5335 Damocles
(5335) Damocles /ˈdæməkliːz/, provisional designation 1991 DA, is a centaur and the namesake of the damocloids, a group of minor planets which may be inactive nuclei of the Halley-type and long-period comets.It was discovered on 18 February 1991, by Australian astronomer Robert McNaught at Siding Spring Observatory in Australia.[9] Duncan Steel, Gerhard Hahn, Mark Bailey, and David Asher carried out projections of its long-term dynamical evolution, and found a good probability that it will become an Earth-crosser asteroid, and may spend a quarter of its life in such an orbit.[12] The object has a Mars minimum orbit intersection distance (Mars MOID) of 0.057 AU (8,500,000 km; 5,300,000 mi) and a Uranus MOID of 0.3 AU (45,000,000 km; 28,000,000 mi).[6] The official naming citation was published by the Minor Planet Center on 1 September 1993 (M.P.C.