|Observation data (J2000 epoch)|
|Right ascension||13h 29m 59.6s|
|Declination||+47° 15′ 58″|
|Redshift||465 ± 10 km/s|
|Distance||25 ± 3 Mly (7.7 ± 1.0 Mpc)|
|Type||Amorphous or SB0 pec|
|Apparent dimensions (V)||5′.8 × 4′.6|
|Apparent magnitude (V)||10.5|
|Messier 51b, UGC 8494, PGC 47413, Arp 85|
|See also: Galaxy, List of galaxies|
NGC 5195 (also known as Messier 51b or M51b) is a dwarf galaxy that is interacting with the Whirlpool Galaxy (also known as M51a or NGC 5194). Both galaxies are located approximately 25 million light-years away in the constellation Canes Venatici. Together, the two galaxies are one of the most famous interacting galaxy pairs.
Interaction with the Whirlpool Galaxy
NGC 5195 and the Whirlpool Galaxy comprise one of the most noted interacting galaxy pairs in astronomy. The two galaxies are listed in the Atlas of Peculiar Galaxies as one of several prominent examples of a spiral galaxy with a companion galaxy. The system was also the subject of very early theoretical investigations into galaxy interactions. The two galaxies are connected by a dust-rich tidal bridge. The dust in this tidal bridge can be seen silhouetted against the center of NGC 5195. This demonstrates that NGC 5195 appears to lie behind the Whirlpool Galaxy. The encounter has significantly enhanced the spiral structure of M51.
As a consequence of the gravitational interaction with the Whirlpool Galaxy, NGC 5195 is highly distorted. Classification of its morphology is difficult, as it is sometimes identified as a lenticular galaxy or as an amorphous or irregular galaxy. It has been described as falling outside the standard morphological classification system.
Supernova 1945A is the only supernova that has been detected within NGC 5195. The supernova was found 10″ northwest of the nucleus on April 6, 1945 by Milton L. Humason using the 100-inch (2.5 m) telescope at Mount Wilson Observatory. The supernova, classified as a Type I supernova, reached a peak apparent magnitude of 14.0.
|Wikimedia Commons has media related to Whirlpool Galaxy.|
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