Astronomy:HD 143787
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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 |
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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Liu, Y. J. et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society 382 (2): 553–66, doi:10.1111/j.1365-2966.2007.11852.x, Bibcode: 2007MNRAS.382..553L.
- ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal 150 (3), doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L
- ↑ "HD 143787". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+143787.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
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