Lambda Equulei

Lambda Equulei
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Equuleus
Right ascension 21h 02m 12.50262s[1]
Declination +07° 10′ 47.1545″[1]
Apparent magnitude (V) 6.698[2] (7.41 + 7.64)[3]
Characteristics
Spectral type F6V
B−V color index 0.50
Astrometry
Radial velocity (Rv)−4.8±1.6[4] km/s
Proper motion (μ) RA: −8.14[1] mas/yr
Dec.: −14.79[1] mas/yr
Parallax (π)12.35 ± 1.04[1] mas
Distance260 ± 20 ly
(81 ± 7 pc)
Absolute magnitude (MV)2.16±0.18[2]
Details
2 Equ A
Mass1.73[4] M☉
Surface gravity (log g)4.05[4] cgs
Temperature6,561±80[4] K
Metallicity [Fe/H]0.17[4] dex
Age1.6[4] Gyr
Other designations
λ Equ, 2 Equulei, BD+06° 4731, HD 200256, HIP 103813, LTT 16227, SAO 126643.[5]
Database references
SIMBADdata

λ Equulei (Latinised to Lambda Equulei, abbreviated to λ Equ or Lambda Equ) is a double star system in the constellation of Equuleus. The main component is a F-type main sequence star. As of 2015, the secondary had an angular separation of 2.90 arc seconds along a position angle of 213° from the primary.[3]

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 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.
  3. 1 2 Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22
  4. 1 2 3 4 5 6 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. ↑ "2 Equ -- Double or multiple star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-02-17.


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