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58 Hydrae

Topic: Astronomy

 From HandWiki - Reading time: 5 min

Short description: Star in the constellation Hydra
58 Hydrae
Location of 58 Hydrae (circled in red)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Hydra[1]
Right ascension  14h 50m 17.30146s[2]
Declination −27° 57′ 37.3385″[2]
Apparent magnitude (V) 4.42[1]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type K2.5 IIIb Fe-1:[4]
B−V color index 1.366±0.050[1]
Astrometry
Radial velocity (Rv)−8.7±1.5[1] km/s
Proper motion (μ) RA: −232.696[2] mas/yr
Dec.: −60.118[2] mas/yr
Parallax (π)11.4440 ± 0.5105[2] mas
Distance290 ± 10 ly
(87 ± 4 pc)
Absolute magnitude (MV)−0.60[1]
Details
Mass0.88[3] M☉
Radius33.40+0.41
−1.13[2] R☉
Luminosity310.19[3] L☉
Surface gravity (log g)1.35[3] cgs
Temperature4,210[3] K
Metallicity [Fe/H]−0.43±0.04[1] dex
Rotational velocity (v sin i)4.23[5] km/s
Age8.1[3] Gyr
Other designations
Solitaire, E Hya, 58 Hya, CD−27°10073, HD 130694, HIP 72571, HR 5526, SAO 182911, LTT 5887[6]
Database references
SIMBADdata

58 Hydrae, also named Solitaire,[7] is a single[8] star in the equatorial constellation of Hydra, located around 290 light years away from the Sun based on parallax.[2] It has the Bayer designation E Hydrae; 58 Hydrae is the Flamsteed designation − a later designation of 6 Librae.[9] It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.42.[1] This object is moving closer to the Earth with a heliocentric radial velocity of −9 km/s.[1]

This is an aging giant star with a stellar classification of K2.5 IIIb Fe-1:,[4] most likely (98% chance) on the red giant branch.[3] The suffix notation indicates an underabundance of iron in the spectrum, and some uncertainty about the classification. It is around 8.1 billion years old with 0.88 times the mass of the Sun.[3] As a consequence of exhausting the hydrogen at its core, the star has expanded to 33.4[2] times the Sun's radius. It is radiating 310 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,210 K.[3]

This star was a member of the obsolete constellation Turdus Solitarius, which was named after the Rodrigues solitaire, a now extinct species of bird, though in old star charts it was illustrated as a blue rock thrush.[10] The IAU Working Group on Star Names approved the name Solitaire for this star on 31 October 2024, after the obsolete constellation, and it is now so entered in the IAU Catalog of Star Names.[7]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 Stock, S. et al. (August 2018), "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search", Astronomy & Astrophysics 616: 15, doi:10.1051/0004-6361/201833111, A33, Bibcode: 2018A&A...616A..33S. 
  4. ↑ 4.0 4.1 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K. 
  5. ↑ Hekker, S.; Meléndez, J. (2007). "Precise radial velocities of giant stars. III. Spectroscopic stellar parameters". Astronomy and Astrophysics 475 (3): 1003. doi:10.1051/0004-6361:20078233. Bibcode: 2007A&A...475.1003H. 
  6. ↑ "E Hya". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=E+Hya. 
  7. ↑ 7.0 7.1 "IAU Catalog of Star Names". https://exopla.net/star-names/modern-iau-star-names/. 
  8. ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  9. ↑ Wagman, M. (August 1987), "Flamsteed's Missing Stars", Journal for the History of Astronomy 18 (3): 218, doi:10.1177/002182868701800305, Bibcode: 1987JHA....18..209W 
  10. ↑ Ridpath, Ian. "Star Tales – Turdus Solitarius". http://www.ianridpath.com/startales/solitaire.html. 



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