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]
| 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 | |
| Database references | |
| SIMBAD | data |
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
editHD 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.
| 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
edit- ^ a b c d e f g h i j k l 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.
- ^ a b c d e f g h i 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.
- ^ a b c 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.
- ^ a b 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, hdl:10316/80294.
- ^ a b 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