Astronomy:WASP-50
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Short description: Star in the constellation Eridanus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
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]
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 / 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 |
References
- ↑ 1.0 1.1 1.2 1.3 WASP-50 -- Star
- ↑ 2.0 2.1 2.2 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, doi:10.3847/1538-3881/ab24dd, Bibcode: 2019AJ....158...39C
- ↑ 3.0 3.1 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, doi:10.1051/0004-6361/201525774, Bibcode: 2015A&A...577A..90M
- ↑ 4.0 4.1 4.2 Gillon, M.; Doyle, A. P.; Lendl, M.; Maxted, P. F. L.; Triaud, A. H. M. J.; Anderson, D. R.; Barros, S. C. C.; Bento, J. et al. (2011), "WASP-50 b: a hot Jupiter transiting a moderately active solar-type star", Astronomy & Astrophysics 533: A88, doi:10.1051/0004-6361/201117198, Bibcode: 2011A&A...533A..88G
- ↑ 5.0 5.1 "Two celestial objects named Chao Phraya and Maeping". 19 December 2019. https://www.nationthailand.com/edandtech/30379640.
- ↑ Tregloan-Reed, Jeremy; Southworth, John (2012), "An extremely high photometric precision in ground-based observations of two transits in the WASP-50 planetary system", Monthly Notices of the Royal Astronomical Society 431: 966–971, doi:10.1093/mnras/stt227
Coordinates: 
02h 54m 45.1343s, −10° 53′ 53.0260″
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