K2-232 b: a transiting warm Saturn on an eccentric <italic>P</italic> = 11.2  d orbit around a <italic>V</italic> = 9.9 star.

We report the discovery of K2-232 b using photometric data of the <italic>Kepler K</italic>2 satellite coupled with ground-based spectroscopic observations. K2-232 b has a mass of <italic>M</italic>_{<italic>P</italic>} = 0.397 ± 0.037 M_{<italic>J</italic>}, a radius of <italic>R</italic>_{<italic>P</italic>} = 1.00 ± 0.020 R_{<italic>J</italic>}, and a moderately low equilibrium temperature of <italic>T</italic>_eq = 1030 ± 15 K due to its relatively large star–planet separation of <italic>a</italic> = 0.1036 au. K2-232 b orbits its bright (<italic>V</italic> = 9.9) late F-type host star in an eccentric orbit (<italic>e</italic> = 0.258 ± 0.025) every 11.2 d, and is one of only four well-characterized warm Jupiters having host stars brighter than <italic>V</italic> = 10. We estimate a heavy element content of 20 ± 7 M_⊕ for K2-232 b, which is consistent with standard models of giant planet formation. The bright host star of K2-232 b makes this system a well-suited target for detailed follow-up observations that will aid in the study of the atmospheres and orbital evolution of giant planets at moderate separations from their host stars. [ABSTRACT FROM AUTHOR]