The extreme closeness of WASP-103b to its host star causes it to be tidally stretched into an ellipsoid with its longest axis oriented towards its host star. Assuming Rᴊᴜᴘ denotes the equatorial radius of Jupiter (i.e. 71,492 km); the dimensions of WASP-103b are 1.721 ± 0.075 Rᴊᴜᴘ at the substellar point, 1.710 ± 0.072 Rᴊᴜᴘ at the antistellar point, 1.537 ± 0.043 Rᴊᴜᴘ at its poles, and 1.571 ± 0.047 Rᴊᴜᴘ at its sides. WASP-103b is significantly distorted from a spherical shape, with its longest axis ~10 percent longer than its shortest axis.
Southworth et al. (2014), “High-precision photometry by telescope defocussing. VII. The ultra-short period planet WASP-103”, arXiv:1411.2767 [astro-ph.EP]