DS Tucanae
DS Tucanae (HD 222259) is a binary star system 144 light years away in the constellation of Tucana. It has an apparent visual magnitude of 8.5, and is a RS Canum Venaticorum variable. The system is notable for being young as a member of the 45 Myr old Tucana-Horologium moving group and for the primary star hosting the confirmed exoplanet DS Tucanae Ab, discovered by THYME, using TESS.
DS Tucanae imaged with the NTT. DS Tucanae A is on the right and DS Tucanae B is on the left. | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Tucana |
| DS Tucanae A | |
| Right ascension | 23h 39m 39.48081s |
| Declination | −69° 11′ 44.7077″ |
| Apparent magnitude (V) | 8.47 |
| DS Tucanae B | |
| Right ascension | 23h 39m 39.26965s |
| Declination | −69° 11′ 39.4936″ |
| Apparent magnitude (V) | 9.84 |
| Characteristics | |
| Spectral type | G6V+K3V |
| Variable type | RS CVn |
| Astrometry | |
| A | |
| Radial velocity (Rv) | 7.20 km/s |
| Proper motion (μ) | RA: 79.529 mas/yr Dec.: −67.551 mas/yr |
| Parallax (π) | 22.6367 ± 0.0150 mas |
| Distance | 144.08 ± 0.10 ly (44.18 ± 0.03 pc) |
| B | |
| Radial velocity (Rv) | 5.32 km/s |
| Proper motion (μ) | RA: 78.133 mas/yr Dec.: −65.845 mas/yr |
| Parallax (π) | 22.6524 ± 0.0125 mas |
| Distance | 143.98 ± 0.08 ly (44.15 ± 0.02 pc) |
| Details | |
| DS Tucanae A | |
| Mass | 1.01±0.06 M☉ |
| Radius | 0.964±0.029 R☉ |
| Luminosity | 0.725±0.013 L☉ |
| Temperature | 5,428±80 K |
| Rotational velocity (v sin i) | 27.75+1.73 −1.54 km/s |
| Age | 45±4 Myr |
| DS Tucanae B | |
| Mass | 0.84±0.06 M☉ |
| Radius | 0.864±0.036 R☉ |
| Luminosity | 0.327±0.010 L☉ |
| Temperature | 4,700±90 K |
| Age | 45±4 Myr |
| Other designations | |
| Database references | |
| SIMBAD | AB |
| A | |
| B | |
| Ab | |
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