| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16 03 20.62179 |
| Declination | −25° 51′ 54.8653″ |
| Apparent magnitude (V) | 4.973 |
| Characteristics | |
| Spectral type | K3 III |
| B−V color index | 1.245 |
| Astrometry | |
| Radial velocity (Rv) | −37.88±0.15 km/s |
| Proper motion (μ) | RA: −66.608 mas/yr Dec.: −38.657 mas/yr |
| Parallax (π) | 14.3632 ± 0.2020 mas |
| Distance | 227 ± 3 ly (69.6 ± 1.0 pc) |
| Absolute magnitude (MV) | 0.909 |
| Details | |
| Mass | 1.25 M☉ |
| Luminosity | 61.7 L☉ |
| Surface gravity (log g) | 2.29 cgs |
| Temperature | 4,370±22 K |
| Metallicity | +0.01 dex |
| Age | 4.46 Gyr |
| Other designations | |
| CD−25° 11295, HD 143787, HIP 78650, HR 5969, SAO 184068 | |
| Database references | |
| SIMBAD | data |
HD 143787 is a single star in the southern constellation of Scorpius. It is a fifth magnitude star – apparent visual magnitude of 4.973, and hence is visible to the unaided eye. The distance to HD 143787 can be estimated from its annual parallax shift of 14.4 mas, yielding a separation of 227 light years. It is moving closer to Earth with a heliocentric radial velocity of −37.9 km/s, and should come within 106.4 ly in 1.2 million years.
This is an evolved giant star with a stellar classification of K3 III. It is a red clump giant, which means it is on the horizontal branch and is generating energy through helium fusion at its core. At the age of 4.46 billion years, it has 1.25 times the mass of the Sun and is radiating 61.7 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,370 K.
References
- ^ 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.
- ^ Liu, Y. J.; et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society, 382 (2): 553–66, Bibcode:2007MNRAS.382..553L, doi:10.1111/j.1365-2966.2007.11852.x.
- ^ Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114
- "HD 143787". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-03.
- Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- 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.
