β Cru. Magnitude 1.25, blue-white. A first-magnitude star, among the brightest few dozen visible.
Astronomers call it β Cru — the Bayer designation, which reads as a Greek letter ranking its brightness within its constellation. Mimosa is the name people actually use.
Mimosa shines at magnitude 1.25, making it a first-magnitude star, among the brightest few dozen visible. Its B−V colour index of -0.23 makes it blue-white to the eye, corresponding to a surface temperature of over 10,000 K.
It sits at right ascension 12.80 hours and declination -59.7°. It lies south of the celestial equator and sits low for northern observers, better the further south you go.
SkyRef shows exactly where Mimosa is from your location right now — altitude, compass direction, and rise and set times.