Andromeda XXII

Andromeda XXII
Andromeda XXII
Observation data (J2000 epoch)
Constellation	Pisces
Right ascension	01h 27m 40s
Declination	+28° 05′ 25″
Distance	940–1,033 kiloparsecs (3.07×106–3.37×106 ly)
Apparent magnitude (V)	18.0
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

Andromeda XXII (Pisces VI, Triangulum I) is a low surface brightness dwarf spheroidal galaxy about 940–1,033 kiloparsecs (3.07×10^⁶–3.37×10^⁶ ly) away from the Sun in the constellation Pisces, of the Local Group.

Andromeda XXII is located much closer in projection to M33 than M31 [42 kiloparsecs (140×10^³ ly) vs. 224 kiloparsecs (730×10^³ 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).

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.

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