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The star 55 Cancri was one of the first known exoplanet hosts and each of theplanets in this system is remarkable. Planets b and c are in a near 1:3resonance. Planet d has a 14.5 year orbit, and is one of the longest knownorbital periods for a gas giant planet. Planet e has a mass of 8 M? andtransits this bright star, providing a unique case for modeling of the interiorstructure and atmospheric composition of an exoplanet. Planet f resides in thehabitable zone of the star. If the planets are approximately co-planar, then byvirtue of having one transiting planet, this is a system where the Dopplertechnique has essentially measured the true mass of the planets, rather thanjust Msin i. The unfolding history of planet discovery for this system providesa good example of the challenges and importance of understanding the star tounderstand the planets.

55 Cancri (Copernicus): A Multi-Planet System with a Hot Super-Earth and a Jupiter Analogue