UGC 9128 is a dwarf irregular galaxy around 6.8–7.8 Mly (2.1–2.4 Mpc) away; it is thought to be in the Local Group, although its membership is not certain.

[2][3] The galaxy has a mass of about (1.3±0.2)×107 M☉, around 100 million stars, and a diameter of around 3300 ly.

[2] UGC 9128 is around 2.7 Mly from GR 8, which is its nearest neighbour.

[6] UGC 9128 is a starburst galaxy, with the peak of star formation being 20–100 million years ago.

[3][6] It is thought to have both a halo and disc.