutech IDAS LPS P2 2"

Dates:May 2, 2010

Frames:Hutech IDAS LPS P2 2": 25x10" (gain: 1.00) -5C bin 1x1

Integration: 0.1 hours

Avg. Moon age: 18.79 days

Avg. Moon phase: 82.78%

Basic astrometry details

Astrometry.net job: 147725

RA center: 14h 3' 10"

DEC center: +54° 21' 39"

Pixel scale: 3.512 arcsec/pixel

Orientation: -91.660 degrees

Field radius: 1.105 degrees

Resolution: 620x388


The Pinwheel Galaxy (Messier Object 101) is a spiral type galaxy about twice the size of our own Milky Way probably containing well over 200 billion stars. M101 is approximately 170,000 lightyears from edge to edge. Of particular note are the red/pink blotches in the arms of the galaxy. These areas are called H II regions and are indicative of stellar nurseries where new stars are born). The dense hydrogen gas is energized by nearby young and energetic stars and emits color in the red frequency when excited.

In the upper left, NGC 5474 is visible. This companion galaxy would have probably been classified as a well-formed spiral type, but the massive gravitational pull of nearby M101 has caused massive deformations and irregularities in the structure.

M101 is located some 24 million lightyears distant and is found in the constellation Ursa Major (Big Dipper).


Sky plot

Sky plot


Pinwheel Galaxy - 6/17/2010,