IC 1101

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IC 1101
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]
See also: Galaxy, List of galaxies

IC 1101 is a supergiant elliptical galaxy at the center of the Abell 2029 galaxy cluster. It is 1.07 billion light years away in the constellation of Virgo and is classified as a cD class of galaxy. It was discovered on June 19, 1790 by William Herschel.


The galaxy's diffuse stellar halo light extends to at least 1.4 million light years, which makes it one of the largest known galaxies in terms of breadth.[2] It is the central galaxy of a massive cluster containing a mass (mostly dark matter) of roughly 100 trillion stars.[3][4]

IC 1101 in X-ray (left) and the Abell 2029 galaxy cluster in visible light (right).

See also[edit]


  1. ^ a b c d e f g h "NASA/IPAC Extragalactic Database". Results for IC 1101. Retrieved 2006-11-11. 
  2. ^ Clarke, Blanton, & Sarazin, Complex Cooling Core of A2029
  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″