A Hubble Space Telescope (HST) image of NGC 4639.[1]
Observation data (J2000 epoch)
Constellation
Virgo
Right ascension
12h 42m 52.37814s[2]
Declination
+13° 15′ 26.7129″[2]
Heliocentric radial velocity
989 km/s[3]
Distance
72.02 ± 0.23 Mly (22.08 ± 0.07 Mpc)[3]
Group or cluster
Virgo Cluster
Apparent magnitude (V)
12.2[4]
Characteristics
Type
SAB(rs)bc[5]
Apparent size (V)
2′.8 × 1′.9[4]
Notable features
Seyfert type 1
Other designations
IRAS 12403+1331, LEDA 42741, MCG+02-32-189, NGC 4639, UGC 7884, VCC 1943,[6] PGC 42741[4]
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NGC 4639 is a barred spiral galaxy located in the equatorial constellation of Virgo. It was discovered by German-born astronomer William Herschel on April 12, 1784. John L. E. Dreyer described it as "pretty bright, small, extended, mottled but not resolved, 12th magnitude star 1 arcmin to southeast".[7] This is a relatively nearby galaxy,[8] lying approximately 72 million light-years away from the Milky Way.[3] It is a companion to NGC 4654, and the two appear to have interacted roughly 500 million years ago.[9] NGC 4639 is a member of the Virgo Cluster.[10]
The morphological classification of this galaxy is SAB(rs)bc,[5] indicating a spiral galaxy with a weak bar (SAB), an incomplete ring around the bar (rs), and moderate to loosely-wound spiral arms (bc). NGC 4639 has a mildly active galactic nucleus of the Seyfert type 1; one of the weakest known. The compact central source has been detected by its X-ray emission, and is variable on timescales of months to years.[8] There is a supermassive black hole at the core[11] with an estimated mass of 7.9×106M☉.[12]
Two supernovae have been observed in NGC 4639. The classical Type Ia Supernova SN 1990N was discovered in this galaxy on June 22, 1990, two weeks before reaching peak brightness.[13] It was positioned 63.2″ east and 1.8″ south of the galaxy core.[14] The brightness and proximity of this supernova event has allowed it to be used as a standard candle.[13] SN 2018imf (type IIP, mag. 15.7) was discovered on 14 November, 2018.[15]
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^Transient Name Server entry for SN 2018imf. Retrieved 23 March 2023.
NGC4639 is a barred spiral galaxy located in the equatorial constellation of Virgo. It was discovered by German-born astronomer William Herschel on April...
distribution of its stars. It has been proposed that NGC 4654 interacted with its neighbor the spiral galaxy NGC4639 about 500 million years ago; this, combined...
691, NGC 7678, NGC 2442, NGC 5468, NGC 5917, NGC4639, NGC 3972, The Antennae Galaxies, NGC 5584, M106, NGC 7250, NGC 3370, NGC 5728, NGC 4424, NGC 1559...
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Herschel and later led to the entry NGC 405 in the New General Catalogue. "NASA/IPAC Extragalactic Database". Results for NGC 405. Archived from the original...
NGC 4701 is an unbarred spiral galaxy in the New General Catalogue, located in the constellation Virgo. It was discovered by the English astronomer William...
NGC 4614 is a barred lenticular galaxy in the New General Catalog. It is located in the constellation of Coma Berenices. It was discovered in 1864 by...
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