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Virgo I
Observation data (J2000 epoch)
Constellation	Virgo
Right ascension	12^h 00^m 09.6^s^[1]
Declination	−00° 40′ 48″^[1]
Distance	280+42 −26 kly (87 ⁺¹³ ₋₈ kpc)^[1]
Absolute magnitude (V)	−0.8 ± 0.9^[1]
Characteristics
Type	dSph^[1]
Half-light radius (physical)	38+12 −11 pc^[1]
Half-light radius (apparent)	1.5′^[1]
Other designations
Virgo I

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

^ ^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. S2CID 118700037.
^ ^a ^b ^c "Record-breaking faint satellite galaxy of the Milky Way discovered". PhysOrg. 22 November 2016. Retrieved 24 November 2016.

Milky Way

Location

Milky Way → Milky Way subgroup → Local Group → Local Sheet → Virgo Supercluster → Laniakea Supercluster → Local Hole → Observable universe → Universe
Each arrow (→) may be read as "within" or "part of".

Structure

Galactic Center	Sagittarius A Sagittarius A* Fermi bubbles Supermassive black hole Galactic Center filaments Galactic Center GeV excess
Disk	Carina–Sagittarius Norma–Cygnus Orion–Cygnus Perseus Scutum–Centaurus Near 3 kpc Arm Far 3 kpc Arm
Halo	Aquarius Stream Fimbulthul stream Gaia Sausage Helmi stream Magellanic Stream Monoceros Ring Palomar 5 stream Pisces-Eridanus stream Sagittarius Stream Virgo Stream

Satellite
galaxies

Magellanic Clouds

Dwarfs

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