鳖六(acrA),即南冕座a,是南冕座的一颗恒星。其天文特有名称是Alphekka Meridiana 或Alfecca Meridiana 鳖六的视星等为4.08,其B1950.0坐标为赤经19h 06min 04. 3580136s, 3759'03.394892.