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. It is the central galaxy of a massive cluster containing a mass (mostly dark matter) of roughly 100 trillion stars.