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HD 173791 - Wikipedia

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HD 173791
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Telescopium
Right ascension	18^h 49^m 27.3433^s^[1]
Declination	–45° 48′ 36.3601″^[1]
Apparent magnitude (V)	5.80 ± 0.01^[2]
Characteristics
Evolutionary stage	Horizontal branch^[3]
Spectral type	G8 III^[4]
B−V color index	+0.9^[5]
Astrometry

Radial velocity (R_v)	9.7 ± 2.9^[6] km/s
Proper motion (μ)	RA: +74.263^[1] mas/yr Dec.: +57.015^[1] mas/yr
Parallax (π)	8.9671 ± 0.0429 mas^[1]
Distance	364 ± 2 ly (111.5 ± 0.5 pc)
Absolute magnitude (M_V)	+0.6^[7]

Details

Mass	1.31^[8] `M`_☉
Radius	10.3^[9] `R`_☉
Luminosity	63.6±0.9^[10] `L`_☉
Surface gravity (log g)	2.46^[8] cgs
Temperature	5,093±123^[9] K
Metallicity [Fe/H]	−0.43 ± 0.16^[3] dex
Rotational velocity (v sin i)	2.7±1.5^[11] km/s

Other designations
30 G. Telescopii [12], CPD−45 9479, FK5 3495, HD 173791, HIP 92367, SAO 229306^[13]
Database references
SIMBAD	data

HD 173791 (HR 7065) is a solitary^[14] yellow hued star located in the southern constellation Telescopium. It has an apparent magnitude of 5.80,^[2] allowing it to be viewed with the naked eye under suitable viewing conditions. Parallax measurements place the object at a distance of 364 light years ,^[1] and it is currently receding from the Solar System with a heliocentric radial velocity of 9.7 km/s.^[6]

This is a red giant with a stellar classification of G8 III.^[4] It is currently on the cool end of the horizontal branch, fusing helium at its core.^[3] At present it has 1.31 times the mass of the Sun^[8] but has expanded to 10.3 times its girth.^[9] It radiates at 63.6 L_☉^[10] from its enlarged photosphere at an effective temperature of 5,093 K.^[9] HD 173791 is metal deficient–with a metallicity only 37% that of the Sun;^[3] it spins modestly with a projected rotational velocity of 2.7 km/s.^[3]

References

^ ^a ^b ^c ^d ^e ^f 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 Jones, M. I.; Jenkins, J. S.; Rojo, P.; Melo, C. H. F. (December 2011). "Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets: I. Sample definition and physical properties⋆⋆⋆". Astronomy & Astrophysics. 536: A71. arXiv:1110.6459. Bibcode:2011A&A...536A..71J. doi:10.1051/0004-6361/201117887. ISSN 0004-6361.
^ ^a ^b Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H.
^ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1 January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
^ ^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. eISSN 1562-6873. 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 255204555.
^ ^a ^b ^c Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361.
^ ^a ^b ^c ^d 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 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.
^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. eISSN 1432-0746. ISSN 0004-6361.
^ Gould, B. A., Uranometria Argentina, Reprinted and updated by Pilcher, F, archived from the original on 2012-02-27, retrieved 2012-01-06
^ "HR 7065 -- Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2011-12-19
^ 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

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