Virgo I is an extremely faint satellite galaxy of the Milky Way. It was discovered in the Subaru Strategic Survey. Virgo I has an absolute visual magnitude of -0.8 making it the least luminous galaxy confirmed thus far. The galaxy has a radius of 124 light years, (half light radius 38 pc) meaning that it is too big to be a globular cluster. Cetus II is dimmer, but too small to be classed as a galaxy. Virgo I is dimmer than Segue I, the previous dimmest known. The distance to Virgo I is 87 kiloparsecs (280,000 ly).
- ^ a b c d e f g h Homma, Daisuke; Chiba, Masashi; Okamoto, Sakurako; Komiyama, Yutaka; Tanaka, Masayuki; Tanaka, Mikito; Ishigaki, Miho N.; Akiyama, Masayuki; Arimoto, Nobuo; Garmilla, José A.; Lupton, Robert H.; Strauss, Michael A.; Furusawa, Hisanori; Miyazaki, Satoshi; Murayama, Hitoshi; Nishizawa, Atsushi J.; Takada, Masahiro; Usuda, Tomonori; Wang, Shiang-Yu (14 November 2016). "A New Milky Way Satellite Discovered In The Subaru/Hyper Suprime-Cam Survey". The Astrophysical Journal. 832 (1): 21. arXiv:1609.04346. Bibcode:2016ApJ...832...21H. doi:10.3847/0004-637X/832/1/21.
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