216 Kleopatra

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216 Kleopatra
Discovery
Discovered by Johann Palisa
Discovery time April 10, 1880
Names
Other names A905 OA, A910 RA
Group Main belt
Orbit
Reference date 30 January, 2005 (JD 2453400.5)
Longest distance from the Sun 523.049 Gm (3.496 AU)
Shortest distance from the Sun 312.544 Gm (2.089 AU)
Longest distance from the center of its orbital path
("semi-major axis")
417.796 Gm (2.793 AU)
How egg-shaped its orbit is
("eccentricity")
0.252
How long it takes to complete an orbit 1704.704 d (4.67 a)
Average speed 17.82 km/s
Mean anomaly 55.259°
Angle above the reference plane
("inclination")
13.136°
Longitude of where it comes up through the reference plane 215.672°
Angle between its shortest distance from what it orbits around and where it comes up through the reference plane
("argument of periapsis")
179.099°
Size and Other Qualities
Measures 217 × 94 × 81 km
Mass unknown
Average density 3.5+
How long it takes to turn around one time 5.385 h
How much light it reflects 0.116
Avg. surface temp. unknown
Light-band group
("spectral type")
M
True brightness
("absolute magnitude")
7.3

216 Kleopatra is a Main belt asteroid found by Johann Palisa on April 10, 1880 in Pola. It is named after Cleopatra, the Queen of Egypt.

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 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: two similarly-sized asteroids that have hit and stuck together instead of breaking apart.

Kleopatra is a fairly big asteroid, measuring 217 × 94 × 81 km. It is believed to be a loosely packed metallic object, based on its radar albedo.

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