| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Fornax[1] |
| Right ascension | 03h 20m 02.94286s[2] |
| Declination | −28° 47′ 01.7905″[2] |
| Apparent magnitude (V) | 8.48[3] |
| Characteristics | |
| Spectral type | K0V[3] |
| B−V color index | 0.82[3] |
| Astrometry | |
| Radial velocity (Rv) | 40.27±0.12[2] km/s |
| Proper motion (μ) | RA: 348.869±0.015 mas/yr[2] Dec.: −66.614±0.019 mas/yr[2] |
| Parallax (π) | 27.8123 ± 0.0239 mas[2] |
| Distance | 117.3 ± 0.1 ly (35.96 ± 0.03 pc) |
| Absolute magnitude (MV) | 5.70[3] |
| Details[3] | |
| Mass | 0.7 M☉ |
| Luminosity | 0.49±0.04 L☉ |
| Surface gravity (log g) | 4.37±0.05 cgs |
| Temperature | 5256±29 K |
| Metallicity [Fe/H] | −0.11±0.02 dex |
| Rotation | 46.8±4.4 d |
| Rotational velocity (v sin i) | 1.1 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 20781 is a star which is part of a wide binary system with HD 20782. The companion star has a very large angular separation of 252 arcsec, corresponding to 9080 AU at the distance of HD 20782.[5] Both stars possess their own planetary systems in S type orbits, with a total of five known planets around both stars.[3][6] This is the first known example of planets being found orbiting both components of a wide binary system.[5][7] HD 20781 has no noticeable starspot activity.[3]
Roman1987 was invoked but never defined (see the help page).GaiaDR3 was invoked but never defined (see the help page).Udry2017 was invoked but never defined (see the help page).SIMBAD was invoked but never defined (see the help page).Desidera was invoked but never defined (see the help page).NASAExoplanetArchive was invoked but never defined (see the help page).Mayor2011 was invoked but never defined (see the help page).