HD 163145 is a single[5] star in the constellation Scorpius, near the southeast constellation border with Corona Australis. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.85.[2] Based on parallax measurements, it is located at a distance of approximately 307 light years from the Sun. The star is drifting further away with a radial velocity of +35.6 km/s,[1] having come to within 49.2 light-years of the Sun some 1.871 million years ago.[2] It has an absolute magnitude of 0.12.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 17h 56m 47.41221s[1] |
| Declination | −44° 20′ 31.9504″[1] |
| Apparent magnitude (V) | 4.85[2] |
| Characteristics | |
| Spectral type | K2 III[3] |
| B−V color index | 1.176±0.062[2] |
| Astrometry | |
| Radial velocity (Rv) | +35.60±0.45[1] km/s |
| Proper motion (μ) | RA: −0.825±0.370[1] mas/yr Dec.: −27.277±0.317[1] mas/yr |
| Parallax (π) | 10.6395 ± 0.2141 mas[1] |
| Distance | 307 ± 6 ly (94 ± 2 pc) |
| Absolute magnitude (MV) | 0.12[1] |
| Details | |
| Radius | 20.40+0.41 −0.66[1] R☉ |
| Luminosity | 147.0±3.4[1] L☉ |
| Temperature | 4,450+74 −46[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
This object is an aging giant star with a stellar classification of K2 III.[3] With the supply of hydrogen exhausted at its core, the star has cooled and expanded off the main sequence. At present it has 20 times the radius of the Sun. The star is radiating 147 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,450 K.[1]
References
edit- ^ a b c d e f g h i j k l m 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. Gaia DR2 record for this source at VizieR.
- ^ a b c d 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.
- ^ a b Houk, N. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 2. Dept. of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
- ^ "HD 163145". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-03.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.