HD 157819
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| Right ascension | 17h 28m 38.91416s[1] |
| Declination | –55° 10′ 10.8720″[1] |
| Apparent magnitude (V) | 5.94[2] |
| Characteristics | |
| Spectral type | G8 II-III[3] |
| B−V color index | +1.11[2] |
| Astrometry | |
| Radial velocity (Rv) | –12.6 ± 0.4[4] km/s |
| Proper motion (μ) | RA: +2.52[1] mas/yr Dec.: -8.92[1] mas/yr |
| Parallax (π) | 3.31 ± 0.41[1] mas |
| Distance | approx. 1,000 ly (approx. 300 pc) |
| Absolute magnitude (MV) | –2.9[5] |
| Other designations | |
HD 157819 is the Henry Draper Catalogue designation for a star in the southern constellation of Ara. It is faintly visible to the naked eye at an apparent visual magnitude of 5.94[2] and is approximately 1,000 light-years (310 parsecs) distant from the Earth.[1] The spectrum of this star fits a stellar classification of G8 II-III,[3] indicating it is a G-type star that is somewhere between the giant and bright giant stages of its evolution.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
- ↑ 2.0 2.1 2.2 Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa 27: 11, Bibcode:1968MNSSA..27...11C.
- ↑ 3.0 3.1 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
- ↑ Eggen, O. J. (August 1983), "The reddening, metal abundance, and luminosity of high-luminosity G-type stars", Astronomical Journal 88: 1187–1198, Bibcode:1983AJ.....88.1187E, doi:10.1086/113409.
- ↑ "HR 6487 -- Star in double system", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-08-04.
External links
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