83_Cancri
83 Cancri
Star in the constellation Cancer
83 Cancri is an astrometric binary[6][7] star system in the northern constellation of Cancer, positioned near the constellation border with Leo. It is a challenge to view with the naked eye, having an apparent visual magnitude of 6.61.[2] Despite having a Flamsteed designation, the system was too faint to be included in the Bright Star Catalogue.[8] It is located at a distance of 133 light years from the Sun, based on parallax,[1] but is drifting closer with a radial velocity of −15 km/s.[2] 83 Cancri has a relatively high proper motion, traversing the celestial sphere at an angular rate of 0.185″ per annum.[9]
The pair have an orbital period of around 32 days and an eccentricity of about 0.6.[3] The visible member of this system, designated component A, is an F-type main-sequence star with a stellar classification of F4V.[2] Its atmosphere is enhanced with s-process elements, particularly strontium and yttrium, which is attributed to mass transfer from the companion while the latter was on the asymptotic giant branch.[10] The primary is 3.1[4] billion years old with 1.1[4] times the mass of the Sun and 1.5[1] times the Sun's radius. It is radiating 3.1[1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,218 K.[1] The unseen secondary companion is most likely a high mass white dwarf, having around 1.3 times the Sun's mass.[3]