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Contains:  NGC 5477, NGC 5473, M 101, NGC 5457
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M101, The pinwheel galaxy, 


            Steven Bellavia
M101, The pinwheel galaxy

M101, The pinwheel galaxy

Technical card

Resolution: 4200x2800

Dates:June 23, 2019

Frames:IDAS UIBAR-III: 39x120" (gain: 100.00) -15C bin 1x1

Integration: 1.3 hours

Darks: ~25

Flats: ~30

Flat darks: ~30

Avg. Moon age: 20.45 days

Avg. Moon phase: 67.72%

Bortle Dark-Sky Scale: 4.00

Mean SQM: 21.50

Mean FWHM: 4.50

Temperature: 15.00 job: 2760537

RA center: 14h 3' 12"

DEC center: +54° 22' 19"

Pixel scale: 1.360 arcsec/pixel

Orientation: 1.894 degrees

Field radius: 0.953

Data source: Traveller


The Pinwheel Galaxy, M101 (NGC 5457) is a face-on spiral galaxy 21 million light-years from Earth in the constellation Ursa Major. Discovered by Pierre Méchain on March 27, 1781, it was communicated to Charles Messier who verified its position for inclusion in the Messier Catalog as one of its final entries.
The giant spiral disk of stars, dust and gas is 170,000 light-years across — nearly twice the diameter of our galaxy, the Milky Way. M101 is estimated to contain at least one trillion stars. The galaxy’s spiral arms are sprinkled with large regions of star-forming nebulae. These nebulae are areas of intense star formation within giant molecular hydrogen clouds. Brilliant, young clusters of hot, blue, newborn stars trace out the spiral arms.
M101 has an apparent magnitude of 7.9. It can be spotted through a small telescope and is most easily observed during April.



Steven Bellavia
License: None (All rights reserved)

Sky plot

Sky plot


M101, The pinwheel galaxy, 


            Steven Bellavia