Astronomy:Virgo I

Virgo I
Observation data (J2000 epoch)
Constellation	Virgo
Right ascension	12h 00m 09.6s
Declination	−00° 40′ 48″
Distance	280+42; −26 kly; (87 +13−8 kpc)
Absolute magnitude (V)	−0.8 ± 0.9
Characteristics
Type	dSph
Half-light radius (physical)	38+12; −11 pc
Half-light radius (apparent)	1.5′
Other designations
	Virgo I

Short description: Extremely faint satellite galaxy of the Milky Way

Virgo I is an extremely faint satellite galaxy of the Milky Way.^[2] It was discovered in the Subaru Strategic Survey. Virgo I has an absolute visual magnitude of -0.8 making it one of the least luminous galaxies 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.^[2] Cetus II is dimmer, but too small to be classed as a galaxy.^[2] Virgo I is dimmer than Segue I, the previous dimmest known. The distance to Virgo I is 87 kiloparsecs (280,000 ly).^[1]

References

↑ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 ^1.6 ^1.7 Homma, Daisuke; Chiba, Masashi; Okamoto, Sakurako; Komiyama, Yutaka; Tanaka, Masayuki; Tanaka, Mikito; Ishigaki, Miho N.; Akiyama, Masayuki et al. (14 November 2016). "A New Milky Way Satellite Discovered In The Subaru/Hyper Suprime-Cam Survey". The Astrophysical Journal 832 (1): 21. doi:10.3847/0004-637X/832/1/21. Bibcode: 2016ApJ...832...21H.
↑ ^2.0 ^2.1 ^2.2 "Record-breaking faint satellite galaxy of the Milky Way discovered". 22 November 2016. http://phys.org/news/2016-11-record-breaking-faint-satellite-galaxy-milky.html.