DS Tucanae
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 | |
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Constellation | Tucana |
DS Tucanae A | |
Right ascension | 23h 39m 39.48096s[1] |
Declination | −69° 11′ 44.7093″[1] |
Apparent magnitude (V) | 8.47[2] |
DS Tucanae B | |
Right ascension | 23h 39m 39.26995s[1] |
Declination | –69° 11′ 39.4950″[1] |
Apparent magnitude (V) | 9.84[3] |
Characteristics | |
Spectral type | G6V+K3V[3] |
Variable type | RS CVn[4] |
Astrometry | |
A | |
Radial velocity (Rv) | 7.20[5] km/s |
Proper motion (μ) | RA: 79.464[5] mas/yr Dec.: -67.440[5] mas/yr |
Parallax (π) | 22.6663 ± 0.0354[5] mas |
Distance | 143.9 ± 0.2 ly (44.12 ± 0.07 pc) |
B | |
Radial velocity (Rv) | 6.1[6] km/s |
Proper motion (μ) | RA: 78.022[5] mas/yr Dec.: -65.746[6] mas/yr |
Parallax (π) | 22.6504 ± 0.0297[6] mas |
Distance | 144.0 ± 0.2 ly (44.15 ± 0.06 pc) |
Details | |
DS Tucanae A | |
Mass | 1.01±0.06[7] M☉ |
Radius | 0.964±0.029[7] R☉ |
Luminosity | 0.725±0.013[7] L☉ |
Temperature | 5428±80[7] K |
Rotational velocity (v sin i) | 27.75+1.73 −1.54[8] km/s |
Age | 45±4[7] Myr |
DS Tucanae B | |
Mass | 0.84±0.06[7] M☉ |
Radius | 0.864±0.036[7] R☉ |
Luminosity | 0.327±0.010[7] L☉ |
Temperature | 4700±90[7] K |
Age | 45±4[7] Myr |
Other designations | |
Database references | |
SIMBAD | AB |
DS Tucanae (HD 222259) is a binary star system in the constellation of Tucana. It has an apparent visual magnitude of 8.5,[7] and is a RS Canum Venaticorum variable.[4] The system is notable for being young as a member of the 45 Myr old Tucana-Horologium moving group[9] and for the primary star hosting the confirmed exoplanet , discovered by TESS.[10][7][11][12]
Stellar System[]
DS Tucanae is a visual binary.[3] The binary consists of a G6V primary and a K3V secondary separated by 5".[13] Based on radial velocity measurements it was suggested that the secondary itself is a binary, but later studies could not find evidence for this claim.[7]
Physical properties[]
High levels of magnetic activity, a strong 6708Å lithium line, and the position on the color-magnitude diagram, slightly above the main sequence, strongly support a young age of the system.[11]
Planetary System[]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
<14.4[8] M |