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Gas giants transiting bright nearby stars are stepping stones for ourunderstanding of planetary system formation and evolution mechanisms. Thispaper presents a particularly interesting new specimen of this kind ofexoplanet discovered by the WASP-South transit survey, WASP-193b. This planetcompletes an orbit around its Vmag = 12.2 F9 main-sequence host star every 6.25d. Our analyses found that WASP-193b has a mass of Mp = 0.139 +/- 0.029 M_Jupand a radius of Rp = 1.464 +/- 0.058 R_ Jup, translating into an extremely lowdensity of rhop = 0.059 +\- 0.014 g/cm^3. The planet was confirmedphotometrically by the 0.6-m TRAPPIST-South, the 1.0-m SPECULOOS-Southtelescopes, and the TESS mission, and spectroscopically by the ESO-3.6-m/HARPSand Euler-1.2-m/CORALIE spectrographs. The combination of its large transitdepth (dF~1.4 %), its extremely-low density, its high-equilibrium temperature(Teq = 1254 +/- 31 K), and the infrared brightness of its host star (magnitudeKmag=10.7) makes WASP-193b an exquisite target for characterization bytransmission spectroscopy (transmission spectroscopy metric: TSM ~ 600). Onesingle JWST transit observation would yield detailed insights into itsatmospheric properties and planetary mass, within ~0.1 dex and ~1% (vs ~20%currently with radial velocity data) respectively.

WASP-193b: An extremely low-density super-Neptune