Summary
HD 167257 (HR 6821) is a solitary star in the southern constellation Telescopium. It has an apparent magnitude of 6.05,[2] making it faintly visible to the naked eye. Parallax measurements place the star at a distance of 420 light years[1] and has a radial velocity of −5.1 km/s,[6] which is poorly constrained. This indicates that it is drifting towards the Solar System.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 18h 17m 00.9195s[1] |
| Declination | –51° 04′ 05.7597″[1] |
| Apparent magnitude (V) | 6.05±0.01[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | B9V[4] |
| B−V color index | −0.06[5] |
| Astrometry | |
| Radial velocity (Rv) | −5.1±4.3[6] km/s |
| Proper motion (μ) | RA: +1.260 mas/yr[1] Dec.: −9.497 mas/yr[1] |
| Parallax (π) | 7.7579 ± 0.0512 mas[1] |
| Distance | 420 ± 3 ly (128.9 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.64[7] |
| Details | |
| Mass | 2.63±0.06[3] M☉ |
| Radius | 2.8±0.1[8] R☉ |
| Luminosity | 64.6+7.7 −8.7[3] L☉ |
| Surface gravity (log g) | 3.97±0.06[8] cgs |
| Temperature | 10,139[9] K |
| Metallicity [Fe/H] | 0.00[10] dex |
| Rotational velocity (v sin i) | 61[11] km/s |
| Age | 239[10] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 167257 has a stellar classification of B9 V,[4] indicating that it is an ordinary B-type main-sequence star. It has 2.63 times the mass of the Sun,[3] and 2.8 times the radius of the Sun.[8] It shines with a luminosity of about 65 L☉[3] from its photosphere at an effective temperature of 10,139 K,[9] giving it a bluish white hue. HD 167257 is estimated to be about 240 million years old[10] – 58.6% through its main sequence lifetime[3] – and spins modestly with a projected rotational velocity of 61 km/s;[11] it has a solar metallicity.[10]
References edit
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
- ^ a b c d e f Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. S2CID 55586789.
- ^ a b Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H.
- ^ Corben, P. M.; Stoy, R. H. (1968). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa. 27: 11. Bibcode:1968MNSSA..27...11C. ISSN 0024-8266.
- ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737. S2CID 119231169.
- ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 255204555.
- ^ a b c Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
- ^ a b Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (23 June 2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497. eISSN 1432-0746. ISSN 0004-6361.
- ^ a b c d Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. ISSN 0320-0108. S2CID 255201789.
- ^ a b Levato, H.; Grosso, M. (June 2004). "New Projected Rotational Velocities of All Southern B-type Stars of the Bright Star Catalogue". Astronomical Society of the Pacific. 215: 51. Bibcode:2004IAUS..215...51L.