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|Observation data (J2000 epoch)|
|Right ascension||15h 10m 56.1s|
|Declination||+05° 44′ 41″|
|Redshift||23370 ± 30 km/s|
|Number of stars||100 trillion (1014)|
|Apparent dimensions (V)||1'.2 × 0'.6|
|Apparent magnitude (V)||14.7|
|UGC 9752, PGC 54167|
The galaxy is classified as a supergiant elliptical (E) to lenticular (S0) and is the brightest galaxy in A2029 (hence its other designation A2029-BCG; BCG meaning Brightest cluster galaxy). The galaxy's morphological type is debated due to its possibility being shaped like a flat disc, but only seen from Earth at a different angle. However, most lenticulars have sizes ranging from 50,000 to 120,000 light-years. If IC 1101 is a lenticular galaxy, it would be the largest ever detected.
Like most large galaxies, IC 1101 is populated by a number of metal-rich stars, some of which are seven billion years older than the Sun, making it appear golden yellow in color. It has a bright radio source at the center, which is associated with a massive black hole.
The galaxy was discovered on June 19, 1790 by the British astronomer Frederick William Herschel I. It was catalogued in 1895, or more than 100 years later, by John Louis Emil Dreyer as the 1,101st object of the Index Catalogue of Nebulae and Star Clusters (IC). At its discovery, it was identified as a nebulous feature. Following Edwin Hubble's 1932 discovery that some of the "nebulous features" were actually independent galaxies, subsequent analysis of objects in the sky were conducted and IC 1101 was therefore found to be one of the independent galaxies.
- "NASA/IPAC Extragalactic Database". Results for IC 1101. Retrieved 2006-11-11.
- "Data for IC 1101". SIMBAD Astronomical Database.
- Uson, Juan M.; Boughn, Stephen P.; Kuhn, Jeffrey R. (October 1990). "The central galaxy in Abell 2029 - an old supergiant". Science 250 (4980): 539–540. Bibcode:1990Sci...250..539U. doi:10.1126/science.250.4980.539.
- Wilford, John Noble (1990-10-26). "Sighting of Largest Galaxy Hints Clues on the Clustering of Matter". New York Times. Retrieved 2010-05-06.
- IC 1101 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
- The Scale of the Universe (Astronomy Picture of the Day 2012 March 12)
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