WASP-20

WASP-20, also known as CD-24 102, is a binary star^[4] 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]

WASP-20

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: 1.352 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[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

Stellar properties

WASP-20 is a star of spectral type F9, aged 7+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]

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.^[5]

The WASP-20 planetary system^[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

See also

• Wide Angle Search for Planets
• Lists of planets