Psi2 Draconis
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Draco |
Right ascension | 17h 55m 11.15363s[1] |
Declination | +72° 00′ 18.4602″[1] |
Apparent magnitude (V) | 5.45[2] |
Characteristics | |
Spectral type | F2 III+[3] |
U−B color index | +0.15[2] |
B−V color index | +0.30[2] |
Astrometry | |
Radial velocity (Rv) | −2.0[4] km/s |
Proper motion (μ) | RA: +8.33[1] mas/yr Dec.: −2.48[1] mas/yr |
Parallax (π) | 3.09 ± 0.20[1] mas |
Distance | 1,060 ± 70 ly (320 ± 20 pc) |
Absolute magnitude (MV) | ±0.14 −2.12[5] |
Details[4] | |
Mass | 2.02 M☉ |
Luminosity | 534[6] L☉ |
Surface gravity (log g) | 2.32 cgs |
Temperature | ±259 6,874 K |
Metallicity [Fe/H] | −1.29 dex |
Age | 800 Myr |
Other designations | |
Database references | |
SIMBAD | data |
Psi2 Draconis is a solitary[8] star in the northern circumpolar constellation of Draco. Its apparent magnitude is 5.45.[2] Located around 324 parsecs (1,060 ly) distant, it is a white giant of spectral type F2III+,[3] a star that has used up its core hydrogen and has expanded.
References
- 1 2 3 4 5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.
- 1 2 3 4 Oja, T. (April 1983), "UBV photometry of FK4 and FK4 supplement stars", Astronomy and Astrophysics Supplement Series, 52: 1311−34, Bibcode:1983A&AS...52..131O.
- 1 2 Gray, R. O.; et al. (April 2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal, 121 (4): 2148–2158, Bibcode:2001AJ....121.2148G, doi:10.1086/319956.
- 1 2 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, Bibcode:2011A&A...530A.138C, arXiv:1103.4651 , doi:10.1051/0004-6361/201016276.
- ↑ 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, Bibcode:2009A&A...501..941H, arXiv:0811.3982 , doi:10.1051/0004-6361/200811191.
- ↑ McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427: 343, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037 , doi:10.1111/j.1365-2966.2012.21873.x.
- ↑ "psi02 Dra -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-05-29.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x.
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