Segue 3

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.

[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.