IC 1101

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IC 1101
IC 1101, telescope image.jpg
Photometric image of IC 1101, by David A. Aguilar (CfA)
Observation data (J2000 epoch)
Constellation Virgo
Right ascension 15h 10m 56.1s[1]
Declination +05° 44′ 41″[1]
Redshift 23370±30 km/s[1]
Distance 1.07 Gly
Type E3[1]
Number of stars 100 trillion (1014)
Apparent dimensions (V) 1'.2 × 0'.6[1]
Apparent magnitude (V) 14.7[1]
Other designations
UGC 9752,[1] PGC 54167,[1] A2029-BCG[1]
See also: Galaxy, List of galaxies

IC 1101 is a supergiant elliptical galaxy at the center of the Abell 2029 galaxy cluster, approximately 1.07 billion light-years (309 megaparsecs) from Earth.


The galaxy is classified as a supergiant elliptical (E) to lenticular (S0)[2] and is the brightest galaxy in A2029 (hence its other designation A2029-BCG; BCG meaning Brightest cluster galaxy).[3][4] 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.

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 19 June 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.

See also[edit]


  1. ^ a b c d e f g h i "NASA/IPAC Extragalactic Database". Results for IC 1101. Retrieved 11 November 2006. 
  2. ^ "Data for IC 1101". SIMBAD Astronomical Database. 
  3. ^ http://arxiv.org/PS_cache/astro-ph/pdf/0209/0209205v2.pdf
  4. ^ 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. 

External links[edit]

Coordinates: Sky map 15h 10m 56.1s, +05° 44′ 41″