mas ▁as ▁seen ▁from ▁Earth ' s ▁orbit , ▁it ▁is ▁located ▁ 5 1 . 5   light ▁years ▁from ▁the ▁Sun . ▁The ▁system ▁is ▁moving ▁closer ▁to ▁the ▁Sun ▁with ▁a ▁radial ▁velocity ▁of ▁− 2 1 . 5   km / s . ▁ ▁Spect ro graph ic ▁images ▁taken ▁at ▁the ▁Cape ▁Observ atory ▁between ▁ 1 9 2 1 ▁and ▁ 1 9 2 3 ▁showed ▁this ▁star ▁has ▁a ▁variable ▁radial ▁velocity , ▁which ▁indicated ▁this ▁is ▁a ▁single - lined ▁spect ro scop ic ▁binary ▁star ▁system . ▁The ▁pair ▁have ▁an ▁orb ital ▁period ▁of ▁ 9 . 9 4   days ▁and ▁an ▁ecc ent ric ity ▁of ▁about ▁ 0 . 2 . ▁ ▁The ▁primary ▁component ▁has ▁received ▁a ▁number ▁of ▁different ▁stell ar ▁class ifications . ▁For ▁example , ▁Jas che k ▁et ▁al . ▁( 1 9 6 4 ) ▁lists ▁F 0 V , ▁F 2 III , ▁F 4 III , ▁and ▁F 4 IV , ▁thus ▁r anging ▁in ▁evolution ary ▁state ▁from ▁an ▁ordinary ▁F - type ▁main - sequence ▁star ▁to ▁a ▁giant ▁star . ▁More ▁recently , ▁Hou k ▁( 1 9 8 2 ) ▁listed ▁a ▁class ▁of ▁F 3   V , ▁matching ▁an ▁ordinary ▁main - sequence ▁star ▁that ▁is ▁generating ▁energy ▁through ▁hydro gen ▁fusion ▁at ▁its ▁core . ▁The ▁N St ars ▁project ▁gives ▁it ▁a ▁classification ▁of ▁F 2   V . ▁ ▁References ▁ ▁Category :