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HD 167257 - Wikipedia

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HD 167257
Observation data Epoch J2000 Equinox J2000
Constellation	Telescopium
Right ascension	18^h 17^m 00.9195^s^[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 (R_v)	−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 (M_V)	+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
7 G. Telescopii, CD–51°11460, CPD−51°10795, GC 24909, HD 167257, HIP 89597, HR 6821, SAO 245372
Database references
SIMBAD	data

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.

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

^ ^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.

Constellation of Telescopium

Stars

Bayer	α δ¹ δ² ε ζ η ι κ λ μ ν ξ ρ τ
Variable	RR RS RX BL HO PV PW PZ QQ QS QU QV
HR	6778 6821 6894 6954 6986 7065 7092 7093 7095 7097 7190 7223 7233 7271 7289 7297 7370 7388 7411 7459 7521 7537 7548 7549 7621 7674 7714 7745 7749 7758 7766
HD	168871 173047 177365 181295 191760
Other	KELT-10 Gliese 754 Gliese 784 GJ 1252

Exoplanets	Gliese 754 b Gliese 784 b GJ 1252 b KELT-10b

Star clusters	NGC 6584

Galaxies

NGC	6845 6861
Other	PKS 2014-55