is ▁is ▁A 2   IV , ▁with ▁the ▁lum inos ity ▁class ▁of ▁' IV ' ▁indicating ▁that , ▁after ▁ 4 1 0   mill ion ▁years ▁on ▁the ▁main ▁sequence , ▁this ▁star ▁is ▁in ▁the ▁process ▁of ▁evol ving ▁into ▁a ▁giant ▁star ▁as ▁the ▁supply ▁of ▁hydro gen ▁at ▁its ▁core ▁becomes ▁exha usted . ▁Comp ared ▁to ▁the ▁Sun ▁it ▁has ▁ 2 4 0 % ▁of ▁the ▁mass ▁and ▁ 2 3 0 % ▁of ▁the ▁Sun ' s ▁radius , ▁but ▁is ▁radi ating ▁ 3 7 ▁times ▁as ▁much ▁lum inos ity . ▁This ▁energy ▁is ▁being ▁em itted ▁from ▁the ▁star ' s ▁outer ▁atmosphere ▁at ▁an ▁effective ▁temperature ▁of ▁ 9 , 2 8 0   K , ▁giving ▁it ▁the ▁characteristic ▁white - hot ▁g low ▁of ▁an ▁A - type ▁star . ▁ ▁N omen cl ature ▁ λ   U rs ae ▁Major is ▁( Lat in ised ▁to ▁L ambda ▁Urs ae ▁Major is ) ▁is ▁the ▁star ' s ▁Bayer ▁design ation . ▁ ▁It ▁bore ▁the ▁traditional ▁names ▁T ania ▁( shared ▁with ▁Mu ▁Urs ae ▁Major is ) ▁and ▁T ania ▁B ore alis . ▁T ania ▁comes ▁from ▁the ▁Arab ic ▁phrase ▁▁ ▁' the ▁Second ▁Spring ▁( of ▁the ▁Gaz elle ) '. ▁and ▁B ore alis ▁( origin ally ▁bore alis ) ▁is ▁Latin ▁for ▁' the ▁north ▁side '. ▁In ▁ 2 0 1 6 , ▁the ▁International ▁Astronom ical ▁Union