R Cassiopeiae

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R Cassiopeiae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 23h 58m 24.873s[1]
Declination +51° 23′ 19.70″[1]
Apparent magnitude (V) +9.97
Spectral type M7IIIe
U−B color index +0.08
B−V color index +1.83
Variable type Mira
Radial velocity (Rv) +021 km/s
Proper motion (μ) RA: 85.52 ± 0.75[1] mas/yr
Dec.: 17.49 ± 0.72[1] mas/yr
Parallax (π) 7.95 ± 1.02[1] mas
Distance approx. 410 ly
(approx. 130 pc)
Absolute magnitude (MV) +4.83
Other designations
HR 9066, HD 224490, BD+50°4202, HIP 118188, SAO 35938, ADS 17135, CCDM J23584+5123

R Cassiopeiae (R Cas) is a star in the constellation Cassiopeia.

R Cassiopeiae is a M-type red giant with a mean apparent magnitude of +9.97. It is classified as a Mira-type variable star and its brightness varies from magnitude +4.7 to +13.5 with a period of 430.5 days. It is approximately 410 light years from Earth.[1]


  1. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry