65 Cybele (pronounced /ˈsɪbɨliː/ SIB-əl-ee, or as in Greek Κυβέλη) is one of the largest asteroids in the main belt. It gives its name to the Cybele asteroids which orbit outward from the Sun from the 2:1 orbital resonance with Jupiter. As a C-type asteroid it is dark in color and carbonaceous in composition. It was discovered on March 8, 1861 by Ernst Tempel and named after Cybele the earth goddess.
The first Cybelian stellar occultation was observed on October 17, 1979 in the Soviet Union. The asteroid appeared to have an irregular shape, with the longest chord being measured as 245 km, closely matching the diameter of 237 km determined by the IRAS satellite. During the same occultation, a hint of a possible 11 km wide satellite was detected.
In 1985, Green estimated Cybele to have a diameter of 330 km. In 2004, Müller estimated Cybele using thermophysical modelling (TPM) to have dimensions of 302×290×232 km. The diameter from IRAS observations as listed on JPL was 237.26 km (118.63 km radius).
On October 11, 2009, Cybele was expected to occult a 13.4 magnitude star in the constellation Aquarius.
1. ^ a b c d e f "JPL Small-Body Database Browser: 65 Cybele". 2008-08-10 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=65. Retrieved 2008-11-25.
* Orbital simulation from JPL (Java) / Ephemeris
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