Astronomy:HD 166066

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Short description: Star in the constellation Octans
HD 166066
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
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[1] mas/yr
Dec.: −43.097[1] mas/yr
Parallax (π)14.5962 ± 0.1186[1] mas
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 km/s.[8]

References

  1. 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. 2.0 2.1 2.2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode2000A&A...355L..27H. 
  3. 3.0 3.1 3.2 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.. Bibcode1975mcts.book.....H. 
  4. 4.0 4.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  5. 5.0 5.1 5.2 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode2012AstL...38..331A. 
  6. 6.0 6.1 6.2 6.3 6.4 6.5 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. doi:10.1051/0004-6361/201016276. ISSN 0004-6361. Bibcode2011A&A...530A.138C. 
  7. 7.0 7.1 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode2019AJ....158..138S. 
  8. 8.0 8.1 Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S. et al. (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. doi:10.1051/0004-6361:20035959. ISSN 0004-6361. Bibcode2004A&A...418..989N. 
  9. 9.0 9.1 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. doi:10.1051/0004-6361/200811191. ISSN 0004-6361. Bibcode2009A&A...501..941H. 
  10. "HD 166066". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+166066.