HD 215456

HD 215456 is a star in the southern constellation Grus. It is a dim, yellow-hued star that lies just below the normal limit for visibility to the naked eye with an apparent visual magnitude of 6.63.[2] The distance to this star is 129 light years based on parallax, and it has an absolute magnitude of 3.73.[2] It is drifting closer with a radial velocity of −18.9 km/s.[1]

HD 215456
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Grus
Right ascension  22h 46m 08.03428s[1]
Declination −48° 58′ 43.7624″[1]
Apparent magnitude (V) 6.63[2]
Characteristics
Evolutionary stage Main sequence
Spectral type G0.5V[3]
B−V color index 0.636±0.006[2]
Astrometry
Radial velocity (Rv)−18.923±0.0003[1] km/s
Proper motion (μ) RA: +207.608[1] mas/yr
Dec.: −47.958[1] mas/yr
Parallax (π)25.2196 ± 0.0484[1] mas
Distance129.3 ± 0.2 ly
(39.65 ± 0.08 pc)
Absolute magnitude (MV)3.73[2]
Details
Mass1.207±0.060[4] M☉
Radius1.71±0.03[1] R☉
Luminosity3.020±0.008[1] L☉
Surface gravity (log g)4.12[3] cgs
Temperature5,818+45
−46[1] K
Metallicity [Fe/H]−0.07±0.03[2] dex
Rotational velocity (v sin i)2.3±0.2[5] km/s
Age7.5+0.7
−0.8[2] Gyr
Other designations
CD−49°13955, FK5 6008, HD 215456, HIP 112414, SAO 231285, NLTT 54757[6]
Database references
SIMBADdata

This object is a solar-type main-sequence star with a stellar classification of G0.5V.[3] It is about 7.5[2] billion years old with a projected rotational velocity of 2.3 km/s.[5] The star has 1.2[4] times the mass of the Sun and 1.7[1] times the Sun's radius. The metallicity, or abundance of elements with higher atomic numbers than helium, is slightly below solar.[2] The star is radiating triple the luminosity of the Sun from its photosphere at an effective temperature of 5,818 K.[1]

HD 215456 has two candidate planets that are around 32 and 76 times as massive as the earth with orbital periods of just under 192 and 2226 days, respectively. These were detected by the HARPS survey in 2011.[7] The two planets were listed as confirmed in 2020.

The HD 215456 planetary system[8][9]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >0.101 MJ 0.652 191.99 0.15 — —
c >0.246 MJ 3.394 2277 0.19 — —

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. Gray, R. O.; et al. (2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637.
  4. Pinheiro, F. J. G.; et al. (December 2014), "On the mass estimation for FGK stars: comparison of several methods", Monthly Notices of the Royal Astronomical Society, 445 (3): 2223–2231, Bibcode:2014MNRAS.445.2223P, doi:10.1093/mnras/stu1812.
  5. Soto, M. G.; Jenkins, J. S. (2018), "Spectroscopic Parameters and atmosphEric ChemIstriEs of Stars (SPECIES). I. Code description and dwarf stars catalogue", Astronomy and Astrophysics, 615: A76, arXiv:1801.09698, Bibcode:2018A&A...615A..76S, doi:10.1051/0004-6361/201731533.
  6. "HD 215456". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-10.
  7. Mayor, M.; et al. (September 2011), The HARPS Search for Southern Extra-solar Planets XXXIV. Occurrence, Mass Distribution and Orbital Properties of Super-Earths and Neptune-mass Planets, arXiv:1109.2497, Bibcode:2011arXiv1109.2497M.
  8. exoplanet.eu HD 215456 b
  9. exoplanet.eu HD 215456 c
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