R Horologii

R Horologii

R Horologii (R) in Horologium
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Horologium
Right ascension 02h 53m 52.77465s[1]
Declination −49° 53′ 22.7330″[1]
Apparent magnitude (V) 7.22[2]
Characteristics
Spectral type M5-7e[3]
B−V color index 1.044±0.011[2]
Variable type Mira Ceti[4]
Astrometry
Radial velocity (Rv)+60.0±4.4[5] km/s
Proper motion (μ) RA: +125.698[1] mas/yr
Dec.: +35.975[1] mas/yr
Parallax (π)3.1999 ± 0.3632[1] mas
Distanceapprox. 1,000 ly
(approx. 310 pc)
Details
Temperature2,200[6] K
Other designations
R Hor, CD−50° 860, HD 18242, HIP 13502, HR 868[7]
Database references
SIMBADdata

R Horologii is a red giant star approximately 1,000 light-years away in the southern constellation of Horologium.[8] It is a Mira variable with a period of 404.83 days,[9] ranging from apparent magnitude 4.7 to 14.3—one of the largest ranges in brightness known.[10] The star is losing mass at the rate of 5.9×10−7 M☉·y−1.[6]

References

  1. 1 2 3 4 5 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.
  2. 1 2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  3. ↑ Keenan, Philip C. (June 1966). "A Catalogue of Spectra of Mira Variables of Types ME and Se". Astrophysical Journal Supplement. 13: 333. Bibcode:1966ApJS...13..333K. doi:10.1086/190139.
  4. ↑ Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085.
  5. ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  6. 1 2 Danilovich, T.; et al. (October 2017), "Sulphur-bearing molecules in AGB stars. I. The occurrence of hydrogen sulphide", Astronomy & Astrophysics, 606: 14, Bibcode:2017A&A...606A.124D, doi:10.1051/0004-6361/201731203, A124
  7. ↑ "R Horologii". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 March 2016.
  8. ↑ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–64. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  9. ↑ Templeton, M. R.; Mattei, J. A.; Willson, L. A. (2005). "Secular Evolution in Mira Variable Pulsations". The Astronomical Journal. 130 (2): 776. arXiv:astro-ph/0504527. Bibcode:2005AJ....130..776T. doi:10.1086/431740.
  10. ↑ Privett, Grant; Jones, Kevin (2013). The Constellation Observing Atlas. New York, New York: Springer Science & Business Media. p. 102. ISBN 9781461476481.
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