Mimosa itself is clearly above the cutoff of 8 to 10 solar masses, beyond which stars explode as supernovae. It has perhaps only six or so million years left to go.
Mimosa (stars.astro.illinois.edu)MIMOSA (Beta Crucis). Few are the first magnitude stars, as their apparent brightness requires either great luminosity, closeness, or both. Mimosa satisfies the first requirement.