title: Radar observations of asteroid 216 kleopatra
abstract: Radar observations of the main-belt, M-class asteroid 216 Kleopatra reveal a dumbbell-shaped object with overall dimensions of 217 kilometers by 94 kilometers by 81 kilometers (+/-25%). The asteroid's surface properties are consistent with a regolith having a metallic composition and a porosity comparable to that of lunar soil. Kleopatra's shape is probably the outcome of an exotic sequence of collisional events, and much of its interior may have an unconsolidated rubble-pile structure.
authors.affiliation: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, USA. School of Electrical Engineering and Computer Science, Washington State University, Pullman, WA 99164-2752, USA. Arecibo Observatory, HC3 Box.
authors.initials: SJ
authors.lastname: Ostro
authors.initials: RS
authors.lastname: Hudson
authors.initials: MC
authors.lastname: Nolan
authors.initials: JL
authors.lastname: Margot
authors.initials: DJ
authors.lastname: Scheeres
authors.initials: DB
authors.lastname: Campbell
authors.initials: C
authors.lastname: Magri
authors.initials: JD
authors.lastname: Giorgini
authors.initials: DK
authors.lastname: Yeomans