| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 02h 54m 45.1342s[1] |
| Declination | −10° 53′ 53.025″[1] |
| Apparent magnitude (V) | 11.44 |
| Characteristics | |
| Spectral type | G9V |
| Astrometry | |
| Radial velocity (Rv) | 25.24 km/s |
| Proper motion (μ) | RA: 3.383(20) mas/yr[1] Dec.: 8.913(17) mas/yr[1] |
| Parallax (π) | 5.4865±0.0174 mas[1] |
| Distance | 594 ± 2 ly (182.3 ± 0.6 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 594 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.[5] 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.[6]
- ^ a b c d Cite error: The named reference
Gaia DR3was invoked but never defined (see the help page). - ^ Chakrabarty, Aritra; Sengupta, Sujan (2019), "Precise Photometric Transit Follow-up Observations of Five Close-in Exoplanets: Update on Their Physical Properties", The Astronomical Journal, 158 (1): 39, arXiv:1905.11258, Bibcode:2019AJ....158...39C, doi:10.3847/1538-3881/ab24dd, S2CID 166227769
- ^ a b Maxted, P. F. L.; Serenelli, A. M.; Southworth, J. (2015), "A comparison of gyrochronological and isochronal age estimates for transiting exoplanet host stars", Astronomy & Astrophysics, 577: A90, arXiv:1503.09111, Bibcode:2015A&A...577A..90M, doi:10.1051/0004-6361/201525774, S2CID 53324330
- ^ Cite error: The named reference
simbadwas invoked but never defined (see the help page). - ^ Cite error: The named reference
Gillion2011was invoked but never defined (see the help page). - ^ "Two celestial objects named Chao Phraya and Maeping". nationthailand.com. 19 December 2019. Retrieved 2020-07-30.