Star lore
Mimosa
Direct answer
Mimosa is Beta Crucis, a hot blue-white multiple star marking the eastern arm of Crux.
Mimosa is the bright eastern arm star of the Southern Cross.
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At a glance
- Found in
- Constellations & Star Lore
- Related
- Pollux, Castor, Acrux, Hadar
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The story behind Mimosa
The name Mimosa entered modern navigation usage and is now approved by the IAU.
A one-minute story
The Road of the Sun
Where the twelve signs came from, and why they carry the names they do.
Why Mimosa matters
Mimosa’s color and position help distinguish true Crux from nearby false-cross patterns.
How to read Mimosa
Place Mimosa opposite Delta Crucis across the Cross, with Acrux below and Gacrux above.
Mimosa in practice: an example
Photometry shows that Mimosa varies slightly as a Beta Cephei pulsating star.
Where readings of Mimosa go wrong
The variability is subtle and does not account for obvious naked-eye flickering near the horizon.
Sources and editorial method
Research references used for this entry include:
- IAU Division C Working Group on Star Names - Official IAU working group responsible for standardizing star names used in international astronomy.
- CDS SIMBAD Astronomical Database - Professional astronomical database for stellar identifiers, positions, classifications, and bibliography.
- Source
- The Great Almanac Dictionary
- Category
- Constellations & Star Lore
- Last updated
- 2026-09-26
Set the eastern arm of Crux
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Common questions
What is Mimosa?
Mimosa is Beta Crucis, a hot blue-white multiple star marking the eastern arm of Crux.
What does the name Mimosa mean?
The name Mimosa entered modern navigation usage and is now approved by the IAU.
What do people get wrong about Mimosa?
The variability is subtle and does not account for obvious naked-eye flickering near the horizon.
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