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HD 122430 is single star[6] in the equatorial constellation of Hydra. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of 5.47.[2] The star is located at a distance of 105.6 light years from the Sun based on parallax.

HD 122430
Observation data
Epoch J2000      Equinox J2000
Constellation Hydra
Right ascension 14h 02m 22.78173s[1]
Declination −27° 25′ 47.1992″[1]
Apparent magnitude (V) 5.47[2]
Characteristics
Spectral type K2–3III[3]
B−V color index 1.331±0.003[2]
Astrometry
Radial velocity (Rv)−0.61±0.24[1] km/s
Proper motion (μ) RA: −31.861±0.259[1] mas/yr
Dec.: −4.195±0.215[1] mas/yr
Parallax (π)7.3651 ± 0.1407 mas[1]
Distance443 ± 8 ly
(136 ± 3 pc)
Absolute magnitude (MV)−0.17[2]
Details[4]
Mass1.62±0.19 M☉
Radius21.20±2.06 R☉
Luminosity189.6±4.2[1] L☉
Surface gravity (log g)1.96±0.07 cgs
Temperature4,383±19 K
Metallicity [Fe/H]−0.08±0.04 dex
Rotational velocity (v sin i)2.59±0.45 km/s
Age1.98±0.67 Gyr
Other designations
CD−26° 10060, GC 18954, HD 122430, HIP 68581, HR 5265, SAO 182182, GCRV 8247[5]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

This is an aging giant star with a stellar classification of K2–3III.[3] It has completely run out of the hydrogen fuel that keeps it stable, although it is only two billion years old,[4] younger than the Sun's 4.6 billion years. HD 122430 has a mass of 1.6 times and radius of 22.9 times that of the Sun.[4] Despite its younger age, it has slightly lower metallicity, approximately 90%. It is radiating 190[1] times the luminosity of the Sun from its photosphere at an effective temperature of 4300 K.[4]

A candidate exoplanet was reported orbiting the star via the radial velocity method at a conference in 2003, and designated HD 122430 b. It has an orbital period of 0.94 years and an eccentricity of 0.68.[7] However, a follow-up study by Soto et al. (2015) failed to detect a signal, so it remains unconfirmed.[8]

The HD 122430 planetary system[7]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b (unconfirmed) >3.71 MJ 1.02 344.95±1.08 0.68±0.09 — —

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. S2CID 119257644.
  3. Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 3. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. Bibcode:1982mcts.book.....H.
  4. Jofré, E.; et al. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets". Astronomy & Astrophysics. 574: A50. arXiv:1410.6422. Bibcode:2015A&A...574A..50J. doi:10.1051/0004-6361/201424474. S2CID 53666931.
  5. "HD 117207". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-23.
  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:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  7. Setiawan, J. (October 2003). Planets around evolved stars. Proceedings of the Conference on Towards Other Earths: DARWIN/TPF and the Search for Extrasolar Terrestrial Planets, 22–25 April 2003, Heidelberg, Germany. Vol. 539. Noordwijk, Netherlands: ESA Publications Division. pp. 595–598. Bibcode:2003ESASP.539..595S. ISBN 92-9092-849-2.
  8. Soto, M. G.; et al. (August 2015). "RAFT - I. Discovery of new planetary candidates and updated orbits from archival FEROS spectra". Monthly Notices of the Royal Astronomical Society. 451 (3): 3131–3144. arXiv:1505.04796. Bibcode:2015MNRAS.451.3131S. doi:10.1093/mnras/stv1144.


На других языках

[de] HD 122430

HD 122430 ist ein etwa 440 Lichtjahre von der Erde entfernter Riese der Spektralklasse K im Sternbild Hydra. Er besitzt eine scheinbare Helligkeit von 5,5 mag. Im Jahre 2003 publizierten Setiawan et al. die Entdeckung eines extrasolaren Planeten, der diesen Stern umkreist und die systematische Bezeichnung HD 122430 b trägt. Die Umlaufperiode des mit Hilfe der Radialgeschwindigkeitsmethode gefundenen Begleiters beträgt rund 345 Tage und die große Halbachse seiner Bahn misst ca. eine Astronomische Einheit.
- [en] HD 122430

[ru] HD 122430

HD 122430 — звезда, которая находится в созвездии Гидра на расстоянии около 440 световых лет от нас. Вокруг звезды обращается, как минимум, одна планета.


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