14 Herculis

14 Herculis or 14 Her is the Flamsteed designation of a K-type main-sequence star approximately 58.5 light-years away in the constellation Hercules. Because of its apparent magnitude, the star cannot be seen with the naked eye. As of 2006, it is thought that 14 Herculis has two extrasolar planets in orbit around the star.

14 Herculis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Hercules
Right ascension  16h 10m 24.3153s[1]
Declination +43° 49′ 03.4987″[1]
Apparent magnitude (V) +6.61[2]
Characteristics
Spectral type K0 V[3]
B−V color index 0.877±0.006[2]
Astrometry
Radial velocity (Rv)−13.87±0.08[2] km/s
Proper motion (μ) RA: 132.019±0.039[1] mas/yr
Dec.: −296.464±0.43[1] mas/yr
Parallax (π)55.7363 ± 0.0226[1] mas
Distance58.52 ± 0.02 ly
(17.942 ± 0.007 pc)
Absolute magnitude (MV)+5.39[2]
Details
Mass0.9[4] M☉
Radius0.8668±0.0324[5] R☉
Luminosity0.6256±0.0077[5] L☉
Surface gravity (log g)4.42[6] cgs
Temperature5518±102[5] K
Metallicity [Fe/H]0.43±0.08[4] dex
Age3.6±2.0[7] Gyr
Other designations
14 Her, BD+44° 2549, GJ 614, HD 145675, HIP 79248, SAO 45933, LTT 14816[8]
Database references
SIMBADdata

Stellar components

14 Herculis is an orange dwarf star of the spectral type K0V. It is thought that the star has 90 percent of the mass, 71 percent of the radius, and only 36 percent of the luminosity of the Sun. The star appears to be 2.7 times as enriched with elements heavier than hydrogen (based on its abundance of iron), in comparison to the Sun. It may be most metal rich star as known in 2001.[9]

Planetary system

In 1998 a planet was discovered orbiting 14 Herculis.[10] The planet's eccentric orbital period is 4.8 years.[4] In 2005, a possible second planet was proposed, designated 14 Herculis c.[11] The parameters of this planet are uncertain, but a recent analysis suggests it may lie in the 4:1 resonance with the inner planet, with an orbital period of almost 19 years at an orbital distance of 6.9 AU.[4]

The 14 Herculis planetary system[4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥4.64 ± 0.19 MJ 2.77 ± 0.05 1773.4 ± 2.5 0.369 ± 0.005 — —
c ≥2.1 MJ 6.9 6906 ± 70 0 (fixed) — —

See also

References
  1. 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.
  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.
  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. Wittenmyer, Robert A.; et al. (January 2007). "Long-Period Objects in the Extrasolar Planetary Systems 47 Ursae Majoris and 14 Herculis". The Astrophysical Journal. 654 (1): 625–632. arXiv:astro-ph/0609117. Bibcode:2007ApJ...654..625W. doi:10.1086/509110.
  5. von Braun, Kaspar; et al. (2014). "Stellar diameters and temperatures - V. 11 newly characterized exoplanet host stars". Monthly Notices of the Royal Astronomical Society. 438 (3): 2413–2425. arXiv:1312.1792. Bibcode:2014MNRAS.438.2413V. doi:10.1093/mnras/stt2360.
  6. Santos, N. C.; et al. (August 2013), "SWEET-Cat: A catalogue of parameters for Stars With ExoplanETs. I. New atmospheric parameters and masses for 48 stars with planets", Astronomy & Astrophysics, 556: 11, arXiv:1307.0354, Bibcode:2013A&A...556A.150S, doi:10.1051/0004-6361/201321286, A150.
  7. Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy & Astrophysics. 575 (A18): 17. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951.
  8. "14 Her". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-18.
  9. S. Feltzing and G. Gonzalez, "The nature of super-metal-rich stars* Detailed abundance analysis of 8 super-metal-rich star candidates", 2001
  10. Mayor, M.; et al. (1998). "Searching for giant planets at the Haute-Provence Observatory". In Hearnshaw, J. B.; Scarfe, C. D. (eds.). Precise Stellar Radial Velocities. IAU Colloqu. 170. San Francisco: ASP.
  11. Goździewski, K.; Konacki, M.; Maciejewski, A. J. (2006). "Orbital Configurations and Dynamical Stability of Multiplanet Systems around Sun-like Stars HD 202206, 14 Herculis, HD 37124, and HD 108874" (PDF). The Astrophysical Journal. 645 (1): 688–703. arXiv:astro-ph/0511463. Bibcode:2006ApJ...645..688G. doi:10.1086/504030.

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