HD 158633 is a main sequence star in the northern constellation of Draco. With an apparent visual magnitude of 6.43, this star is a challenge to view with the unaided eye but it can be seen clearly with a small telescope. Based upon parallax measurements, it is located at a distance of around 42 light years from the Sun. The star is drifting closer to the Sun with a radial velocity of −39 km/s,[2] and is predicted to come to within 26.5 ly (8.1 pc) in around 190,400 years.[10]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco |
| Right ascension | 17h 25m 00.09827s[1] |
| Declination | +67° 18′ 24.1501″[1] |
| Apparent magnitude (V) | 6.44[2] |
| Characteristics | |
| Spectral type | K0 V[2] |
| U−B color index | +0.29[3] |
| B−V color index | +0.76[3] |
| Astrometry | |
| Radial velocity (Rv) | −38.71±0.08[2] km/s |
| Proper motion (μ) | RA: −531.958[1] mas/yr Dec.: +4.734[1] mas/yr |
| Parallax (π) | 78.1653 ± 0.51 mas[1] |
| Distance | 41.7 ± 0.3 ly (12.79 ± 0.08 pc) |
| Absolute magnitude (MV) | 5.89[4] |
| Details | |
| Mass | 0.729[5] M☉ |
| Radius | 0.7891±0.0144[5] R☉ |
| Luminosity | 0.4090±0.0040[5] L☉ |
| Surface gravity (log g) | 4.80[6] cgs |
| Temperature | 5,203±46[5] K |
| Metallicity [Fe/H] | −0.43±0.08[7] dex |
| Rotational velocity (v sin i) | 3.4[8] km/s |
| Age | 4.27[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a K-type main sequence star with a spectral classification of K0 V. It has about 79% of the Sun's radius and 73% of the solar mass.[5] It is an estimated 4.3 billion years old and is spinning with a projected rotational velocity of 3.4 km/s.[8] The star is emitting an excess of infrared radiation at a wavelength of 70 μm, suggesting the presence of an orbiting debris disk.[7] It has a low metallicity, with only 37% of the Sun's abundance of elements more massive than helium,[7] and has a relatively high proper motion.[1][9]
References edit
- ^ a b c d e f 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 Hauck, B.; Mermilliod, M. (1998). "uvbyβ photoelectric photometric catalogue". Astronomy and Astrophysics Supplement Series. 129 (3): 431–433. Bibcode:1998A&AS..129..431H. doi:10.1051/aas:1998195.
- ^ Kovtyukh, V. V.; et al. (2004). "A new Böhm-Vitense gap in the temperature range 5560 to 5610 K in the main sequence". Astronomy and Astrophysics. 427 (3): 933–936. arXiv:astro-ph/0409753. Bibcode:2004A&A...427..933K. doi:10.1051/0004-6361:20041449. S2CID 204935981.
- ^ a b c d e Boyajian, Tabetha S.; et al. (July 2013), "Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations", The Astrophysical Journal, 771 (1): 31, arXiv:1306.2974, Bibcode:2013ApJ...771...40B, doi:10.1088/0004-637X/771/1/40, S2CID 14911430, 40. See Table 3.
- ^ Luck, R. Earle; Heiter, Ulrike (2006). "Dwarfs in the Local Region". The Astronomical Journal. 131 (6): 3069–3092. Bibcode:2006AJ....131.3069L. doi:10.1086/504080.
- ^ a b c d Beichman, C. A.; et al. (2006). "New Debris Disks Around Nearby Main-Sequence Stars: Impact on the Direct Detection of Planets". The Astrophysical Journal. 652 (2): 1674–1693. arXiv:astro-ph/0611682. Bibcode:2006ApJ...652.1674B. doi:10.1086/508449. S2CID 14207148.
- ^ a b Luck, R. Earle (January 2017), "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants", The Astronomical Journal, 153 (1): 19, arXiv:1611.02897, Bibcode:2017AJ....153...21L, doi:10.3847/1538-3881/153/1/21, S2CID 119511744, 21.
- ^ a b "LHS 3287". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-04-14.
- ^ Bailer-Jones, C. A. L. (January 2018), "The completeness-corrected rate of stellar encounters with the Sun from the first Gaia data release", Astronomy & Astrophysics, 609: 16, arXiv:1708.08595, Bibcode:2018A&A...609A...8B, doi:10.1051/0004-6361/201731453, S2CID 119462489, A8