Psi2 Draconis

Psi2 Draconis is a solitary[9] giant star in the northern circumpolar constellation of Draco, also designated 34 Draconis. It lies about a degree east of the brighter Psi1 Draconis.

For other stars with this Bayer designation, see ψ 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)3.4888 ± 0.0832[5] mas
Distance930 ± 20 ly
(287 ± 7 pc)
Absolute magnitude (MV)−2.12±0.14[6]
Details[4]
Mass2.02 M☉
Luminosity534[7] 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[8]
Database references
SIMBADdata

Psi2 Draconis has an apparent magnitude of 5.45.[2] and is located around 287 parsecs (940 ly) away. It is a white giant of spectral type F2III+,[3] a star that has used up its core hydrogen, cooled, and expanded away from the main sequence. It is now over 500 times as luminous as the sun.

References
  1. 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. 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. 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. 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. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  6. 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.
  7. McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  8. "psi02 Dra -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-05-29.
  9. 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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