We present the discovery of EPIC 228735255b , a P= 6.57 days Jupiter-mass ( M _ { P } = 1.019 \pm 0.070 M _ { Jup } ) planet transiting a V=12.5 ( G 5 -spectral type ) star in an eccentric orbit ( e= 0.120 ^ { +0.056 } _ { -0.046 } ) detected using a combination of K2 photometry and ground-based observations .
With a radius of 1.095 \pm 0.018 R _ { Jup } , the planet has a bulk density of 0.726 \pm 0.062 \rho _ { Jup } .
The host star has a [ Fe/H ] of 0.12 \pm 0.045 , and from the K2 light curve we find a rotation period for the star of 16.3 \pm 0.1 days .
This discovery is the 9th hot Jupiter from K2 and highlights K2 ’ s ability to detect transiting giant planets at periods slightly longer than traditional , ground-based surveys .
This planet is slightly inflated , but much less than others with similar incident fluxes .
These are of interest for investigating the inflation mechanism of hot Jupiters .