HD 215456

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 mas[1]
Distance	129.3 ± 0.2 ly ; (39.65 ± 0.08 pc)
Absolute magnitude (MV)	3.73[2]
Details
Mass	1.207±0.060[4] M☉
Radius	1.71±0.03[1] R☉
Luminosity	3.020±0.008[1] L☉
Surface gravity (log g)	4.12[3] cgs
Temperature	5,818+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
Age	7.5+0.7; −0.8[2] Gyr
Other designations
	CD−49°13955, FK5 6008, HD 215456, HIP 112414, SAO 231285, NLTT 54757, 2MASS J22460804-4858437[6]
Database references
SIMBAD	data

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]

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]

Planetary system

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 on exoplanet.eu 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 M_J	0.652	191.99	0.15	—	—
c	>0.246 M_J	3.394	2277	0.19	—	—

References

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.
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.
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, S2CID 119476992.
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.
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, S2CID 119107228.
"HD 215456". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-10.
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.
exoplanet.eu HD 215456 b
exoplanet.eu HD 215456 c

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[GaiaDR2-1] 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.

[Anderson2012-2] 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.

[Gray2006-3] 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, S2CID 119476992.

[Pinheiro2014-4] 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.

[soto2018-5] 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, S2CID 119107228.

[SIMBAD-6] "HD 215456". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-10.

[Mayor2011-7] 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] xoplanet.eu HD 215456 b

[9] xoplanet.eu HD 215456 c