▁year ▁reaching ▁a ▁maximum ▁decl ination ▁of ▁, ▁at ▁right ▁asc ension ▁. ▁ ▁Binary ▁system ▁Th ub an ▁is ▁a ▁single - lined ▁spect ro scop ic ▁binary . ▁Only ▁the ▁primary ▁star ▁can ▁be ▁detected ▁in ▁the ▁spectrum . ▁The ▁radial ▁velocity ▁variations ▁of ▁the ▁primary ▁can ▁be ▁measured ▁and ▁the ▁pair ▁have ▁a ▁somewhat ▁ecc ent ric ▁orbit ▁of ▁ 5 1 . 4 ▁days . ▁M aking ▁some ▁assumptions ▁based ▁on ▁the ▁faint ness ▁of ▁the ▁secondary , ▁the ▁stars ▁are ▁likely ▁to ▁be ▁about ▁ 0 . 4 6 ▁astronom ical ▁units ▁apart ▁and ▁the ▁secondary ▁is ▁a ▁little ▁less ▁massive ▁than ▁the ▁primary . ▁The ▁secondary ▁is ▁likely ▁to ▁be ▁a ▁main ▁sequence ▁star ▁slightly ▁cool er ▁than ▁the ▁primary , ▁possibly ▁an ▁A 2 ▁spectral ▁class . ▁ ▁The ▁secondary ▁star ▁was ▁detected ▁in ▁high ▁spatial ▁resolution ▁observations ▁using ▁the ▁Navy ▁P rec ision ▁Opt ical ▁Inter fer ometer . ▁The ▁secondary ▁star ▁is ▁ 1 . 8 ▁magn itudes ▁( at ▁ 7 0 0 ▁n m ) ▁f ain ter ▁than ▁the ▁primary ▁star ▁and ▁was ▁detected ▁at ▁separ ations ▁r anging ▁from ▁ 6 . 2 ▁to ▁ 2 . 6 ▁mill i - arc seconds . ▁E cli ps es ▁were ▁detected ▁using ▁data ▁obtained ▁with ▁the ▁Trans iting ▁Ex op lan et ▁Survey ▁Sat ellite ▁( TE SS ). ▁The ▁presence ▁of ▁e cli ps es ▁places ▁Th ub an ▁into ▁the ▁class ▁of ▁bin aries ▁known ▁as ▁e cli ps