Tau2 Gruis
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 22h 55m 16.14624s[1] |
| Declination | −48° 27′ 56.8622″[1] |
| Apparent magnitude (V) | 7.035[2] (7.29 + 8.91)[3] |
| Characteristics | |
| Spectral type | G3/6[4] |
| Astrometry | |
| Radial velocity (Rv) | 0.9[5] km/s |
| Proper motion (μ) | RA: −227.04[1] mas/yr Dec.: +62.29[1] mas/yr |
| Parallax (π) | 20.97 ± 0.84 mas[1] |
| Distance | 156 ± 6 ly (48 ± 2 pc) |
| Absolute magnitude (MV) | 3.64[2] |
| Details[5] | |
| Mass | 1.11 M☉ |
| Surface gravity (log g) | 4.10 cgs |
| Temperature | 6,008 K |
| Metallicity [Fe/H] | −0.19 dex |
| Age | 6.3 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Tau2 Gruis (Tau2 Gruis), is a double star located in the constellation Grus. The somewhat faint double star can be located west of Beta Gruis. As of 2015, the pair had an angular separation of 0.60 arc seconds along a position angle of 176°.[3] The system is 156 light years from Earth. The two stars were assigned the designation Tau2 due to their proximity to Tau3 Grus, by Louis de Lacaille in his Coelum Australe Stelliferum.
References
- ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
- ^ a b Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191.
- ^ a b Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
- ^ Houk, N. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- ^ a b Casagrande, L.; et al. (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): 21, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276.
- ^ "HD 216655". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-24.
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