ModelPlan 173


Michael Whiting's


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%.


Ref:  MP173  16 Pages   Price:  7.60