| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Tucana |
| Right ascension | 22h 18m 30.1s |
| Declination | −60° 15' 35" |
| Apparent magnitude (V) | +2.87 |
| Distance | 199 ± 7 ly (61 ± 2 pc) |
| Spectral type | K3III |
| Other designations | |
Alpha Tucanae (α Tuc, α Tucanae) is a binary star in the constellation Tucana.
The primary component, Alpha Tucanae A, is an orange K-type giant with an apparent magnitude of +2.87. It is approximately 199 light years from Earth. The system is an astrometric binary, which means that the companion star has not been directly observed, but its presence has been inferred from measuring changes in the proper motion of the primary. The orbital period of the binary system is 11.5 years.
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