Asteroid 216 Kleopatra, recently mapped with Earth-based radar, reflects radio waves so well that astronomers speculate it is composed mostly.
The asteroid, named 216 Kleopatra, is a large object in the main asteroid belt between Mars and Jupiter; it measures about 135 miles.
Triple Asteroid System (216) Kleopatra. This movie shows the moons AlexHelios and CleoSelene. Working together to fund our Shoemaker NEO Grants for astronomers, we can help save the world. Marchis, Franck, Berthier, J. Planetary Society Names Things. Editor-in-Chief: Keith Cowing Email Twitter. Thesis Near-IR reflectance spectroscopy of asteroids and study of the thermal history of the main asteroid 216 Kleopatra.