R Capricorni

R Capricorni (R Cap) is a star in the constellation of Capricornus.[1] It has an apparent visual magnitude which varies between 9.4 and 14.9.[2] A mira variable and ageing red giant, it is in the asymptotic giant branch stage of its lifespan.[3]

R Capricorni
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Capricornus
Right ascension 20h 11m 18.39s[1]
Declination −14° 16′ 04.4″[1]
Apparent magnitude (V) 9.4 to 14.9[2]
Characteristics
Spectral type Cev[1]
Variable type M[2]
Astrometry
Proper motion (μ) RA: 4[1] mas/yr
Dec.: −6[1] mas/yr
Other designations
R Cap, BD−14 5663, GC 28001, SAO 163323.[1]
Database references
SIMBADdata

R Capricorni is too far from earth for its parallax to be measured effectively; Guandalini and Cristallo calculated the luminosity of Mira variables based on their periods. Using a period of 345.13 days, they calculated the absolute magnitude of R Capricorni to be -4.58.[3]

References
  1. V* R Cap -- Variable Star of Mira Cet type, database entry, SIMBAD. Accessed on line November 9, 2009.
  2. R Cap, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 9, 2009.
  3. Guandalini, R.; Cristallo, S. (2013). "Luminosities of carbon-rich asymptotic giant branch stars in the Milky Way". Astronomy & Astrophysics. 555: 7. arXiv:1305.4203. Bibcode:2013A&A...555A.120G. doi:10.1051/0004-6361/201321225. S2CID 54918450. A120.
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