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Asteroid 117539 Celletti = 2005 DJ1 is an asteroid named after Alessandra Celletti, who is an associate professor at the University of Roma "Tor Vergata", where she teaches celestial mechanics and the theory of dynamical systems.

From 72 observations at 5 oppositions, 1994-2005, mean residual 0".53.

Last observed on May 28, 2006. Perturbed ephemeris below based on elements from MPO 84224.

The discovery date was 17 February 2005 at La Silla Observatory. The discoverers were Boattini, A. and Scholl, H.