We report the discovery and tomographic detection of WASP-174b , a planet with a near-grazing transit on a 4.23-d orbit around a V = 11.9 , F6V star with [ Fe/H ] = 0.09 \pm 0.09 .
The planet is in a moderately misaligned orbit with a sky-projected spin–orbit angle of \lambda = 31 ^ { \circ } \pm 1 ^ { \circ } .
This is in agreement with the known tendency for orbits around hotter stars to be misaligned .
Owing to the grazing transit the planet ’ s radius is uncertain , with a possible range of 0.8–1.8 R _ { Jup } .
The planet ’ s mass has an upper limit of 1.3 M _ { Jup } .
WASP-174 is the faintest hot-Jupiter system so far confirmed by tomographic means .