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Intermediate spiral galaxy in the constellation Coma Berenices From Wikipedia, the free encyclopedia
Messier 98, M98 or NGC 4192, is an intermediate spiral galaxy about 44.4[3] million light-years away in slightly northerly Coma Berenices, about 6° to the east of the bright star Denebola (Beta Leonis). It was discovered by French astronomer Pierre Méchain on 1781,[lower-alpha 1] along with nearby M99 and M100, and was catalogued by compatriot Charles Messier 29 days later in his Catalogue des Nébuleuses & des amas d'Étoiles.[5] It has a blueshift, denoting ignoring of its fast other movement (vectors of proper motion), it is approaching at about 140 km/s.[2]
Messier 98 | |
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![]() Galaxy Messier 98 by ESO New Technology Telescope | |
Observation data (J2000 epoch) | |
Constellation | Coma Berenices |
Right ascension | 12h 13m 48.292s[1] |
Declination | +14° 54′ 01.69″[1] |
Redshift | −0.000474[2] |
Heliocentric radial velocity | −142 ± 4 km/s[2] |
Distance | 44.4 million light years (13.6 Mpc)[3] |
Apparent magnitude (V) | 10.1[4] |
Characteristics | |
Type | SAB(s)ab[3] |
Apparent size (V) | 9′.8 × 2′.8[5] |
Other designations | |
NGC 4192, UGC 7231, PGC 39028[2] |
The morphological classification of this galaxy is SAB(s)ab,[3] which indicates it is a spiral galaxy that displays mixed barred and non-barred features with intermediate to tightly wound arms and no ring.[6] It is highly inclined to the line of sight at an angle of 74°[7] and has a maximum rotation velocity of 236 km/s.[8] The combined mass of the stars in this galaxy is an estimated 76 billion (7.6 × 1010) times the mass of the Sun. It contains about 4.3 billion solar masses of neutral hydrogen and 85 million solar masses in dust.[9] The nucleus is active, displaying characteristics of a "transition" type object. That is, it shows properties of a LINER-type galaxy intermixed with an H II region around the nucleus.[10]
Messier 98 is a member of the Virgo Cluster, which is a large cluster of galaxies, part of the local supercluster.[11]
About 750 million years ago, it may have interacted with the large spiral galaxy Messier 99. These are now separated by 1,300,000 ly (400,000 pc).[8]
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