HD 166066

HD 166066
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 18h 38m 51.0741s[1]
Declination −85° 42′ 32.2260″[1]
Apparent magnitude (V) 8.10±0.01[2]
Characteristics
Spectral type G0 V[3]
B−V color index +0.59[2]
Astrometry
Radial velocity (Rv)2.93±2.55[4] km/s
Proper motion (μ) RA: +147.318 mas/yr[1]
Dec.: −43.097 mas/yr[1]
Parallax (π)14.5962 ± 0.1186 mas[1]
Distance223 ± 2 ly
(68.5 ± 0.6 pc)
Absolute magnitude (MV)4.09[5]
Details
Mass1.13[6] M☉
Radius1.39+0.07
−0.05[7] R☉
Luminosity2.12[5] L☉
Surface gravity (log g)4.25[6] cgs
Temperature6,054±80[6] K
Metallicity [Fe/H]−0.03[6] dex
Rotational velocity (v sin i)5[8] km/s
Age7.0+2.5
−1.2[9] Gyr
Other designations
CD−85°150, CPD−85°478, HD 166066, HIP 91434, GSC 09527-01174[10]
Database references
SIMBADdata

HD 166066 is a solitary star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 8.10,[2] making it readily visible in binoculars, but not to the naked eye. The object is located 223 light years away from the Solar System,[1] but is drifting away with a poorly constrained radial velocity of about 2.93 km/s.[4]

HD 166066 has a stellar classification of G0 V, indicating that it is a G-type main sequence star similar to the Sun.[3] However, the calcium H & K lines are narrow and weak for its class.[3] It has 113% the mass of the Sun[6] and 139% its radius, along with twice its luminosity.[5][7]

The iron abundance is 93% that of the Sun, and is slightly hotter, with an effective temperature of 6,054 K[6] compared to the Sun's 5,778 K. HD 166066 is significantly older, with an age of 7 billion years,[9] and rotates modestly with a projected rotational velocity of 5 km/s.[8]

References

  1. ^ 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.
  2. ^ a b c 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.
  3. ^ a b c Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.
  4. ^ 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.
  5. ^ a b c 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.
  6. ^ a b c d e f Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (June 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey⋆". Astronomy & Astrophysics. 530: A138. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276. ISSN 0004-6361.
  7. ^ a b 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.
  8. ^ a b Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S.; Mowlavi, N. (May 2004). "The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of ~14 000 F and G dwarfs". Astronomy & Astrophysics. 418 (3): 989–1019. arXiv:astro-ph/0405198. Bibcode:2004A&A...418..989N. doi:10.1051/0004-6361:20035959. ISSN 0004-6361.
  9. ^ a b Holmberg, J.; Nordström, B.; Andersen, J. (July 2009). "The Geneva-Copenhagen survey of the solar neighbourhood: III. Improved distances, ages, and kinematics". Astronomy & Astrophysics. 501 (3): 941–947. arXiv:0811.3982. Bibcode:2009A&A...501..941H. doi:10.1051/0004-6361/200811191. ISSN 0004-6361.
  10. ^ "HD 166066". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 25, 2022.

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