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] |
| Distance | 145 ± 1 ly (44.4 ± 0.3 pc) |
| Absolute magnitude (MV) | 2.92[7] |
| Details | |
| Mass | 1.35[8] M☉ |
| Radius | 1.79+0.04 −0.10[1] R☉ |
| Luminosity | 6.109±0.054[1] L☉ |
| Surface gravity (log g) | 3.99[3] cgs |
| Temperature | 6,806[3] K |
| Metallicity [Fe/H] | –0.21[3] dex |
| Age | 1.8[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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
[edit]- ^ a b c d e f g 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.
- ^ 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.
- ^ a b c d e f 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.
- ^ a b "* 39 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-16.
- ^ Wilson, Ralph Elmer (1953), "General catalogue of stellar radial velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
- ^ a b c 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.
- ^ a b c 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.
- ^ a b 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.
- ^ 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.
