  In the present paper we report the discovery of a new hot Jupiter,
EPIC211089792 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 +/- 0.04 Mjup, and a radius of 1.19 +/- 0.02 Rjup. 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.
