Segue 3
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Segue 3 is a faint star cluster of the Milky Way galaxy discovered in 2010 in the data obtained by Sloan Digital Sky Survey.[1] It is located in the Pegasus constellation at the distance of about 17 kpc from the Sun and moves away from it with the velocity of 167.1 ± 1.5 km/s.[2]
Segue 3 is extremely faint—its visible absolute magnitude is estimated at −1.2[1] or even at about 0.0 ± 0.8,[2] which means that the cluster is only 100 to 250 times brighter than the Sun. Its small radius—of about 2.1 pc—is typical for the galactic globular clusters.[2] The cluster has a slightly flattened shape and shows some evidence of the tidal disruption.[2]
The metallicity of Segue's 3 stars is [Fe/H] ≈ −1.7, which means that they contain 70 times less heavy elements than the Sun. These stars are more than 12 billion year old.[2] Segue 3 appears to be one of the faintest globular clusters of the Milky Way.
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Milky Way → Milky Way subgroup → Local Group → Virgo Supercluster → Laniakea Supercluster → Observable universe → Universe
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