HD 20868

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
Distance151 ± 10 ly
(46 ± 3 pc)
Details
Mass0.76 ± 0.02[3] M☉
Radius0.73 ± 0.01[3] R☉
Luminosity0.255 ± 0.002[3] L☉
Surface gravity (log g)4.59 ± 0.02[3] cgs
Temperature4811 ± 14[3] K
Metallicity [Fe/H]0.04 ± 0.1 dex
Age8.4 ± 3.7[3] Gyr
Other designations
HIP 15578, CD−34 1218, LTT 1589, 2MASS J03204266-3343484, PPM 278952
Database references
SIMBADdata
Exoplanet Archivedata
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]

The HD 20868 planetary system[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. 1 2 3 4 5 6 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752 Freely accessible. doi:10.1051/0004-6361:20078357.Vizier catalog entry
  2. 1 2 3 4 5 "SIMBAD query result: NLTT 10676 -- High proper-motion Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-06-10.
  3. 1 2 3 4 5 6 Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. Bibcode:2015A&A...575A..18B. arXiv:1411.4302 Freely accessible. doi:10.1051/0004-6361/201424951.
  4. 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. Bibcode:2009A&A...496..513M. arXiv:0810.4662 Freely accessible. doi:10.1051/0004-6361:200810941.

Coordinates: 03h 20m 42.694s, −33° 43′ 48.37″


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