The orbits of Neptune and Pluto interact, which has recently led to the re-classification of Pluto within the Solar System. However, the interaction of the orbits goes so much further than a mere crossing and has, at its core, the fact that Pluto makes two orbits of the Sun in approximately the time that Neptune takes to do three orbits. A similar but subtly different situation exists for the minor planet Hilda to Jupiter. Hilda makes three orbits around the same time that Jupiter takes to make two. However, both, Pluto and Hilda are the proto-types of a larger collection of objects. This talk will consider some of the aspects of the orbits and the surprises that can be unearthed by considering the orbits.

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About the speaker: Dr. Colin Steele

Colin Steele, is an amateur astronomer with professional experience who enjoys giving talks on a wide variety of astronomical topics. Inspired by early events including Apollo Moon landings. Studied Mathematics and Astronomy and Astrophysics, St Andrews University, 1982-1986. PhD in Applied Mathematics (Dynamics of Solar Prominences), 1986-1990. Teaching of Mathematics to students in many parts of University of Manchester, since 1993. Joined Dundee AS, 1978. BAA 1985, Many other societies. Member of IAU.