Andromeda II

Andromeda II
Andromeda II, as taken by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationPisces
Right ascension01h 16m 29.8s[1]
Declination+33° 25′ 09″[1]
Redshift−188 ± 3 km/s[1]
Distance2.22 ± 0.07 Mly (680 ± 20 kpc)[2][3]
Apparent magnitude (V)13.5[1]
Characteristics
TypedSph[1]
Apparent size (V)3.6 × 2.52[1]
Notable featuressatellite galaxy of M31
Other designations
Andromeda II Dwarf Spheroidal,[1]
PGC 4601,[1][4] And II[5]

Andromeda II (And II) is a dwarf spheroidal galaxy about 2.22 Mly away in the constellation Pisces. While part of the Local Group, it is not quite clear if it is a satellite of the Andromeda Galaxy or the Triangulum Galaxy.[citation needed]

It was discovered by Sidney Van den Bergh[6] in a survey of photographic plates taken with the Palomar 48-inch (1.2 m) Schmidt telescope in 1970 and 1971, together with Andromeda I, Andromeda III, and the presumable non- or background galaxy Andromeda IV.[7]

  1. ^ a b c d e f g h "NASA/IPAC Extragalactic Database". Results for Andromeda II. Retrieved 2006-11-29.
  2. ^ I. D. Karachentsev; V. E. Karachentseva; W. K. Hutchmeier; D. I. Makarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal. 127 (4): 2031–2068. Bibcode:2004AJ....127.2031K. doi:10.1086/382905.
  3. ^ Karachentsev, I. D.; Kashibadze, O. G. (2006). "Masses of the local group and of the M81 group estimated from distortions in the local velocity field". Astrophysics. 49 (1): 3–18. Bibcode:2006Ap.....49....3K. doi:10.1007/s10511-006-0002-6. S2CID 120973010.
  4. ^ "NAME Andromeda II". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2006-11-29.
  5. ^ Cite error: The named reference Bergh2000 was invoked but never defined (see the help page).
  6. ^ McConnachie, A. W.; Irwin, M. J.; Ferguson, A. M. N.; Ibata, R. A.; Lewis, G. F.; Tanvir, N. (2005). "Distances and metallicities for 17 Local Group galaxies". Monthly Notices of the Royal Astronomical Society. 356 (4): 979–997. arXiv:astro-ph/0410489. Bibcode:2005MNRAS.356..979M. doi:10.1111/j.1365-2966.2004.08514.x.
  7. ^ Van den Bergh, Sydney (January 1972). "Search for Faint Companions to M31". Astrophysical Journal. 171: L31. Bibcode:1972ApJ...171L..31V. doi:10.1086/180861.