WASP-20
Star in the constellation Cetus
From Wikipedia, the free encyclopedia
WASP-20, also known as CD-24 102, is a binary star[5] system in the equatorial constellation Cetus, located at a distance of about 940 light-years (290 parsecs) from the Sun. The primary star is an F-type main sequence star and hosts one confirmed exoplanet, WASP-20b.[6]
| 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 | |
| Evolutionary stage | main sequence[4] |
| Spectral type | F9V[5] |
| Astrometry | |
| Radial velocity (Rv) | 1.26±0.85[2] km/s |
| Proper motion (μ) | RA: +1.352 mas/yr[2] Dec.: −14.739 mas/yr[2] |
| Parallax (π) | 3.4699±0.7095 mas[2] |
| Distance | approx. 900 ly (approx. 290 pc) |
| Details | |
| Mass | 1.09[4] M☉ |
| Radius | 1.14[4] R☉ |
| Surface gravity (log g) | 4.36[4] cgs |
| Temperature | 5,940±100[4] K |
| Metallicity [Fe/H] | −0.008±0.060[4] dex |
| Rotational velocity (v sin i) | 4.75±0.51[4] km/s |
| Age | 3.6[4] 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 |
Stellar properties
WASP-20 is a star of spectral type F9, aged 3.6 billion years. Its mass is 10.09+0.05
−0.02 solar masses for a radius of 1.14+0.08
−0.01 solar radii, or a density of 0.73±0.17 grams per cubic centimeter.[4]
Planetary system
WASP-20b is a transiting hot Jupiter discovered in 2014.[7] WASP-20b orbits WASP-20 in less than five Earth days very close to its star (0.06 AU) 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.[4]
| 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 |