Ausschnitt im Sternbild

M101 Galaxy

Spiral galaxy in the constellation Ursa Major.

Messier 101 (also known as NGC 5457, Pinwheel Galaxy or Firewheel Galaxy) is a spiral galaxy with the apparent brightness of 7.5 mag in the constellation Ursa Major.

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Object: M101
Date of exposures: 13.05.2018, 14.05.2018, 23.05.2018, 31.03.2020
Distance: 22 Mio. Lightyears
Exposures: Lum: 630 x 15 Sec., 142 x 180 Sec., RGB: 66 x 180 Sec., Sum: 12,0 hrs.
Telescope: 10'', F4 Newton
Focal length: 1000mm
Filter: Astrodon E-Series, LRGB
Camera: ASI 1600 MMC Pro
Guiding: Off Axis Guider, Lodestar
Mount: EQ8

Their distance is about 22 million lightyears, their diameter 170,000 Lj. M 101 has five prominent accompanying galaxies: NGC 5204, NGC 5474, NGC 5477, NGC 5585 and Holmberg IV.

Messier 101 was discovered on 27 March 1781 by the French astronomer Pierre Méchain. Various bright nodes of M 101, which are H-II areas and/or star clouds, can be found under a separate entry in the NGC. On 24 August 2011, a type Ia supernova was discovered in M101, which was named SN 2011fe.