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 | |
Database references | |
SIMBAD | data |
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 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]
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]
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 |
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 | |
Database references | |
SIMBAD | data |
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 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]
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]
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 |