64_Eridani
64 Eridani
Single, yellow-white hued star in the constellation Eridanus
64 Eridani is a single,[12] yellow-white hued star in the constellation Eridanus having variable star designation S Eridani. It is faintly visible to the naked eye with an apparent visual magnitude of 4.77.[3] The annual parallax shift is measured at 12.01 mas, which equates to a distance of about 272 light years.[7] In addition to its proper motion, it is moving closer to the Sun with a radial velocity of around −9 km/s.[6]
This is an F-type main-sequence star with a stellar classification of F0 V.[4] It is catalogued a low amplitude Delta Scuti variable with a primary period of 0.273 days.[5] It was originally classified, tentatively, as an RR Lyrae variable of type 'c'.[13]
64 Eridani is spinning rapidly with a projected rotational velocity of 212 km/s.[10] This is giving the star an oblate shape with an equatorial bulge; its equatorial radius is 8% larger than its polar radius.[14] The star is an estimated 644 million years old with 1.5 times the mass of the Sun.[9] It is radiating 80[8] times the Sun's luminosity from its photosphere at an effective temperature of roughly 7,346 K.[9]