Astronomy: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 |
| Distance | 223 ± 2 ly (68.5 ± 0.6 pc) |
| Absolute magnitude (MV) | 4.09[5] |
| Details | |
| Mass | 1.13[6] M☉ |
| Radius | 1.39+0.07−0.05[7] R☉ |
| Luminosity | 2.12[5] L☉ |
| Surface gravity (log g) | 4.25[6] cgs |
| Temperature | 6,054±80[6] K |
| Metallicity [Fe/H] | −0.03[6] dex |
| Rotational velocity (v sin i) | 5[8] km/s |
| Age | 7.0+2.5−1.2[9] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- ↑ 1.0 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. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 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. Bibcode: 2000A&A...355L..27H.
- ↑ 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.. Bibcode: 1975mcts.book.....H.
- ↑ 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. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 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. Bibcode: 2012AstL...38..331A.
- ↑ 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. Bibcode: 2011A&A...530A.138C.
- ↑ 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. Bibcode: 2019AJ....158..138S.
- ↑ 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. Bibcode: 2004A&A...418..989N.
- ↑ 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. Bibcode: 2009A&A...501..941H.
- ↑ "HD 166066". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+166066.
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