Astronomy:R Horologii
From HandWiki
Short description: Variable star in the constellation Horologium
 R Horologii (R) in Horologium | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| Distance | approx. 1,000 ly (approx. 310 pc) |
| Details | |
| Temperature | 2,200[7] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 Privett, Grant; Jones, Kevin (2013). The Constellation Observing Atlas. New York, New York: Springer Science & Business Media. p. 102. ISBN 9781461476481. https://books.google.com/books?id=uN69BAAAQBAJ&pg=PA102.
- ↑ Keenan, Philip C. (June 1966). "A Catalogue of Spectra of Mira Variables of Types ME and Se". Astrophysical Journal Supplement 13: 333. doi:10.1086/190139. Bibcode: 1966ApJS...13..333K.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 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. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S.
- ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ 7.0 7.1 Danilovich, T. et al. (October 2017), "Sulphur-bearing molecules in AGB stars. I. The occurrence of hydrogen sulphide", Astronomy & Astrophysics 606: 14, doi:10.1051/0004-6361/201731203, A124, Bibcode: 2017A&A...606A.124D
- ↑ "R Horologii". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=R+Horologii.
- ↑ "Download Data". AAVSO. https://www.aavso.org/data-download.
- ↑ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–64. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
- ↑ Templeton, M. R.; Mattei, J. A.; Willson, L. A. (2005). "Secular Evolution in Mira Variable Pulsations". The Astronomical Journal 130 (2): 776–788. doi:10.1086/431740. Bibcode: 2005AJ....130..776T.
External links
 |  |
