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) 4.70 - 13.50[2]
Spectral type M6e - M10e[2]
U−B color index +0.08
B−V color index +1.83
Variable type Mira[2]
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
Distanceapprox. 410 ly
(approx. 130 pc)
Mass0.59[3] M
Radius263[3]–310[4] R
Diameter263[3]–310[4] D
Luminosity3,837[3] L
Temperature2,812[3] K
Other designations
HR 9066, HD 224490, BD+50°4202, HIP 118188, SAO 35938, ADS 17135, CCDM J23584+5123
Database references

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

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

R Cassiopeiae was once a candidate for the largest known star with a diameter of 1,800 D.[citation needed]

See also[edit]


  1. 1.0 1.1 1.2 1.3 1.4 1.5 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. http://www.aanda.org/articles/aa/full/2007/41/aa8357-07/aa8357-07.html.Vizier catalog entry
  2. 2.0 2.1 2.2 Samus, N. N.Expression error: Unrecognized word "etal". (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S 1. Bibcode 2009yCat....102025S.
  3. 3.0 3.1 3.2 3.3 Takeuti, Mine; Nakagawa, Akiharu; Kurayama, Tomoharu; Honma, Mareki (2013). "A Method to Estimate the Masses of Asymptotic Giant Branch Variable Stars". Publications of the Astronomical Society of Japan 65 (3): 60. Bibcode 2013PASJ...65...60T. doi:10.1093/pasj/65.3.60.
  4. De Beck, E.; Decin, L.; De Koter, A.; Justtanont, K.; Verhoelst, T.; Kemper, F.; Menten, K. M. (2010). "Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles. II. CO line survey of evolved stars: Derivation of mass-loss rate formulae". Astronomy and Astrophysics 523: A18. arXiv:1008.1083. Bibcode 2010A&A...523A..18D. doi:10.1051/0004-6361/200913771.

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