HD 82943
HD 82943 (164 G. Hydrae) is a star with a pair of orbiting exoplanets in the equatorial constellation of Hydra. It has an apparent visual magnitude of 6.54, which is near the lower limit of visibility to the naked eye. Based on parallax measurements, the distance to this system is 90.3 light years. It is drifting further away with a heliocentric radial velocity of 8.1 km/s. The star shows a high proper motion, traversing the celestial sphere at an angular rate of 0.194 arcsec yr−1.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 34m 50.735s |
| Declination | −12° 07′ 46.37″ |
| Apparent magnitude (V) | 6.54 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | F9 V Fe+0.5 |
| B−V color index | 0.623±0.001 |
| Astrometry | |
| Radial velocity (Rv) | 8.102±0.0003 km/s |
| Proper motion (μ) | RA: +1.440 mas/yr Dec.: −174.330 mas/yr |
| Parallax (π) | 36.1158 ± 0.0264 mas |
| Distance | 90.31 ± 0.07 ly (27.69 ± 0.02 pc) |
| Absolute magnitude (MV) | 4.35 |
| Details | |
| Mass | 1.14±0.01 M☉ |
| Radius | 1.17±0.02 R☉ |
| Luminosity | 1.54±0.02 L☉ |
| Surface gravity (log g) | 4.35±0.01 cgs |
| Temperature | 5,944±18 K |
| Metallicity [Fe/H] | 0.265±0.008 dex |
| Rotation | 18.0 d |
| Rotational velocity (v sin i) | 1.35±0.5 km/s |
| Age | 3.1±0.4 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The spectrum of HD 82943 presents as an F-type main-sequence star with a stellar classification of F9 V Fe+0.5. The suffix notation indicates a mild strengthening of iron lines relative to a typical star of its type. Nonetheless, it is considered a metal-rich star, having a higher abundance of many elements with masses greater than helium as compared to the Sun. This star is around 3 billion years old and is spinning with a rotation period of 18 days. It is 14% more massive and has a 17% larger radius than the Sun. The star is radiating 154% of the luminosity of the Sun from its photosphere at an effective temperature of 5,944 K.