What is 216 Kleopatra?
<!-- Additional parameters for this template are available at [[Template:Infobox Planet]]. -->{{Infobox Planet | bgcolour=#FFFFC0 | name=216 Kleopatra | discoverer=[[Johann Palisa]] | discovered=[[April 10]], [[1880]] | alt_names=A905 OA, A910 RA | mp_category=[[Asteroid belt|Main belt]] | epoch=[[30 January]], [[2005]] ([[Julian day|JD]] 2453400.5) | semimajor=417.796 [[Giga|G]][[metre|m]] (2.793 [[Astronomical unit|AU]]) | perihelion=312.544 Gm (2.089 AU) | aphelion=523.049 Gm (3.496 AU) | eccentricity=0.252 | period=1704.704 [[day|d]] (4.67 [[Julian year (astronomy)|a]]) | inclination=13.136[[degree (angle)|°]] | asc_node=215.672° | arg_peri=179.099° | mean_anomaly=55.259° | avg_speed=17.82 km/[[second|s]] | dimensions=217 × 94 × 81 km | mass=''unknown'' | density=''3.5+'' | surface_grav= | escape_velocity= | rotation=5.385 [[hour|h]] | spectral_type=[[M-type asteroid|M]] | abs_magnitude=7.3 | albedo=0.116 | single_temperature=''unknown''}} '''216 Kleopatra''' is a [[Asteroid belt|Main belt]] [[asteroid]] found by [[Johann Palisa]] on [[April 10]], [[1880]] in [[Pula|Pola]]. It is named after [[Cleopatra VII of Egypt|Cleopatra]], the Queen of [[Egypt]]. It is a [[dumbbell]]-shaped [[Asteroid spectral types|M-class (metallic) asteroid]]. [[File:Asteroid-Kleopatra-radar.png|left|thumb|Dog bone shaped asteroid Kleopatra]] Kleopatra is an unusual object. Its odd shape was revealed by [[adaptive optics]] on the [[ESO]] 3.6m telescope at La Silla. By bouncing radar signals off the asteroid, a team of astronomers at the [[Arecibo Observatory|Arecibo radio telescope]] in [[Puerto Rico]] were able to develop a more detailed computer model of its shape, which confirmed the dog-bone like shape. A favored explanation is that Kleopatra is a [[contact binary (asteroid)|contact binary]]: two similarly-sized asteroids that have hit and stuck together instead of breaking apart. Kleopatra is a fairly big asteroid, measuring 217 × 94 × 81&nbsp;km. It is believed to be a loosely packed metallic obj