Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5447  ·  NGC 5449  ·  NGC 5450  ·  NGC 5451  ·  NGC 5453  ·  NGC 5455  ·  NGC 5457  ·  NGC 5461  ·  NGC 5462  ·  NGC 5471  ·  NGC 5477  ·  Pinwheel galaxy
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The Pinwheel Galaxy (Messier 101), Luca Marinelli
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The Pinwheel Galaxy (Messier 101)

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The Pinwheel Galaxy (Messier 101), Luca Marinelli
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The Pinwheel Galaxy (Messier 101)

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Description

The Pinwheel Galaxy (M101) is a face-on spiral galaxy, 23 million light years from Earth in the constellation Ursa Major.

M101 has a high population of H II regions, many of which are very large and bright. H II regions usually accompany the enormous clouds of high density molecular hydrogen gas contracting under their own gravitational force where stars form. H II regions are ionized by large numbers of extremely bright and hot young stars; those in M101 are capable of creating hot superbubbles. In a 1990 study, 1264 H II regions were cataloged in the galaxy. Three are prominent enough to receive New General Catalogue numbers - NGC 5461, NGC 5462, and NGC 5471. (source: Wikipedia)

ZWO ASI1600 MM Pro

LRGB data: Gain 76, Offset 30

Ha data: Gain 139, Offset 50

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The Pinwheel Galaxy (Messier 101), Luca Marinelli