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.
|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|
|Filter:||Astrodon E-Series, LRGB|
|Camera:||ASI 1600 MMC Pro|
|Guiding:||Off Axis Guider, Lodestar|
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.