| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus[1] |
| Right ascension | 00h 20m 38.53504s[2] |
| Declination | −23° 56′ 08.6028″[2] |
| Apparent magnitude (V) | 10.779[3] |
| Characteristics | |
| Spectral type | F9V[4] |
| Astrometry | |
| Radial velocity (Rv) | 1.26±0.85[2] km/s |
| Proper motion (μ) | RA: 1.352mas/yr[2] Dec.: -14.739mas/yr[2] |
| Parallax (π) | 3.4699±0.7095 mas[2] |
| Distance | approx. 900 ly (approx. 290 pc) |
| Details[5] | |
| Mass | 1.200±0.041 M☉ |
| Radius | 1.392±0.044 R☉ |
| Temperature | 5940±100 K |
| Metallicity[Fe/H] | −0.008±0.060 dex |
| Rotational velocity (v sin i) | 4.75±0.51 km/s |
| Age | 7.0+2.0 −1.0 Gyr |
| Other designations | |
| CD−24 102,TOI-194,TIC 211438925,WASP-20,TYC 6413-439-1,GSC 06413-00439,2MASS J00203853-2356086[3] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
WASP-20, also known asCD-24 102, is abinary star[4] system in the equatorial constellationCetus, located at a distance of about 940light-years (290parsecs) from the Sun. The primary star is anF-type main sequence star and hosts one confirmedexoplanet, WASP-20b.[6]
WASP-20 is a star of spectral type F9, aged7+2
−1 billion years. Its mass is 1.200 ± 0.041 solar masses for a radius of 1.392 ± 0.044 solar radii, or a density of 0.630 ± 0.046 grams per cubic centimeter.[7]
WASP-20b is atransitinghot Jupiter discovered in 2014.[7] WASP-20b orbits WASP-20 in less than five Earth days very close to its star (0.06AU) in a circular (near-zero eccentricity) orbit. The orbit is inclined by 85.56 ± 0.22° relative to the plane of the sky and is thus edge-on, as necessary for a transit to be observed.[5]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.311+0.019 −0.018 MJ | 0.05999+0.00069 −0.00068 | 4.8996284(33) | <0.039 | 85.56±0.22° | 1.462±0.059 RJ |
