Andromeda XXII

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Andromeda XXII
Observation data
Constellation Pisces
Right ascension 1h 27m 40s [1][2]
Declination +28° 05′ 25″ [1][2]
Distance 940–1,033 kiloparsecs (3.07×10^6–3.37×10^6 ly) [3]
Apparent magnitude (V) 6.5 ± 0.8
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]
See also: Galaxy, List of galaxies

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).[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.

See also[edit]


  1. ^ a b Deep Sky Observer's Companion, Andromeda XXII (accessed 2 April 2011)
  2. ^ a b SIMBAD, ANDROMEDA XXII (accessed 2011 April 2)
  3. ^ a b c Nicolas F. Martin, Alan W. McConnachie, Mike Irwin, Lawrence M. Widrow, Annette M. N. Ferguson, Rodrigo A. Ibata, John Dubinski, Arif Babul, Scott Chapman, Mark Fardal, Geraint F. Lewis, Julio Navarro, R. Michael Rich; "PAndAS' cubs: discovery of two new dwarf galaxies in the surroundings of the Andromeda and Triangulum galaxies"; The Astrophysical Journal, Volume 705, Issue 1, pp. 758-765 (2009); doi:10.1088/0004-637X/705/1/758; Bibcode2009ApJ...705..758M; arXiv:0909.0399;