In the present paper we report the discovery of a new hot Jupiter , EPIC211089792Â b , first detected by the Super-WASP observatory and then by the K2 space mission during its campaign 4 .
The planet has a period of 3.25d , a mass of 0.73 \pm 0.04 \mathrm { M } _ { \jupiter } , and a radius of 1.19 \pm 0.02 \mathrm { R } _ { \jupiter } .
The host star is a relatively bright ( V=12.5 ) G7 dwarf with a nearby K5V companion .
Based on stellar rotation and the abundance of Lithium , we find that the system might be as young as about 450 Myr .
The observation of the Rossiter-McLaughlin effect shows the planet is aligned with respect to the stellar spin .
Given the deep transit ( 20mmag ) , the magnitude of the star and the presence of a nearby stellar companion , the planet is a good target for both space- and ground-based transmission spectroscopy , in particular in the near-infrared where the both stars are relatively bright .