Andromeda XXII
Dwarf galaxy
From Wikipedia, the free encyclopedia
Andromeda XXII (Pisces VI, Triangulum I) is a low surface brightness dwarf spheroidal galaxy about 940–1,033 kiloparsecs (3.07×106–3.37×106 ly) away from the Sun in the constellation Pisces, of the Local Group.
| Andromeda XXII | |
|---|---|
| Observation data (J2000 epoch) | |
| Constellation | Pisces |
| Right ascension | 01h 27m 40s[1][2] |
| Declination | +28° 05′ 25″[1][2] |
| Distance | 940–1,033 kiloparsecs (3.07×106–3.37×106 ly)[3] |
| Apparent magnitude (V) | 18.0[2] |
| Characteristics | |
| Type | dSph |
| Notable features | Satellite galaxy of Triangulum |
| Other designations | |
| Andromeda XXII, And XXII, And 22, Pisces VI, Psc VI, Triangulum I, Tri I [3] | |
Andromeda XXII is located much closer in projection to M33 than M31 [42 kiloparsecs (140×103 ly) vs. 224 kiloparsecs (730×103 ly)]. This fact suggests that it might be the first Triangulum (M33) satellite ever discovered. However, it is currently catalogued as a satellite of Andromeda (M31).[3]
The discovery arose from the first year data of a photometric survey of the M31/M33 subgrouping of the Local Group by the Pan-Andromeda Archaeological Survey (PAndAS). This survey was conducted with the Megaprime/MegaCam wide-field camera mounted on the Canada-France-Hawaii Telescope.