Psi2 Draconis

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
Distance1,060 ± 70 ly
(320 ± 20 pc)
Absolute magnitude (MV)−2.12±0.14[5]
Details[4]
Mass2.02 M☉
Luminosity534[6] L☉
Surface gravity (log g)2.32 cgs
Temperature6,874±259 K
Metallicity [Fe/H]−1.29 dex
Age800 Myr
Other designations
ψ2 Dra, 34 Dra, BD+72° 818, FK5 3429, HD 164613, HIP 87728, HR 6725, SAO 8961[7]
Database references
SIMBADdata

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. 1 2 3 4 5 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.
  2. 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.
  3. 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.
  4. 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, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276.
  5. ↑ 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.
  6. ↑ McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427: 343, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  7. ↑ "psi02 Dra -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-05-29.
  8. ↑ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
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