HD 156331 is double star in the southern constellation of Ara. As of 2014, the pair have an angular separation of less than an arc second along a position angle of 49°.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| Right ascension | 17h 19m 30.51713s[1] |
| Declination | −50° 03′ 49.5490″[1] |
| Apparent magnitude (V) | 6.27[2] (7.0 + 7.0)[3] |
| Characteristics | |
| Spectral type | F8III + B9V[3] |
| B−V color index | +0.41[2] |
| Astrometry | |
| Radial velocity (Rv) | +10.50±1.2[4] km/s |
| Proper motion (μ) | RA: +8.76[1] mas/yr Dec.: −32.86[1] mas/yr |
| Parallax (π) | 16.94 ± 0.51 mas[1] |
| Distance | 193 ± 6 ly (59 ± 2 pc) |
| Details | |
| HD 156331 A | |
| Mass | 1.56[5] M☉ |
| Luminosity | 8.6[6] L☉ |
| Surface gravity (log g) | 3.46[5] cgs |
| Temperature | 6597[6] K |
| Metallicity [Fe/H] | −0.02[5] dex |
| Age | 1.80[5] Gyr |
| 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 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
- ^ a b c 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
- ^ 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. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
- ^ a b c d Casagrande, L.; et al. (2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy & Astrophysics. 530 (A138): 21. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276. S2CID 56118016.
- ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352
External links
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