HD 166114

HD 166114, also known as HR 6786 or rarely 2 G. Coronae Australis, is a solitary,[14] yellowish-white hued star located in the southern constellation Corona Australis. It has an apparent magnitude of 5.85,[2] making it faintly visible to the naked eye under ideal conditions. The object is located relatively close at a distance of 264 light-years based on Gaia DR3 parallax measurements,[1] and it is currently approaching the Solar System with a poorly constrained heliocentric radial velocity of −4 km/s.[6] At its current distance, HD 166114's brightness is diminished by an extinction of 0.31 magnitudes[15] and it has an absolute magnitude of +1.28.[7]

HD 166114
Location of HD 166114 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 18h 11m 05.56282s[1]
Declination −41° 21′ 32.8142″[1]
Apparent magnitude (V) 5.85±0.01[2]
Characteristics
Spectral type F2 V[3] or F0 Vn[4]
B−V color index +0.29[5]
Astrometry
Radial velocity (Rv)−4±4.3[6] km/s
Proper motion (μ) RA: +30.884 mas/yr[1]
Dec.: −37.254 mas/yr[1]
Parallax (π)12.3631 ± 0.2238 mas[1]
Distance264 ± 5 ly
(81 ± 1 pc)
Absolute magnitude (MV)+1.28[7]
Details
Mass1.68[8] M☉
Radius3.14±0.16[9] R☉
Luminosity25.6±0.9[1] L☉
Surface gravity (log g)3.80+0.09
−0.08[10] cgs
Temperature7,465±254[8] K
Metallicity [Fe/H]−0.09[11] dex
Age1.20[8] Gyr
Other designations
2 G. Coronae Australis[12], CD−41°12491, CPD−41°8614, FK5 3444, GC 24769, HD 166114, HIP 89099, HR 6786, SAO 228778[13]
Database references
SIMBADdata

HD 166114 has a stellar classification of either F2 V[3] or F0 Vn[4]—both indicating that it is a F-type main-sequence star. The second class also displays a presence of nebulous or broad absorption lines due to rapid rotation. Abt and Morell (1995) give a class of A8 IV,[16] instead indicating that it is a slightly evolved A-type subgiant. Gaia DR3 models it to be a rather evolved main sequence star.[1]

The object has 1.68 times the mass of the Sun[8] and a slightly enlarged radius of 3.14 R☉.[9] It radiates 25.6 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 7,465 K.[8] HD 166114 is slightly metal deficient with an iron abundance 81% that of the Sun ([Fe/H] = −0.09)[11] and it is estimated to be 1.2 billion years old.[8]

References
  1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. 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. S2CID 17128864.
  3. Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. Vol. 2. Bibcode:1978mcts.book.....H.
  4. Evans, D. S. (1966). "Fundamental data for Southern stars (6th list)". Royal Greenwich Observatory Bulletins. 110: 185. Bibcode:1966RGOB..110..185E.
  5. Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  6. 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.
  7. 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 119257644.
  8. David, Trevor J.; Hillenbrand, Lynne A. (12 May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. eISSN 1538-4357. S2CID 33401607.
  9. Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361.
  10. 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. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.
  11. Netopil, Martin (4 May 2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society. 469 (3): 3042–3055. arXiv:1705.00883. Bibcode:2017MNRAS.469.3042N. doi:10.1093/mnras/stx1077. eISSN 1365-2966. ISSN 0035-8711. S2CID 119034918.
  12. Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  13. "HD 166114". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 25, 2023.
  14. Eggleton, P. P.; Tokovinin, A. A. (11 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. eISSN 1365-2966. ISSN 0035-8711. S2CID 14878976.
  15. Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.
  16. Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182. ISSN 0067-0049.
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