Dwarf galaxy NGC 5477 taken by the Hubble Space Telescope.
|Observation data (J2000 epoch)|
|Right ascension||14h 05m 33.1s|
|Declination||+54° 27′ 40″|
|Helio radial velocity||317 km/s|
|Distance||20 million light years|
|Apparent magnitude (V)||14.01|
|MCG+09-23-034, VV 561, [MI94] Sm 95,
DDO 186, SPB 245, Z 272-25 [VDD93] 194, IRAS F14038+5441, TC 305, Z 1403.8+5442, KUG 1403+546, UGC 9018, [HBS84] 74,LEDA 50262, UZC J140532.8+542739, [M98c] 140347.9+544200
The M101 Group is a loose group of galaxies located in Ursa Major. The group is named after the brightest galaxy in the group, the Pinwheel Galaxy (M101). Most of the other members of the group are companions of the Pinwheel Galaxy. The group itself is one of many located within the Virgo Supercluster (i.e. the Local Supercluster).Pinwheel Galaxy
The Pinwheel Galaxy (also known as Messier 101, M101 or NGC 5457) is a face-on spiral galaxy distanced 21 million light-years (six megaparsecs) away 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 Catalogue as one of its final entries.
On February 28, 2006, NASA and the European Space Agency released a very detailed image of the Pinwheel Galaxy, which was the largest and most detailed image of a galaxy by Hubble Space Telescope at the time. The image was composed of 51 individual exposures, plus some extra ground-based photos.
On August 24, 2011, a Type Ia supernova, SN 2011fe, was discovered in M101.