Trisha Shetty (Editor)

IC 1101

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Right ascension
15 10 56.1

Apparent mass
~2,500,000 billion M☉

+05° 44′ 41″


Apparent magnitude (V)

IC 1101 The Largest Galaxy In the Known Universe IC 1101


Helio radial velocity
23,368 ± 26 km/s (14,520 ± 16 mi/s)

Galactocentric velocity
23,395 ± 26 km/s (14,537 ± 16 mi/s)

1.045 ± 0.073 billion ly (320.4 ± 22.4 Mpc)h−10.73

Abell 2029, IC 1011, VY Canis Majoris, UY Scuti, TrES‑4b

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IC 1101 is a supergiant elliptical galaxy at the center of the Abell 2029 galaxy cluster, approximately 320 megaparsecs (1.04 billion light-years) from Earth.


IC 1101 IC 1101

The largest galaxy in the universe ic 1101


IC 1101 Munchkin Milky Way meets megamonster galaxy IC 1101 Astro Bob

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 it possibly being shaped like a flat disc but only visible from Earth at its broadest dimensions. However, most lenticulars have sizes ranging from 15 to 37 kpc (50 to 120 thousand ly).

IC 1101 httpsuploadwikimediaorgwikipediacommonsthu

IC 1101 is among the largest known galaxies, but there is debate in the astronomical literature about how to define the size of such a galaxy. Photographic plates of blue light from the galaxy (sampling stars excluding the diffuse halo) yield an effective radius (the radius within which half the light is emitted) of 65 ± 12 kpc (212 ± 39 thousand ly). The galaxy has a very large halo of much lower intensity "diffuse light" extending to a radius of 600 kpc (2 million ly). The authors of the study identifying the halo conclude that IC 1101 is "possibly one of the largest and most luminous galaxies in the universe."

IC 1101 The Largest Galaxy in the Known Universe IC 1101 YouTube

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 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.


IC 1101 Wikipedia