DS Tucanae

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DS Tucanae
DS Tuc A(right)B(left) H+OPEN.png
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 39.48096s[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
Distance143.9 ± 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
Distance144.0 ± 0.2 ly
(44.15 ± 0.06 pc)
Details
DS Tucanae A
Mass1.01±0.06[7] M
Radius0.964±0.029[7] R
Luminosity0.725±0.013[7] L
Temperature5428±80[7] K
Rotational velocity (v sin i)27.75+1.73
−1.54
[8] km/s
Age45±4[7] Myr
DS Tucanae B
Mass0.84±0.06[7] M
Radius0.864±0.036[7] R
Luminosity0.327±0.010[7] L
Temperature4700±90[7] K
Age45±4[7] Myr
Other designations
DS Tuc, HD 222259, CCDM J23397-6912AB, CD-69°2106, HIP 116748, WDS J23397-6912AB, TIC 410214986, TOI 200
Database references
SIMBADAB

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[]

The DS Tuc A planetary system[7][11]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
<14.4[8] M
WIKI