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NGC 205, a close satellite of the M31 galaxy, is our nearest example of adwarf elliptical galaxy. Photometric and kinematic observations suggest thatNGC 205 is undergoing tidal distortion from its interaction with M31. Despiteearlier attempts, the orbit and progenitor properties of NGC 205 are not wellknown. We perform an optimized search for these unknowns by combining a geneticalgorithm with restricted N-body simulations of the interaction. This approach,coupled with photometric and kinematic observations as constraints, allows foran effective exploration of the parameter space. We represent NGC 205 as astatic Hernquist potential with embedded massless test particles that serve astracers of surface brightness. We explore 3 distinct, initially stableconfigurations of test particles: cold rotating disk, warm rotating disk, andhot, pressure-supported spheroid. Each model reproduces some, but not all, ofthe observed features of NGC 205, leading us to speculate that a rotatingprogenitor with substantial pressure support could match all of theobservables. Furthermore, plausible combinations of mass and scale length forthe pressure-supported spheroid progenitor model reproduce the observedvelocity dispersion profile. For all 3 models, orbits that best match theobservables place the satellite 11+/-9 kpc behind M31 moving at very largevelocities: 300-500 km/s on primarily radial orbits. Given that the observedradial component is only 54 km/s, this implies a large tangential motion forNGC 205, moving from the NW to the SE. These results suggest NGC 205 is notassociated with the stellar arc observed to the NE of NGC 205. Furthermore, NGC205's velocity appears to be near or greater than its escape velocity,signifying that the satellite is likely on its first M31 passage.

Darwin Tames an Andromeda Dwarf: Unraveling the Orbit of NGC 205 Using a Genetic Algorithm