HD 157662 is a bright giant star in the southern constellation of Ara. It has a magnitude 10.91 companion at an angular separation of 76.4″ along a position angle of 159°.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| Right ascension | 17h 27m 12.46093s[1] |
| Declination | −50° 37′ 49.3379″[1] |
| Apparent magnitude (V) | 5.905[2] |
| Characteristics | |
| Spectral type | B9II[3] |
| U−B color index | +0.055[4] |
| B−V color index | +0.105[4] |
| Astrometry | |
| Radial velocity (Rv) | +11.0[5] km/s |
| Proper motion (μ) | RA: +0.19[1] mas/yr Dec.: −2.53[1] mas/yr |
| Parallax (π) | 1.10 ± 0.38 mas[1] |
| Distance | approx. 3,000 ly (approx. 900 pc) |
| Details | |
| Mass | 7.87±1.68[2] M☉ |
| Luminosity | 8,214[2] L☉ |
| Temperature | 10,650[2] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
edit- ^ a b c d e van Leeuwen, F. (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. S2CID 18759600.
- ^ a b c d Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355, S2CID 111387483
- ^ Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H
- ^ a b Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
- ^ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W
- ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22
External links
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