14 Sagittarii

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14 Sagittarii
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
Distance450 ± 30 ly
(139 ± 8 pc)
Absolute magnitude (MV)−0.21[4]
Details
Luminosity317.37[4] L
Surface gravity (log g)1.7[2] cgs
Temperature3,940[2] K
Metallicity [Fe/H]−0.26[2] dex
Other designations
14 Sgr, NSV 10393, BD−21° 4916, HD 167036, HIP 89369, HR 6816, SAO 186509[5]
Database references
SIMBADdata

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]

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[edit]

  1. ^ a b c d e f van Leeuwen, F. (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 d e f Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069Freely accessible, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247. 
  3. ^ a b 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. 
  4. ^ a b c d e f g h Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971Freely accessible, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. 
  5. ^ "14 Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-15. 
  6. ^ 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:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.