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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]

WASP-50
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]
Distance606 ± 6 ly
(186 ± 2 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[1]
Database references
SIMBADdata

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]


The WASP-50 planetary system[2][4][6]
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

References


  1. WASP-50 -- Star
  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: 39, arXiv:1905.11258, doi:10.3847/1538-3881/ab24dd, S2CID 166227769
  3. 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, doi:10.1051/0004-6361/201525774, S2CID 53324330
  4. 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.; Collier-Cameron, A.; Enoch, B.; Faedi, F.; Hellier, C.; Jehin, E.; Magain, P.; Montalban, J.; Pepe, F.; Pollacco, D.; Queloz, D.; Smalley, B.; Segransan, D.; Smith, A. M. S.; Southworth, J.; Udry, S.; West, R. G.; Wheatley, P. J. (2011), WASP-50 b: a hot Jupiter transiting a moderately active solar-type star, arXiv:1108.2641, doi:10.1051/0004-6361/201117198, S2CID 46639973
  5. "Two celestial objects named Chao Phraya and Maeping". nationthailand.com. 19 December 2019. Retrieved 2020-07-30.
  6. 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, arXiv:1212.0686, doi:10.1093/mnras/stt227, S2CID 118869498

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На других языках

- [en] WASP-50

[ru] WASP-50

WASP-50 — звезда в созвездии Эридана на расстоянии приблизительно 750 световых лет от нас. Вокруг звезды обращается, как минимум, одна планета.


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