Epoch J2000.0  Equinox J2000.0 
|Right ascension||23h 30m 01.9403s |
|Declination||+58° 32′ 56.112″ |
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.
The star was frequently referred to as IH Cas (or IH Cas) in literature. 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. 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.
- SIMBAD, "AR Cas" (accessed 2010-10-27)
- WikiSky, "HD 221253" (accessed 2010-10-27)
- 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 , Bibcode: 2008MNRAS.389..869E , arXiv:0806.2878 , VizieR (accessed 2010-10-27)
- 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 , Bibcode: 1997A&AS..124...75T , VizieR (accessed 2010-10-27)
- 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
- The Observatory, "IH Cas = AR Cas", W.B. Somerville, vol. 106, p. 40-42, April 1986, Bibcode: 1986Obs...106...40S
- Journal of Astronomy, "Studies of visual double stars", D. D. Meisel, no.73, pp.350-360, June 1968, doi:10.1086/110637 , Bibcode: 1968AJ.....73..350M