6 Equulei

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6 Equulei
Observation data
Epoch J2000 (ICRS)      Equinox J2000 (ICRS)
Constellation Equuleus
Right ascension 21h 10m 31.31410s[1]
Declination 10° 02′ 56.1112″[1]
Apparent magnitude (V) 6.07[2]
Spectral type A2 Vs[3] (A1 Si Sr Cr)[4]
U−B color index +0.04[2]
B−V color index +0.02[2]
Radial velocity (Rv) +6.9[5] km/s
Proper motion (μ) RA: –0.50[1] mas/yr
Dec.: +16.40[1] mas/yr
Parallax (π) 7.36 ± 0.81[1] mas
Distance approx. 440 ly
(approx. 140 pc)
Absolute magnitude (MV) +0.236[3]
Mass 2.4[3] M
Radius 1.7[6] R
Luminosity 59[3] L
Temperature 9000[3] K
Rotational velocity (v sin i) 65[7] km/s
Age 970[3] Myr
Other designations
γ Equulei D, BD+09 4735, HD 201616, HIP 104538, HR 8098, SAO 126597.[8]
Database references

6 Equulei is an A-type main sequence star in the constellation of Equuleus with an apparent magnitude of 6.07.

6 Equulei is an optical double of Gamma Equulei, at a separation of 339.13 arcseconds. 6 Equulei is also known as Gamma Equulei D;[citation needed] however this doesn't mean it orbits Gamma Equulei A, B, C, as in Celestia it shows 6 Equulei is separated at about 0.18 light years from the Gamma Equulei triple star system.


  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J 
  3. ^ a b c d e f "HD 104538", WolframAlpha, retrieved 2012-08-05 
  4. ^ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788. 
  5. ^ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W. 
  6. ^ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367: 521–524, Bibcode:2001A&A...367..521P, arXiv:astro-ph/0012289Freely accessible, doi:10.1051/0004-6361:20000451. 
  7. ^ Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, Bibcode:2007A&A...463..671R, arXiv:astro-ph/0610785Freely accessible, doi:10.1051/0004-6361:20065224. 
  8. ^ "6 Equ -- Star in double system", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-25. 

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