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I would of included asteroids as a seperate field too (and they cant be lumped with comets - two different camps mostly - althought there are crossover area's) it has pretty big following especially amongst the orbital mechanics crew - who compete who can derive the orbit from as little initial info first - these also include the comet camp as well a crossover point there. Orbital mechanics is a big 'thing' I have found from the net - that also branches into the sport of matching old orbits of comets/asteroids from history too new discoveries.
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