Physical Characteristics
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 in 1983. During the same 1979 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 in 1983 are listed on the JPL Small-Body Database as 237.26 km (118.63 km radius) as of 2010.
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“A man’s thinking goes on within his consciousness in a seclusion in comparison with which any physical seclusion is an exhibition to public view.”
—Ludwig Wittgenstein (1889–1951)