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216 Kleopatra

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Discovered by  Johann Palisa
Named after  Cleopatra VII
Minor planet category  Main belt
Orbital period  1,705 days
Orbits  Sun
Discoverer  Johann Palisa
Discovery date  April 10, 1880
Alternative names  A905 OA, A910 RA
Aphelion  3.496 AU (523.049 Gm)
Discovered  10 April 1880
Spectral type  M-type asteroid
Moons  Cleoselene, Alexhelios
216 Kleopatra wwwgeocitieswszlipanovselectedasteroids216k
Similar  Johann Palisa discoveries, Other celestial objects

Occultations by 216 kleopatra the dog bone asteroid


216 Kleopatra (/ˌkləˈpætrə, -ˈpɑː-, -ˈp-/) is an asteroid orbiting in the asteroid belt. It was discovered by Austrian astronomer Johann Palisa on April 10, 1880, from Pula. It is named after Cleopatra, the famous queen of Ancient Egypt. The asteroid is notable for its peculiar shape that resembles that of a ham-bone. In 2008, it was discovered to be a ternary asteroid, having two small moons.

Contents

216 Kleopatra APOD 2000 May 10 DogBone Shaped Asteroid 216 Kleopatra

216 kleopatra 12242009 avi


Physical characteristics

216 Kleopatra 216 Kleopatra Ian Amaral Flickr

Kleopatra is a relatively large asteroid, measuring 217 × 94 × 81 km. Calculations from its radar albedo and the orbits of its moons show it to be a rubble pile, a loose amalgam of metal, rock, and 30–50% empty space by volume, likely due to a disruptive impact prior to the impact that created its moons.

216 Kleopatra APOD 2000 May 10 DogBone Shaped Asteroid 216 Kleopatra

Kleopatra has an unusual shape. Initial observations with the ESO 3.6 m Telescope at La Silla, run by the European Southern Observatory, were interpreted to show a double source with two distinct lobes of similar size. These results were disputed when radar observations at the Arecibo Observatory showed that the two lobes of the asteroid are connected, resembling the shape of a ham-bone. The radar observations provided a detailed shape model that appeared on the cover of Science Magazine.

Moons

216 Kleopatra 216 Kleopatra ferrebeekeeper

In 1988 a search for satellites or dust orbiting this asteroid was performed using the UH88 telescope at the Mauna Kea Observatories, but the effort came up empty. In September 2008, Franck Marchis and his collaborators announced that by using the Keck Observatory's adaptive optics system, they had discovered two moons orbiting Kleopatra. The outer and inner satellites are about 5 km and 3 km in diameter, respectively.

In February 2011 the moons were named Alexhelios (/ˌælksˈhlis/, outer) and Cleoselene (/ˌklsˈln/, inner), after Cleopatra's children Alexander Helios and Cleopatra Selene II.

Origin

It is believed that Kleopatra's shape, rotation, and moons are due to an oblique impact perhaps 100 million years ago. The increased rotation would have elongated the asteroid and caused Alexhelios to split off. Cleoselene may have split off later, around 10 million years ago. Kleopatra is a contact binary - if it were spinning much faster, the two lobes would separate from each other, making a true binary system.

References

216 Kleopatra Wikipedia


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