HD_82943
HD 82943
Star in the constellation Hydra
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,[1] 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.[2] It is drifting further away with a heliocentric radial velocity of 8.1 km/s.[5] The star shows a high proper motion, traversing the celestial sphere at an angular rate of 0.194 arcsec yr−1.[10]
The spectrum of HD 82943 presents as an F-type main-sequence star[3] with a stellar classification of F9 V Fe+0.5.[4] 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,[11] having a higher abundance of many elements with masses greater than helium as compared to the Sun. This star is around 3[6] billion years old and is spinning with a rotation period of 18 days.[7] 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.[6]