HD 20868
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Fornax |
| Right ascension | 03h 20m 42.69s[1] |
| Declination | −33° 43′ 48.4″[1] |
| Apparent magnitude (V) | 10.1 |
| Characteristics | |
| Spectral type | K3/K4IV[2] |
| Apparent magnitude (B) | ~12.1[2] |
| Apparent magnitude (J) | 8.138 ± 0.032[2] |
| Apparent magnitude (H) | 7.641 ± 0.031[2] |
| Apparent magnitude (K) | 7.543 ± 0.015[2] |
| Astrometry | |
| Proper motion (μ) | RA: 293.32 ± 0.99[1] mas/yr Dec.: 94.07 ± 1.13[1] mas/yr |
| Parallax (π) | 21.64 ± 1.38[1] mas |
| Distance | 151 ± 10 ly (46 ± 3 pc) |
| Details | |
| Mass | 0.76 ± 0.02[3] M☉ |
| Radius | 0.73 ± 0.01[3] R☉ |
| Luminosity | 0.255 ± 0.002[3] L☉ |
| Surface gravity (log g) | 4.59 ± 0.02[3] cgs |
| Temperature | 4811 ± 14[3] K |
| Metallicity [Fe/H] | 0.04 ± 0.1 dex |
| Age | 8.4 ± 3.7[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
HD 20868 is a low-mass K type star in the southern constellation Fornax. It is a 10th magnitude star at a distance of about 151 light years from Earth.[1]
Planetary system
In October 2008 a planet, HD 20868 b, was discovered. This object was detected using the radial velocity method by search programs conducted using the HARPS spectrograph.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥1.99 ± 0.05 MJ | 0.947 ± 0.012 | 380.85 ± 0.09 | 0.75 ± 0.002 | — | — |
See also
References
- 1 2 3 4 5 6 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752
. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry - 1 2 3 4 5 "SIMBAD query result: NLTT 10676 -- High proper-motion Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-06-10.
- 1 2 3 4 5 6 Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951.
- 1 2 Moutou, C.; et al. (2009). "The HARPS search for southern extra-solar planets XVII. Six long-period giant planets around BD -17 0063, HD 20868, HD 73267, HD 131664, HD 145377, HD 153950". Astronomy and Astrophysics. 496 (2): 513–519. arXiv:0810.4662. Bibcode:2009A&A...496..513M. doi:10.1051/0004-6361:200810941.
External links
- "HD 20868". Exoplanets.
Coordinates: 
03h 20m 42.694s, −33° 43′ 48.37″
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