39 Aquarii

39 Aquarii is a star in the zodiac 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,[6] this star is at a distance of around 137 light-years (42 parsecs) from Earth. 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°.[9]

39 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 12m 25.76398s[1]
Declination −14° 11′ 38.3009″[1]
Apparent magnitude (V) 6.03[2]
Characteristics
Spectral type F0 V[3]
U−B color index +0.00[4]
B−V color index +0.38[2]
Astrometry
Radial velocity (Rv)+15.2[5] km/s
Proper motion (μ) RA: +23.89[6] mas/yr
Dec.: -47.43[6] mas/yr
Parallax (π)22.5378 ± 0.1723 mas[1]
Distance145 ± 1 ly
(44.4 ± 0.3 pc)
Absolute magnitude (MV)2.92[7]
Details
Mass1.35[8] M☉
Radius1.79+0.04
−0.10[1] R☉
Luminosity6.109±0.054[1] L☉
Surface gravity (log g)3.99[3] cgs
Temperature6,806[3] K
Metallicity [Fe/H]–0.21[3] dex
Age1.8[7] Gyr
Other designations
39 Aqr, BD−14° 6229, HD 210705, HIP 109624, HR 8462, SAO 164923[4]
Database references
SIMBADdata

The stellar classification of this star is F0 V;[3] hence it belongs to the category of F-type main sequence stars that generate energy through hydrogen fusion at the core. It is 1.8[7] billion years old with 1.35[8] times the mass of the Sun and 1.79[1] times the Sun's radius. The star is radiating 6.1[1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,806 K.[3]

References
  1. 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.
  2. 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. 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/0611618, Bibcode:2007MNRAS.374..664C, doi:10.1111/j.1365-2966.2006.11196.x, S2CID 119428437.
  4. "* 39 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-16.
  5. Wilson, Ralph Elmer (1953), "General catalogue of stellar radial velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
  6. van Leeuwen, F. (November 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, S2CID 18759600.
  7. 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 (3): 989–1019, arXiv:astro-ph/0405198, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959, S2CID 11027621.
  8. 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, S2CID 33401607.
  9. 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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