NGC 7674
Galaxy NGC 7674 |
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NGC7674 (m) & “NGC 7674A” (u) with LEDA 71507 ( Hubble space telescope ). | |
AladinLite | |
Constellation | Pegasus |
Position equinox : J2000.0 , epoch : J2000.0 |
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Right ascension | 23 h 27 m 56.7 s |
declination | + 08 ° 46 ′ 45 ″ |
Appearance | |
Morphological type | SA (r) bc / pec / HII / Sy2 |
Brightness (visual) | 13.1 mag |
Brightness (B-band) | 13.9 likes |
Angular expansion | 1.1 ′ × 1 ′ |
Position angle | 150 ° |
Surface brightness | 13.1 mag / arcmin² |
Physical data | |
Affiliation | HCG 96 WBL 716 |
Redshift | 0.028924 ± 0.000030 |
Radial velocity | (8671 ± 9) km / s |
Stroke distance v rad / H 0 |
(394 ± 28) · 10 6 ly (120.8 ± 8.5) Mpc |
history | |
discovery | John Herschel |
Discovery date | August 16, 1830 |
Catalog names | |
NGC 7674 • UGC 12608 • PGC 71504 • CGCG 406-112 • MCG + 01-59-080 • IRAS 23254 + 0830 • KUG 2325 + 085 • 2MASX J23275670 + 0846443 • Arp 182 • HCG 96A • VV 343a • GC 4968 • h 2243 • GALEX ASC J232756.81 + 084644.9 |
NGC 7674 is an active bar-spiral galaxy with extensive star formation regions of the Hubble type SBbc in the constellation Pegasus in the northern sky . It is an estimated 394 million light years away from the Milky Way and about 130,000 light years in diameter. Together with PGC 71505 ( NGC 7674A ) it forms the interacting galaxy pair Arp 182 and together with NGC 7675 and PGC 71507 the galaxy quartet HCG 96 .
Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class of narrow filament galaxies .
In September 2017, a double supermassive black hole was observed here using Very Long Baseline Interferometry (VLBI). These are two objects orbiting each other at a distance of 1.1 light years with a total mass of 36 million solar masses .
The object was discovered by John Herschel on August 16, 1830 .
literature
- Jeff Kanipe and Dennis Webb: The Arp Atlas of Peculiar Galaxies - A Chronicle and Observer's Guide , Richmond 2006, ISBN 978-0-943396-76-7