NGC 4556

NGC 4556
SDSS image of NGC 4556.
Observation data (J2000 epoch)
Constellation	Coma Berenices
Right ascension	12h 35m 45.8s [1]
Declination	26° 54′ 32″ [1]
Redshift	0.024764 [1]
Heliocentric radial velocity	7424 km/s [1]
Distance	340  Mly (105  Mpc)
Apparent magnitude  (V)	13.8 [1]
Absolute magnitude  (B)	-22.89 [1]
Characteristics
Type	cD, E+ [1]
Size	~167,500  ly (51.36  kpc) (estimated) [1]
Apparent size  (V)	1.35′ × 0.93′ [1]
Other designations
UGC 07765, CGCG 159-022, MCG +05-30-027, PGC 041980 [1]

NGC 4556 is an elliptical galaxy and a cD galaxy located 340 million light-years away ^[2] in the constellation Coma Berenices. It was discovered on April 11, 1785, by astronomer William Herschel. ^[3] NGC 4556 is a member of a group of 12 galaxies known as [T2015] nest 100082, or the NGC 4555 Group, ^[4] and is part of the Coma Supercluster. ^{[5] [6]}

NGC 4556 is host to a supermassive black hole with an estimated mass of 1.1 × 10⁹ M_☉. ^[7]

See also

• Coma Supercluster

References

1. "Results for object NGC 4556". NASA/IPAC Extragalactic Database. NASA and Caltech . Retrieved 2025-07-18.
2. "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2025-07-18.
3. "New General Catalog Objects: NGC 4550 - 4599". cseligman.com. Retrieved 2025-07-18.
4. Tully, R. Brent (May 2015). "Galaxy Groups: A 2MASS Catalog". The Astronomical Journal. 149 (5): 171. arXiv: 1503.03134 . doi:10.1088/0004-6256/149/5/171. ISSN   0004-6256.
5. Gregory, S. A.; Thompson, L. A. (June 1978). "The Coma/A1367 supercluster and its environs". The Astrophysical Journal. 222: 784. doi:10.1086/156198. ISSN   0004-637X.
6. Jaffe, W.; Gavazzi, G. (February 1986). "Radio continuum survey of the coma/A1367 supercluster. II. 1.5 GHz observations of 396 CGCG galaxies". The Astronomical Journal. 91: 204–216. doi:10.1086/114001. ISSN   0004-6256.
7. Arzoumanian, Zaven; Baker, Paul T.; Brazier, Adam; Brook, Paul R.; Burke-Spolaor, Sarah; Becsy, Bence; Charisi, Maria; Chatterjee, Shami; Cordes, James M.; Cornish, Neil J.; Crawford, Fronefield; Cromartie, H. Thankful; Decesar, Megan E.; Demorest, Paul B.; Dolch, Timothy (2021-06-01). "The NANOGrav 11 yr Data Set: Limits on Supermassive Black Hole Binaries in Galaxies within 500 Mpc". The Astrophysical Journal. 914 (2): 121. arXiv: 2101.02716 . Bibcode:2021ApJ...914..121A. doi: 10.3847/1538-4357/abfcd3 . ISSN   0004-637X.