Tau2 Gruis
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.
| 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 |
References
- 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, S2CID 18759600.
- 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, S2CID 118577511.
- Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, 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.
- 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, S2CID 56118016.
- "HD 216655". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-24.
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