59 Sagittarii

59 Sagittarii is a single[9] star in the southern constellation of Sagittarius,[8] about a degree to the south of Omega Sagittarii near the constellation border with Capricornus. It has the Bayer designation b Sagittarii, or sometimes b1 Sagittarii,[10] while 59 Sagittarii is the Flamsteed designation. The star is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.544. It forms the southeast corner of the asterism called the Terebellum. Based upon parallax measurements, the star is located approximately 830 light years away from the Sun.[1] It is moving closer to the Earth with a heliocentric radial velocity of −16 km/s.[2]

This article is about b Sagittarii. It is not to be confused with β (beta) Sagittarii.
59 Sagittarii

The four stars of the Terebellum
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sagittarius
Right ascension 19h 56m 56.83165s[1]
Declination −27° 10′ 11.6409″[1]
Apparent magnitude (V) 4.54[2]
Characteristics
Spectral type K2.5IIb[3]
U−B color index +1.462±0.048[2]
B−V color index +1.46[4]
R−I color index +0.73[4]
Astrometry
Radial velocity (Rv)−16.4±0.9[2] km/s
Proper motion (μ) RA: +10.46[1] mas/yr
Dec.: −15.52[1] mas/yr
Parallax (π)3.92 ± 0.28 mas[1]
Distance830 ± 60 ly
(260 ± 20 pc)
Absolute magnitude (MV)−2.48[2]
Details
Mass6.2±0.1[5] M☉
Radius100.19+4.73
−6.60[6] R☉
Luminosity2,825±287[6] L☉
Surface gravity (log g)1.78[7] cgs
Temperature4,204+146
−96[6] K
Metallicity [Fe/H]−0.10±0.06[2] dex
Age64.2±17.7[5] Myr
Other designations
b Sgr, 59 Sgr, CD−27°14399, CPD−27°6892, GC 27605, HD 188603, HIP 98162, HR 7604, SAO 188742, PPM 270473[8]
Database references
SIMBADdata

This is an aging bright giant star with a stellar classification of K2.5IIb,[3] having exhausted the supply of hydrogen at its core and expanded to 100[6] times the radius of the Sun. It is 64[5] million years old with 6.2[5] times the Sun's mass. The star is radiating 2,825[6] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,204 K.[6]

References
  1. 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. S2CID 18759600.
  2. 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. S2CID 119257644.
  3. Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  4. Hoffleit, D.; Warren, Jr., W. H. "HR 7604, database entry, The Bright Star Catalogue" (5th Revised ed.). CDS. Retrieved 2009-11-19. V/50.
  5. Tetzlaff, N.; et al. (January 2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID 118629873.
  6. 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.
  7. McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527
  8. "b Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-27.
  9. 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. S2CID 14878976.
  10. Kostjuk, N. D. (2002). "HD 188603, database record, HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index". Institute of Astronomy of Russian Academy of Sciences. Retrieved 2009-11-19. CDS ID IV/27
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