, ▁until ▁ 1 7 9 3 ▁B CE , ▁when ▁it ▁was ▁su pers eded ▁by ▁K appa ▁Dra con is . ▁It ▁was ▁closest ▁to ▁the ▁pole ▁in ▁ 2 8 3 0 ▁B CE , ▁when ▁it ▁was ▁less ▁than ▁ten ▁arc - min utes ▁away ▁from ▁the ▁pole . ▁It ▁remained ▁within ▁one ▁degree ▁of ▁cel est ial ▁north ▁for ▁nearly ▁ 2 0 0 ▁years ▁afterwards , ▁and ▁even ▁ 9 0 0 ▁years ▁after ▁its ▁closest ▁approach , ▁was ▁just ▁five ▁degrees ▁off ▁the ▁pole . ▁Th ub an ▁was ▁considered ▁the ▁pole ▁star ▁until ▁about ▁ 1 8 0 0 ▁B CE , ▁when ▁the ▁much ▁br ighter ▁B eta ▁Urs ae ▁Minor is ▁( K och ab ) ▁began ▁to ▁approach ▁the ▁pole ▁as ▁well . ▁ ▁Having ▁gradually ▁dr ift ed ▁away ▁from ▁the ▁pole ▁over ▁the ▁last ▁ 4 , 8 0 0 ▁years , ▁Th ub an ▁is ▁now ▁seen ▁in ▁the ▁night ▁sky ▁at ▁a ▁decl ination ▁of ▁ 6 4 ° ▁ 2 0 ' ▁ 4 5 . 6 ", ▁RA ▁ 1 4 h ▁ 0 4 m ▁ 3 3 . 5 8 s . ▁After ▁moving ▁nearly ▁ 4 7 ▁degrees ▁off ▁the ▁pole ▁by ▁ 1 0 0 0 0 ▁CE , ▁Th ub an ▁will ▁gradually ▁move ▁back ▁toward ▁the ▁north ▁cel est ial ▁pole . ▁In ▁ 2 0 3 4 6 ▁CE , ▁it ▁will ▁again ▁be ▁the ▁pole ▁star , ▁that