UGC 9128 is a
dwarf irregular galaxy
A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek ' (), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. ...
around 6.8–7.8
Mly (2.1–2.4
Mpc MPC, Mpc or mpc may refer to:
Astronomy
* Megaparsec (Mpc), unit of length used in astronomy
* Minor Planet Center, Smithsonian Astrophysical Observatory
** ''Minor Planet Circulars'' (MPC, M.P.C. or MPCs), astronomical publication from the Minor ...
) away; it is thought to be in the
Local Group, although its membership is not certain.
The galaxy has a mass of about , around 100 million
stars, and a diameter of around 3300
ly.
It is therefore quite faint, and so was only discovered in the 20th century.
UGC 9128 is around 2.7
Mly from
GR 8, which is its nearest neighbour.
UGC 9128 is a
starburst galaxy, with the peak of star formation being 20–100 million years ago.
It is thought to have both a
halo and
disc.
References
Dwarf irregular galaxies
Boötes
09128
50961
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