The Kepler mission has revealed a great diversity of planetary systems and architectures , but most of the planets discovered by Kepler orbit faint stars .
Using new data from the K2 mission , we present the discovery of a five planet system transiting a bright ( V = 8.9 , K = 7.7 ) star called HIP 41378 .
HIP 41378 is a slightly metal-poor late F-type star with moderate rotation ( v \sin i \simeq 7 km s ^ { -1 } ) and lies at a distance of 116 \pm 18 pc from Earth .
We find that HIP 41378 hosts two sub-Neptune sized planets orbiting 3.5 % outside a 2:1 period commensurability in 15.6 and 31.7 day orbits .
In addition , we detect three planets which each transit once during the 75 days spanned by K2 observations .
One planet is Neptune sized in a likely \sim 160 day orbit , one is sub-Saturn sized likely in a \sim 130 day orbit , and one is a Jupiter sized planet in a likely \sim 1 year orbit .
We show that these estimates for the orbital periods can be made more precise by taking into account dynamical stability considerations .
We also calculate the distribution of stellar reflex velocities expected for this system , and show that it provides a good target for future radial velocity observations .
If a precise orbital period can be determined for the outer Jovian planet through future observations , it will be an excellent candidate for follow-up transit observations to study its atmosphere and measure its oblateness .