WASP-50
WASP-50 is a G-type main-sequence star about 610 light-years away. The star is older than Sun and slightly depleted in heavy elements compared to Sun, and have a close to average starspot activity.[4] Despite of advanced age, the star is rotating rapidly, being spun up by the tides raised by giant planet on close orbit.[3]
| 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[1] mas |
| 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 |
The star was named Chaophraya in December 2019 by the Thai amateur astronomers.[5]
Planetary system
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 | 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 |
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References
- WASP-50 -- Star
- PRECISE PHOTOMETRIC TRANSIT FOLLOW-UP OBSERVATIONS OF FIVE CLOSE-IN EXOPLANETS : UPDATE ON THEIR PHYSICAL PROPERTIES, 2019, arXiv:1905.11258
- A comparison of gyrochronological and isochronal age estimates for transiting exoplanet host stars, 2015, arXiv:1503.09111
- WASP-50 b: a hot Jupiter transiting a moderately active solar-type star, 2011, arXiv:1108.2641
- "Two celestial objects named Chao Phraya and Maeping". nationthailand.com. Retrieved 2020-07-30.
- An extremely high photometric precision in ground-based observations of two transits in the WASP-50 planetary system, 2012, arXiv:1212.0686
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