HD 216770
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| 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 mas[1] |
| Distance | 119.7 ± 0.3 ly (36.70 ± 0.10 pc) |
| Absolute magnitude (MV) | 5.22[2] |
| Details | |
| Mass | 0.74 ± 0.07[4] M☉ |
| Radius | 0.93 ± 0.02[4] R☉ |
| Luminosity | 0.79[2] L☉ |
| Surface gravity (log g) | 4.37 ± 0.04[4] cgs |
| Temperature | 5399 ± 18[4] K |
| Metallicity [Fe/H] | 0.27[4] dex |
| Rotation | 35.6 d[2] |
| Rotational velocity (v sin i) | 1.4[2] km/s |
| Age | 3.1[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 the Sun.
In 2003 a planet was announced orbiting it by the Geneva Extrasolar Planet Search team.[2]
| 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
- ^ a b c d e 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.
- ^ a b c d e f g h i j 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.
- ^ 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.
- ^ a b c d e 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.
- ^ "HD 216770". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-06-25.
External links
- "Notes for star HD 216770". The Extrasolar Planets Encyclopaedia.
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