Astrophysics (Index)About

satellite galaxy

(galaxy that orbits a larger galaxy)

A satellite galaxy is a small galaxy, often a dwarf galaxy, orbiting a larger galaxy. A number of galaxies in the Local Group are satellites of the Milky Way or Andromeda. Some of the 30+ known satellites of the Milky Way:

Among Andromeda's satellites:

The exact number of satellite galaxies of the Milky Way and Andromeda are unclear as they are still being discovered, there is often discussion as to what constitutes a galaxy versus a globular cluster, and knowing whether it is orbiting depends upon its velocity, and such velocity determination is non-trivial and undergoes corrections over time. Satellites in the Local Group are still being discovered and dwarf galaxies are even harder to identify in more distant groups and clusters.

(galaxy type)
Further reading:

Referenced by pages:
core-cusp problem
conditional stellar mass function (CSMF)
dark matter halo
dwarf galaxy
dwarf galaxy problem
dynamical friction
galactic halo
galaxy group
galaxy subgroup
Hydrogen Accretion in Local Galaxies Survey (HALOGAS)
Large Magellanic Cloud (LMC)
Local Group (LG)
Andromeda (M31)
Magellanic clouds (MC)
Milky Way subgroup
Sagittarius Dwarf Elliptical Galaxy (Sgr dE)
satellite plane problem
stellar stream