14 Sagittarii
14 Sagittarii is a single,[6] orange-hued star in the southern zodiac constellation of Sagittarius. It is faintly visible to the naked eye under good seeing conditions, having an apparent visual magnitude of 5.49.[2] Based upon an annual parallax shift of 7.20±0.41 mas,[1] it is located some 450 light years away. The star is moving closer to the Sun with a heliocentric radial velocity of around −59 km/s.[4] It should achieve perihelion in about two million years, approaching as close as 136.1 ly (41.72 pc).[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 14m 15.89989s[1] |
| Declination | −21° 42′ 47.3919″[1] |
| Apparent magnitude (V) | 5.491[2] |
| Characteristics | |
| Spectral type | K2 III[3] |
| B−V color index | 1.528±0.001[4] |
| Astrometry | |
| Radial velocity (Rv) | −58.9±2.8[4] km/s |
| Proper motion (μ) | RA: −16.27[1] mas/yr Dec.: −23.49[1] mas/yr |
| Parallax (π) | 7.20 ± 0.41[1] mas |
| Distance | 450 ± 30 ly (139 ± 8 pc) |
| Absolute magnitude (MV) | −0.21[4] |
| Details | |
| Luminosity | 317.37[4] L☉ |
| Surface gravity (log g) | 1.7[2] cgs |
| Temperature | 3,940[2] K |
| Metallicity [Fe/H] | −0.26[2] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an evolved giant star with a stellar classification of K2 III,[3] having exhausted the supply of hydrogen at its core and moved off the main sequence. It is a suspected variable star, possibly of the micro-variable variety, having an amplitude of less than 0.03 in magnitude.[4] 14 Sagittarii is radiating about 317[4] times the Sun's luminosity from its photosphere at an effective temperature of around 3,940 K.[2]
References
- 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.
- Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247.
- Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
- 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.
- "14 Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-15.
- Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.