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We report the discovery of a second long-period giant planet orbiting HD30177, a star previously known to host a massive Jupiter analog (HD 30177b:a=3.8$\pm$0.1 au, m sin $i=9.7\pm$0.5 Mjup). HD 30177c can be regarded as amassive Saturn analog in this system, with a=9.9$\pm$1.0 au and m sin$i=7.6\pm$3.1 Mjup. The formal best fit solution slightly favours a closer-inplanet at $a\sim$7 au, but detailed n-body dynamical simulations show thatconfiguration to be unstable. A shallow local minimum of longer-period,lower-eccentricity solutions was found to be dynamically stable, and hence weadopt the longer period in this work. The proposed $\sim$32 year orbit remainsincomplete; further monitoring of this and other stars is necessary to revealthe population of distant gas giant planets with orbital separations $a\sim$10au, analogous to that of Saturn.

The Anglo-Australian Planet Search XXV: A Candidate Massive Saturn Analog Orbiting HD 30177