R Horologii is a red giant star approximately 1,000 light-years away in the southern constellation of Horologium.[10] It is a Mira variable with a period of 404.83 days,[11] ranging from apparent magnitude 4.7 to 14.3—one of the largest ranges in brightness known of stars in the night sky visible to the unaided eye.[2] The star is losing mass at the rate of 5.9×10−7 M☉·y−1.[7]
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) | 4.7 - 14.3[2] |
Characteristics | |
Spectral type | M5-7e[3] |
B−V color index | 1.044±0.011[4] |
Variable type | Mira[5] |
Astrometry | |
Radial velocity (Rv) | +60.0±4.4[6] km/s |
Proper motion (μ) | RA: +125.698[1] mas/yr Dec.: +35.975[1] mas/yr |
Parallax (π) | 3.1999 ± 0.3632 mas[1] |
Distance | approx. 1,000 ly (approx. 310 pc) |
Details | |
Temperature | 2,200[7] K |
Other designations | |
Database references | |
SIMBAD | data |
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/75/RHorLightCurve.png/220px-RHorLightCurve.png)
References
edit- ^ a b c d e 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.
- ^ a b Privett, Grant; Jones, Kevin (2013). The Constellation Observing Atlas. New York, New York: Springer Science & Business Media. p. 102. ISBN 9781461476481.
- ^ 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.
- ^ 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, S2CID 119257644.
- ^ 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. S2CID 125853869.
- ^ 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, S2CID 119231169.
- ^ a b Danilovich, T.; et al. (October 2017), "Sulphur-bearing molecules in AGB stars. I. The occurrence of hydrogen sulphide", Astronomy & Astrophysics, 606: 14, arXiv:1707.06003, Bibcode:2017A&A...606A.124D, doi:10.1051/0004-6361/201731203, S2CID 55533463, A124
- ^ "R Horologii". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 March 2016.
- ^ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
- ^ 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. S2CID 18759600.
- ^ Templeton, M. R.; Mattei, J. A.; Willson, L. A. (2005). "Secular Evolution in Mira Variable Pulsations". The Astronomical Journal. 130 (2): 776–788. arXiv:astro-ph/0504527. Bibcode:2005AJ....130..776T. doi:10.1086/431740. S2CID 359940.
External links
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