WASP-50

WASP-50 / Chaophraya
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]
Distance594 ± 2 ly
(182.3 ± 0.6 pc)
Details[2][3]
Mass0.892+0.08
−0.074 M☉
Radius0.843±0.031 R☉
Surface gravity (log g)4.5±0.1 cgs
Temperature5400±100 K
Metallicity−0.12±0.08
Rotation16.30 ± 0.50 d
Rotational velocity (v sin i)2.6±0.5 km/s
Age8.57±2.86 Gyr
Other designations
Gaia DR2 5160557726183065984, TYC 5290-462-1, GSC 05290-00462, 2MASS J02544513-1053530[4]
Database references
SIMBADdata

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]

  1. ^ a b c d Cite error: The named reference Gaia DR3 was invoked but never defined (see the help page).
  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, arXiv:1905.11258, Bibcode:2019AJ....158...39C, doi:10.3847/1538-3881/ab24dd, S2CID 166227769
  3. ^ 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
  4. ^ Cite error: The named reference simbad was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Gillion2011 was invoked but never defined (see the help page).
  6. ^ "Two celestial objects named Chao Phraya and Maeping". nationthailand.com. 19 December 2019. Retrieved 2020-07-30.