R Equulei

R Equulei is a class M Mira variable star in the constellation Equuleus. Its brightness varies between a minimum magnitude of 15.0 to a maximum of 8.7 with an average period of 261 days.[2]

R Equulei
Observation data
Epoch J2000      Equinox J2000
Constellation Equuleus
Right ascension 21h 13m 11.49118s[1]
Declination 12° 48′ 06.1620″[1]
Apparent magnitude (V) 8.7 - 15.0[2]
Characteristics
Spectral type M3e - M4e[2]
B−V color index +1.41[3]
Variable type Mira[2]
Astrometry
Radial velocity (Rv)−54±5[4] km/s
Proper motion (μ) RA: −2.713[1] mas/yr
Dec.: −11.232[1] mas/yr
Parallax (π)0.4329 ± 0.0437[1] mas
Distanceapprox. 7,500 ly
(approx. 2,300 pc)
Details
Mass3.42[5] M☉
Luminosity33,791[6] L☉
Surface gravity (log g)−0.007[5] cgs
Temperature3,395[5] K
Metallicity [Fe/H]−0.13[5] dex
Other designations
R Equ, BD+12°4573a, HD 202051, PPM 139768[7]
Database references
SIMBADdata

References
  1. Brown, A. G. A.; et al. (Gaia collaboration). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics (in press). arXiv:2012.01533. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
  2. Samus, N. N.; Durlevich, O. V.; et al. (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: B/gcvs, Bibcode:2009yCat....102025S.
  3. Zacharias, N.; et al. (2012), "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)", VizieR On-line Data Catalog, 1322, arXiv:1212.6182, Bibcode:2012yCat.1322....0Z.
  4. Wilson, Ralph Elmer (1953), "General catalogue of stellar radial velocities", Washington, Carnegie Institution of Washington: 0, Bibcode:1953GCRV..C......0W.
  5. Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; De Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (2019), "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18", Astronomy and Astrophysics, 628: A94, arXiv:1904.11302, Bibcode:2019A&A...628A..94A, doi:10.1051/0004-6361/201935765.
  6. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  7. "V* R Equ". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-09-17.


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