39 Aquarii

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39 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 12m 25.75608s[1]
Declination −14° 11′ 38.2442″[1]
Apparent magnitude (V) 6.03[2]
Spectral type F0 V[3]
U−B color index +0.00[4]
B−V color index +0.38[2]
Radial velocity (Rv) +15.2[5] km/s
Proper motion (μ) RA: +23.89[1] mas/yr
Dec.: -47.43[1] mas/yr
Parallax (π) 23.78 ± 0.72[1] mas
Distance 137 ± 4 ly
(42 ± 1 pc)
Absolute magnitude (MV) 2.92[6]
Surface gravity (log g) 3.99[3] cgs
Temperature 6,806[3] K
Metallicity [Fe/H] –0.21[3] dex
Age 1.8[6] Gyr
Other designations
BD-14 6229, HD 210705, HIP 109624, HR 8462, SAO 164923.[4]
Database references

39 Aquarii (abbreviated 39 Aqr) is a star in the constellation of Aquarius. 39 Aquarii is its Flamsteed designation. It is a faint naked eye star with an apparent visual magnitude of 6.03.[2] Based upon an annual parallax shift of 23.78 measured with a 3% margin of error,[1] this star is at a distance of around 137 light-years (42 parsecs) from Earth.

The stellar classification of this star is F0 V;[3] hence it belongs to the category of F-type main sequence stars. It is a double star with a magnitude 9.3 companion at an angular separation of 0.6 arcseconds along a position angle of 257°.[7]


  1. ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C. 
  3. ^ a b c d e Cenarro, A. J.; et al. (January 2007), "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters", Monthly Notices of the Royal Astronomical Society, 374 (2): 664–690, arXiv:astro-ph/0611618Freely accessible, Bibcode:2007MNRAS.374..664C, doi:10.1111/j.1365-2966.2006.11196.x. 
  4. ^ a b "39 Aqr -- Variable Star", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-16. 
  5. ^ Wilson, Ralph Elmer (1953), General catalogue of stellar radial velocities, Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W. 
  6. ^ a b Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics, 418: 989–1019, arXiv:astro-ph/0405198Freely accessible, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959. 
  7. ^ Fabricius, C.; Makarov, V. V. (April 2000), "Two-colour photometry for 9473 components of close Hipparcos double and multiple stars", Astronomy and Astrophysics, 356: 141–145, Bibcode:2000A&A...356..141F. 

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