66 Andromedae

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66 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  02h 27m 51.77866s[1]
Declination +50° 34′ 11.9054″[1]
Apparent magnitude (V) 6.16[2] (7.26/7.46)[3]
Spectral type F4 V[3]
B−V color index 0.435 (4.2/4.5)[3]
Radial velocity (Rv)−5.3±4.3[3] km/s
Proper motion (μ) RA: +32.23±0.38[1] mas/yr
Dec.: −90.71±0.35[1] mas/yr
Parallax (π)17.69 ± 0.42[1] mas
Distance184 ± 4 ly
(57 ± 1 pc)
Absolute magnitude (MV)3.1±0.1/3.4±0.1[3]
Period (P)10.989861±0.000024 d
Eccentricity (e)0.19236±0.00057
Periastron epoch (T)2,454,007.675±0.006 JD
Argument of periastron (ω)
Semi-amplitude (K1)
46.719±0.034 km/s
Semi-amplitude (K2)
48.083±0.038 km/s
66 And A
Mass1.38 M
Radius1.7±0.1 R
Luminosity4.9±0.5 L
Surface gravity (log g)4.21[4] cgs
Temperature6,627±225[4] K
Metallicity [Fe/H]−0.14±0.08[2] dex
Rotational velocity (v sin i)4.2±1.0 km/s
Age1.273[4] Gyr
66 And B
Radius1.5±0.1 R
Luminosity3.8±0.4 L
Rotational velocity (v sin i)4.4±1.0 km/s
Other designations
66 And, BD+49° 666, HD 15138, HIP 11465, HR 709, SAO 23353[5]
Database references

66 Andromedae is a binary star[3] in the constellation Andromeda. The designation is from the star catalogue of English astronomer John Flamsteed, first published in 1712, it has a combined apparent magnitude of 6.16,[2] which is just below the nominal brightness limit of stars that are visible to the naked eye under good seeing conditions. An annual parallax shift of 17.69 mas provides a distance estimate of around 184 light years. This is a double-lined spectroscopic binary system with an orbital period of 11 days and an eccentricity of 0.19.[3] The two components are similar stars with a combined stellar classification of F4 V,[3] matching that of an F-type main sequence star.


  1. ^ a b c d e 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. ^ a b c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  3. ^ a b c d e f g h i j Fekel, Francis C.; et al. (April 2010), "New Precision Orbits of Bright Double-lined Spectroscopic Binaries. IV. 66 Andromedae, HR 6979, and HR 9059", The Astronomical Journal, 139 (4): 1579−1591, Bibcode:2010AJ....139.1579F, doi:10.1088/0004-6256/139/4/1579.
  4. ^ a b c David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  5. ^ "66 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-02.

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