Segue 1

Segue 1 is a dwarf spheroidal galaxy or globular cluster situated in the Leo constellation and discovered in 2006 by Sloan Digital Sky Survey.

[2][5] Segue 1 has a noticeably elongated (ratio of axes ~ 2:1) shape with the half-light radius of about 30 pc.

[6] The name is due to the fact that it was found by the SEGUE program, the Sloan Extension for Galactic Understanding and Exploration.

It is difficult, however, to estimate the mass of such faint objects due to significant foreground contamination, which inflates the velocity dispersion.

[6] The stellar population of Segue 1 consists mainly of old stars formed more than 12 billion years ago.