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We report new photometric and spectroscopic observations of the K2-99planetary system. Asteroseismic analysis of the short-cadence light curve fromK2's Campaign 17 allows us to refine the stellar properties. We find K2-99 tobe significantly smaller than previously thought, with $R_{\star} =2.55\pm0.02$ $\mathrm{R_\odot}$. The new light curve also contains fourtransits of K2-99b, which we use to improve our knowledge of the planetaryproperties. We find the planet to be a non-inflated warm Jupiter, with$R_\mathrm{b} = 1.06 \pm 0.01$ $\mathrm{R_{Jup}}$. Sixty new radial velocitymeasurements from HARPS, HARPS-N, and HIRES enable the determination of theorbital parameters of K2-99c, which were previously poorly constrained. We findthat this outer planet has a minimum mass $M_\mathrm{c} \sin i_\mathrm{c} =8.4\pm0.2$ $\mathrm{M_{Jup}}$, and an eccentric orbit ($e_\mathrm{c} = 0.210\pm 0.009$) with a period of $522.2\pm1.4$ d. Upcoming TESS observations in2022 have a good chance of detecting the transit of this planet, if the mutualinclination between the two planetary orbits is small.

K2-99 revisited: a non-inflated warm Jupiter, and a temperate giant planet on a 522-d orbit around a subgiant