AR Cassiopeiae

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AR Cassiopeiae
Observation data
Epoch J2000.0 [1]      Equinox J2000.0 [1]
Constellation Cassiopeia [2]
Right ascension 23h 30m 01.9403s [1]
Declination +58° 32′ 56.112″ [1]
Other designations

AR Cassiopeiae (AR Cas) is a multiple star system in the constellation of Cassiopeia. It is thought to be a septuple star system. It is one of only two known star systems with a multiplicity of 7, the other being Nu Scorpii, with no physical multiple stars of greater multiplicity yet found.[3][4][5]

The star was frequently referred to as IH Cas (or IH Cas) in literature.[6] The origin of the designation "IH Cassiopeiae" is from the 17th century catalogue and constellation map by Johannes Hevelius, which was kept in use due to the lack of a Flamsteed designation or Bayer designation for the star.[6] It was the first star in Cassiopeia that Hevelius catalogued, thus "1 Hev. Cas" or "1 H. Cas" (similar to Gould designations), which becomes IH Cas through corruption.[6]

The primary star of the system is Type-B and Class-IV[1] and sub component of the system is an Algol-type eclipsing binary.[1] The system is also considered a visual double star.[7]


  1. ^ a b c d e SIMBAD, "AR Cas" (accessed 2010-10-27)
  2. ^ WikiSky, "HD 221253" (accessed 2010-10-27)
  3. ^ Monthly Notices of the Royal Astronomical Society, "A catalogue of multiplicity among bright stellar systems", Eggleton, P. P.; Tokovinin, A. A., Volume 389, Issue 2, pp. 869-879, September 2008, doi:10.1111/j.1365-2966.2008.13596.x , Bibcode2008MNRAS.389..869E , arXiv:0806.2878 , VizieR (accessed 2010-10-27)
  4. ^ Astronomy & Astrophysics Supplement Series, "MSC - a catalogue of physical multiple stars", Tokovinin, A. A., Vol. 124, July 1997, pp.75-84, July 1997, doi:10.1051/aas:1997181 , Bibcode1997A&AS..124...75T , VizieR (accessed 2010-10-27)
  5. ^ Springer-Verlag "Observing and Measuring Visual Double Stars" (Patick Moore's Practical Astronomy Series), Bob Argyle, ed., 2004, ISBN 1-85233-558-0 , pg.9
  6. ^ a b c The Observatory, "IH Cas = AR Cas", W.B. Somerville, vol. 106, p. 40-42, April 1986, Bibcode1986Obs...106...40S
  7. ^ Journal of Astronomy, "Studies of visual double stars", D. D. Meisel, no.73, pp.350-360, June 1968, doi:10.1086/110637 , Bibcode1968AJ.....73..350M