HD 216770

HD 216770 is an 8th-magnitude star located approximately 124 light-years away in the constellation of Piscis Austrinus. It is an orange dwarf (spectral type K0 V),[2] and is somewhat dimmer and cooler than our Sun.

HD 216770
Observation data
Epoch J2000      Equinox J2000
Constellation Piscis Austrinus
Right ascension  22h 55m 53.7082s[1]
Declination –26° 39′ 31.548″[1]
Apparent magnitude (V) 8.11[2]
Characteristics
Spectral type K0V[2]
B−V color index 0.821[2]
Astrometry
Radial velocity (Rv)31.141 ± 0.0004[3] km/s
Proper motion (μ) RA: 226.442[1] mas/yr
Dec.: −177.741[1] mas/yr
Parallax (π)27.2472 ± 0.0725[1] mas
Distance119.7 ± 0.3 ly
(36.70 ± 0.10 pc)
Absolute magnitude (MV)5.22[2]
Details
Mass0.74 ± 0.07[4] M☉
Radius0.93 ± 0.02[4] R☉
Luminosity0.79[2] L☉
Surface gravity (log g)4.37 ± 0.04[4] cgs
Temperature5399 ± 18[4] K
Metallicity [Fe/H]0.27[4] dex
Rotation35.6 d[2]
Rotational velocity (v sin i)1.4[2] km/s
Age3.1[2] Gyr
Other designations
CD−27°16109, GC 31973, HIP 113238, SAO 191502, LTT 9276, NLTT 55283[5]
Database references
SIMBADdata

In 2003 a planet was announced orbiting it by the Geneva Extrasolar Planet Search team.[2]

The HD 216770 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >0.65 MJ 0.46 118.45 ± 0.55 0.37 ± 0.06 — —
c (unconfirmed) >0.1886 MJ 0.102 12.456 0.3887 — —

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.
  2. Mayor, M.; et al. (2004). "The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE". Astronomy and Astrophysics. 415 (1): 391–402. arXiv:astro-ph/0310316. Bibcode:2004A&A...415..391M. doi:10.1051/0004-6361:20034250. S2CID 5233877.
  3. Soubiran, C.; Jasniewicz, G.; Chemin, L.; Zurbach, C.; Brouillet, N.; Panuzzo, P.; Sartoretti, P.; Katz, D.; Le Campion, J. -F.; Marchal, O.; Hestroffer, D.; Thévenin, F.; Crifo, F.; Udry, S.; Cropper, M.; Seabroke, G.; Viala, Y.; Benson, K.; Blomme, R.; Jean-Antoine, A.; Huckle, H.; Smith, M.; Baker, S. G.; Damerdji, Y.; Dolding, C.; Frémat, Y.; Gosset, E.; Guerrier, A.; Guy, L. P.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. arXiv:1804.09370. Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795. S2CID 52952408.
  4. Stassun, Keivan G.; Collins, Karen A.; Gaudi, B. Scott (2017). "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes". The Astronomical Journal. 153 (3): 136. arXiv:1609.04389. Bibcode:2017AJ....153..136S. doi:10.3847/1538-3881/aa5df3. S2CID 119219062.
  5. "HD 216770". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-06-25.


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