HD 143811
HD 143811 AB b (arrow) with Gemini in 2019. The star is behind the black disk of the coronagraph in the center. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lupus |
| Right ascension | 16h 03m 33.425s |
| Declination | −30° 08′ 13.38″ |
| Apparent magnitude (V) | +8.91±0.01 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | F5V |
| Astrometry | |
| Radial velocity (Rv) | +0.48±0.02 km/s |
| Proper motion (μ) | RA: −14.850 mas/yr Dec.: −24.984 mas/yr |
| Parallax (π) | 7.3065±0.0204 mas |
| Distance | 446 ± 1 ly (136.9 ± 0.4 pc) |
| Orbit | |
| Period (P) | 18.59098(7) days |
| Semi-major axis (a) | 0.1854+0.0014 −0.0024 au |
| Eccentricity (e) | 0.4935±0.0013 |
| Inclination (i) | 22.9+0.3 −0.2° |
| Periastron epoch (T) | 58230.438±0.006 MJD |
| Argument of periastron (ω) (secondary) | 335.91±0.18° |
| Argument of periastron (ω) (primary) | 155.91±0.18° |
| Semi-amplitude (K1) (primary) | 22.76±0.05 km/s |
| Semi-amplitude (K2) (secondary) | 25.71±0.06 km/s |
| Details | |
| A | |
| Mass | 1.30+0.03 −0.05 M☉ |
| Temperature | 6,751+207 −148 K |
| Metallicity [Fe/H] | −0.18±0.10 dex |
| Rotational velocity (v sin i) | 6.8±0.6 km/s |
| Age | 20.9+1.8 −1.7 Myr |
| B | |
| Mass | 1.15+0.03 −0.04 M☉ |
| Temperature | 6,349+122 −133 K |
| Metallicity [Fe/H] | −0.18±0.10 dex |
| Rotational velocity (v sin i) | 2.8±1.4 km/s |
| Age | 20.9+1.8 −1.7 Myr |
| Other designations | |
| CD−29°12217, HD 143811, HIP 78663, TYC 7330-289-1 | |
| Database references | |
| SIMBAD | data |
HD 143811 is a spectroscopic binary system in the constellation Lupus. Its apparent magnitude is 8.91, too faint to be visible with the naked eye. Based on parallax measurements from the Gaia spacecraft, it is located at a distance of 446 light-years (137 parsecs).
The system is a member of the Scorpius–Centaurus association, and has an estimated age of 21 million years. The two stellar components are a bit more massive and hotter than the Sun. They take 18.59 days to orbit each other, and have an unusually eccentric orbit for such a short orbital period. HD 143811 has a debris disk located at 8.5 astronomical units, with an estimated temperature of 140 K (−133 °C), and is orbited by one known exoplanet, at 63 au.