Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Eridanus |
Right ascension | 02h 54m 45.1343s[1] |
Declination | −10° 53′ 53.0260″[1] |
Apparent magnitude (V) | 11.44 |
Characteristics | |
Spectral type | G9V |
Astrometry | |
Radial velocity (Rv) | 25.24 km/s |
Proper motion (μ) | RA: 3.281 mas/yr Dec.: 8.963 mas/yr |
Parallax (π) | 5.3816 ± 0.0540 mas[1] |
Distance | 606 ± 6 ly (186 ± 2 pc) |
Details[2][3] | |
Mass | 0.892+0.08 −0.074 M☉ |
Radius | 0.843±0.031 R☉ |
Surface gravity (log g) | 4.5±0.1 cgs |
Temperature | 5400±100 K |
Metallicity | −0.12±0.08 |
Rotation | 16.30 ± 0.50 d |
Rotational velocity (v sin i) | 2.6±0.5 km/s |
Age | 8.57±2.86 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
WASP-50 is a G-type main-sequence star about 610 light-years away. The star is older than the Sun and slightly depleted in heavy elements compared to the Sun, and has a close to average starspot activity.[4] Despite its advanced age, the star is rotating rapidly, being spun up by the tides raised by giant planet on close orbit.[3]
The star was named Chaophraya in December 2019 by the Thai amateur astronomers.[5]
In 2011 a transiting hot superjovian planet b (named Maeping in 2019[5]) was detected.[4] It has an equilibrium temperature of 1405±58 K.[2]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b / Maeping | 1.437±0.068 MJ | 0.0293±0.0013 | 1.955100±0.000005 | 0.01+0.02 −0.01 |
84.88±0.27° | 1.138±0.026 RJ |