Q1113093

galaxy

Astronomical data · SIMBAD

Object type: Sy1
Distance: 1,229 light-years
Redshift: z = 0.0032776351913594848
Morphology: SA_B
Coordinates: RA 190.7182° · Dec 13.2574°

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Key facts

Constellation: Virgo
Right ascension: 12 42 52.37814
Declination: +13 ° 15 ′ 26.7129 ″
Heliocentric radial velocity: 989 km/s
Distance: 72.02 ± 0.23 Mly (22.08 ± 0.07 Mpc )
Group or cluster: Virgo Cluster
Type: SAB(rs)bc
Apparent size v: 2′.8 × 1′.9
Notable features: Seyfert type 1

via Wikipedia infobox

Wikidata facts

Distance from Earth: 20
Image: NGC 4639.jpg

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catalog code: LEDA 42741
Commons category: NGC 4639
time of discovery or invention: 1784-04-12
apparent magnitude: 8.805
galaxy morphological type: Sb
right ascension: 190.71824224840790
declination: 13.25742025813510
radial velocity: 1089
redshift: 0.00364

Sources (1)

wikidata.org

via Wikidata · CC0

~2 min read

Article

NGC 4639 is a barred spiral galaxy located in the equatorial constellation of Virgo. It was discovered by German-born astronomer William Herschel on 12 April 1784. John L. E. Dreyer described it as "pretty bright, small, extended, mottled but not resolved, 12th magnitude star 1 arcmin to southeast". This is a relatively nearby galaxy, lying approximately 72 million light-years away from the Milky Way. It is a companion to NGC 4654, and the two appear to have interacted roughly 500 million years ago. NGC 4639 is a member of the Virgo Cluster.

The morphological classification of this galaxy is SAB(rs)bc, 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. There is a supermassive black hole at the core with an estimated mass of 7.9×10 M☉.