|Right ascension||10h 47m 49.6s|
|Declination||+12° 34′ 54″|
|Redshift||911 ± 2 km/s|
|Distance||32.0 ± 1.6 Mly (9.8 ± 0.5 Mpc)|
|Apparent dimensions (V)||5′.4 × 4′.8|
|Apparent magnitude (V)||10.2|
|NGC 3379, UGC 5902, PGC 32256|
|See also: Galaxy, List of galaxies|
Messier 105 was discovered by Pierre Méchain on 24 March 1781, just a few days after he discovered the nearby galaxies Messier 95 and Messier 96. This galaxy is one of several that were not originally included in the original Messier Catalogue compiled by Charles Messier. Messier 105 was included in the catalog only when Helen S. Hogg found a letter by Méchain describing Messier 105 and when the object described by Méchain was identified as a galaxy previously named NGC 3379.
Messier 105 is known to have a supermassive black hole whose mass is estimated to be between 1.4*108 and 2*108 solar masses. It also contains a few young stars and stellar clusters, suggesting some elliptical galaxies still form new stars, but very slowly.
Galaxy group information
This galaxy, along with its companion the barred lenticular galaxy NGC 3384, is surrounded by a large ring of neutral hydrogen with a radius of 200 kiloparsecs (650,000 light years) and a mass of 1,8*109 times the mass of the Sun where star formation has been detected.
- Messier 105 on Articles and images
- "StarDate: M105 Fact Sheet"
- SEDS: Elliptical Galaxy M105
- ESA/Hubble image of M105
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