WASP-74 is a star in the constellation of Aquila, located approximately 487 light-years (149 parsecs) from the Sun.[1] At least one exoplanet is known to orbit the star.
Stellar characteristics
WASP-74 is a yellow-white main-sequence star of spectral type F9. Its apparent magnitude is 9.75, making it invisible to the naked eye. Based on spectroscopic analysis with the HARPS-N spectrograph and Bayesian modelling using PARSEC isochrones, the star has a mass of 1.236 ± 0.026 solar masses, a radius of 1.444 ± 0.044 solar radii, and an effective temperature of 5,883 ± 57 K. Its metallicity ([Fe/H]) is +0.38 ± 0.03, indicating it is notably more metal-rich than the Sun. The stellar models constrain the age of the star to 3.49 ± 0.65 billion years, and its projected rotational velocity is 5.85 ± 0.50 km/s.[3]
The star’s proper motion is 1.350 ± 0.082 mas/yr in right ascension and −64.604 ± 0.060 mas/yr in declination, with a radial velocity of −15.32 ± 0.27 km/s.[1]
Planetary system
In 2015, one exoplanet was announced orbiting WASP-74, designated WASP-74 b, discovered by the SuperWASP survey using the transit method.[2] It is a hot Jupiter with a mass of 0.72 Jupiter masses and a radius of 1.312 Jupiter radii, completing one orbit every 2.13775138 days at a distance of 0.0334 AU from its host star, with an equilibrium temperature of approximately 1,865 K. The planet’s orbit is circular and well-aligned with the stellar equator, with a measured sky-projected spin-orbit angle of 0.77 ± 0.99 degrees.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.72 MJ | 0.0334 | 2.13775138 | 0 | — | 1.312 RJ |
References
- ^ a b c d e f g h i j “WASP-74”. NASA Exoplanet Archive. Retrieved 2026-04-01.
- ^ a b Hellier, C.; et al. (2015). “Three WASP-South Transiting Exoplanets: WASP-74b, WASP-83b, and WASP-89b”. The Astronomical Journal. 150 (1): 18. arXiv:1410.6358. Bibcode:2015AJ….150…18H. doi:10.1088/0004-6256/150/1/18.
- ^ a b c d e f g h Luque, R.; et al. (2020). “Obliquity measurement and atmospheric characterisation of the WASP-74 planetary system”. Astronomy & Astrophysics. 642: A50. arXiv:2007.11851. Bibcode:2020A&A…642A..50L. doi:10.1051/0004-6361/202038703.
- ^ a b De Laverny, Patrick; Ligi, Roxanne; Crida, Aurélien; Recio-Blanco, Alejandra; Palicio, Pedro A. (2025). “The Gaia spectroscopic catalogue of exoplanets and host stars”. Astronomy and Astrophysics. 699: A100. arXiv:2505.22205. Bibcode:2025A&A…699A.100D. doi:10.1051/0004-6361/202554739.
