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| NGC 4200 | |
|---|---|
 SDSS image of NGC 4200 | |
| Observation data (J2000epoch) | |
| Constellation | Virgo |
| Right ascension | 12h 14m 44.225s[1] |
| Declination | +12° 10′ 50.70″[1] |
| Redshift | 0.00781[1] |
| Heliocentric radial velocity | 2332 km/s[1] |
| Distance | 79 Mly (24.2 Mpc)[2] |
| Characteristics | |
| Type | S0[3] |
| Size | 1.445′[2] |
| Other designations | |
| UGC 7251,MCG +02-31-057,PGC 39124[1] | |
NGC 4200 is a small lenticular galaxy located in theconstellation ofVirgo. NGC 4200 was discovered by the German-British astronomerWilliam Herschel in 1784.[4]
According to A.M. Garcia, NGC 4200 is one of the many galaxies in the M49 group (127 in total), which he described in an article published in 1993. This list includes 63 galaxies from the New General Catalogue , including NGC 4382 (M85), NGC 4472 (M49), NGC 4649 (M60), as well as 20 galaxies from the Index Catalogue.[5]
On the other hand, NGC 4423 also appears in a list of 227 galaxies in an article published by Abraham Mahtessian in 1998. This list includes more than 200 galaxies from the New General Catalogue and about fifteen galaxies from the Index Catalogue. Ten other galaxies from the Messier Catalogue are also found in this list: M49,M58, M60,M61, M85,M87,M88,M91,M99, andM100.[6]
Not all the galaxies in Mahtessian's list actually constitute a single galaxy group. Rather, they are several groups of galaxies, all part of a galaxy cluster, theVirgo Cluster. To avoid confusion with the Virgo Cluster, this collection of galaxies can be called the M60 Group, as M60 is one of the brightest galaxies on the list. The Virgo Cluster is indeed much larger and is estimated to contain around 1,300 galaxies, and possibly more than 2,000, located at the core of theVirgo Supercluster, which includes theLocal Group.[7][8][9]
Many galaxies in Mahtessian's list are found in eleven groups described in the article by AM Garcia, namely theNGC 4123 group (7 galaxies), theNGC 4261 group (13 galaxies), theNGC 4235 group (29 galaxies), the M88 group (13 galaxies, M88 = NGC 4501), the NGC 4461 group (9 galaxies), the M61 group (32 galaxies, M61 = NGC 4303), the NGC 4442 group (13 galaxies), the M87 group (96 galaxies, M87 = NGC 4486), the M49 group (127 galaxies, M49 = NGC 4472), theNGC 4535 group (14 galaxies) and theNGC 4753 group (15 galaxies). These eleven groups are part of the Virgo Cluster and contain 396 galaxies. However, some galaxies from Mahtessian's list do not appear in any of Garcia's groups, and vice versa.[10]
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