Beta Tucanae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Tucana |
| β1 Tuc (β Tuc AB) | |
| Right ascension | 00h 31m 32.6709s |
| Declination | −62° 57′ 29.587″ |
| Apparent magnitude (V) | +4.37 |
| β2 Tuc (β Tuc CD) | |
| Right ascension | 00h 31m 33.4223s |
| Declination | −62° 57′ 56.134″ |
| Apparent magnitude (V) | +4.54 |
| Characteristics | |
| β1 Tuc | |
| Spectral type | B9V |
| β2 Tuc | |
| Spectral type | A2V + A7V |
| Astrometry | |
| β1 Tuc | |
| Parallax (π) | 23.2596±0.2471 mas |
| Distance | 140 ± 1 ly (43.0 ± 0.5 pc) |
| β2 Tuc | |
| Parallax (π) | 19.5923 ± 0.9674 mas |
| Distance | 166 ± 8 ly (51 ± 3 pc) |
| Details | |
| β Tuc A | |
| Mass | 3.84 M☉ |
| Radius | 2.73 R☉ |
| Luminosity | 39 L☉ |
| Surface gravity (log g) | 4.37 cgs |
| Temperature | 10,726 K |
| Rotational velocity (v sin i) | 170 km/s |
| β Tuc B | |
| Mass | 0.40 M☉ |
| β Tuc Ca | |
| Mass | 2.0 M☉ |
| Radius | 1.6 R☉ |
| Temperature | 9,200 K |
| β Tuc Cb | |
| Mass | 1.45 M☉ |
| Radius | 1.4 R☉ |
| Temperature | 7,000 K |
| β Tuc D | |
| Mass | 1.45 M☉ |
| Radius | 1.4 R☉ |
| Temperature | 7,000 K |
| Other designations | |
| β Tuc, CPD−63°50, GC 625, HR 126, CCDM 00316-6258 | |
| β1: HD 2884, HIP 2484, SAO 248201 | |
| β2: HD 2885, HIP 2487, SAO 248202 | |
| Database references | |
| β1 | |
| β2 | |
Beta Tucanae, Latinized from β Tucanae, is a group of six stars which appear to be at least loosely bound into a system in the constellation Tucana. Three of the stars are luminous and distinct enough to have been given their own Bayer designations, β1 Tucanae through β3 Tucanae. The system is approximately 140 light years from Earth.