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We present a new precision radial velocity dataset that reveals amulti-planet system orbiting the G0V star HD 34445. Our 18-year span consistsof 333 precision radial velocity observations, 56 of which were previouslypublished, and 277 which are new data from Keck Observatory, Magellan at LasCampanas Observatory, and the Automated Planet Finder at Lick Observatory.These data indicate the presence of six planet candidates in Keplerian motionabout the host star with periods of 1057, 215, 118, 49, 677, and 5700 days, andminimum masses of 0.63, 0.17, 0.1, 0.05, 0.12 and 0.38 Jupiter massesrespectively. The HD 34445 planetary system, with its high degree ofmultiplicity, its long orbital periods, and its induced stellar radial velocityhalf-amplitudes in the range $2 \,{\rm m\, s^{-1}} \lesssim K \lesssim 5\,{\rmm\, s^{-1}}$ is fundamentally unlike either our own solar system (in which onlyJupiter and Saturn induce significant reflex velocities for the Sun), or theKepler multiple-transiting systems (which tend to have much more compactorbital configurations)

A Six-Planet System Around the Star HD 34445