The second brightest of the stars of Crux, Mimosa (often also called Becrux) forms the eastern arm of the Southern Cross. Mimosa is rapidly pulsating variable of the Beta Cephei type, whose internal structure causes shifts in its brightness to recur several times a day.
Mimosa or Beta Crucis, also commonly called Becrux, the distinct blue colour of an extremely hot star. To the southeast of Mimosa (to the lower left in this image) is the sparkling open cluster known as the Jewel Box or Kappa Crucis Cluster, Caldwell 94. Imagery provided by Aladin sky atlas
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