HD 143787 is a single[5] star in the southern constellation of Scorpius. It is a fifth magnitude star – apparent visual magnitude of 4.973,[2] 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,[1] yielding a separation of 227 light years. It is moving closer to Earth with a heliocentric radial velocity of −37.9 km/s,[1] and should come within 106.4 ly in 1.2 million years.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 03m 20.62179s[1] |
| Declination | −25° 51′ 54.8653″[1] |
| Apparent magnitude (V) | 4.973[2] |
| Characteristics | |
| Spectral type | K3 III[3] |
| B−V color index | 1.245[3] |
| Astrometry | |
| Radial velocity (Rv) | −37.88±0.15[1] km/s |
| Proper motion (μ) | RA: −66.608[1] mas/yr Dec.: −38.657[1] mas/yr |
| Parallax (π) | 14.3632 ± 0.2020 mas[1] |
| Distance | 227 ± 3 ly (69.6 ± 1.0 pc) |
| Absolute magnitude (MV) | 0.909[2] |
| Details | |
| Mass | 1.25[3] M☉ |
| Luminosity | 61.7[3] L☉ |
| Surface gravity (log g) | 2.29[2] cgs |
| Temperature | 4,370±22[3] K |
| Metallicity [Fe/H] | +0.01[2] dex |
| Age | 4.46[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an evolved giant star with a stellar classification of K3 III.[3] It is a red clump giant, which means it is on the horizontal branch and is generating energy through helium fusion at its core.[2] At the age of 4.46[3] billion years, it has 1.25[3] times the mass of the Sun and is radiating 61.7[3] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,370 K.[3]
References
edit- ^ a b c d e f g h 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.
- ^ a b c d e f 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.
- ^ a b c d e f g h i j k 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.