Two Extrasolar Orreries
An extrasolar planet, or exoplanet, is a planet beyond our Solar System. As at May, 2007, the count of known exoplanets stands at 234. They have mainly been detected by a variety of indirect methods rather than direct imaging. Two extrasolar systems, 55 Cancri A and Mu Arae, have been found to have (at least) 4 planets and these are the subject of this model plan.
As with recent previous Modelplans 156, 160 and 163 the scope of each model has been confined to a set 10; nevertheless the accuracy of the relative periods which has been achieved is better than 0.1%.
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