57 Mnemosyne (/nɨˈmɒsɨniː/ ni-MOS-i-nee) is a large main belt asteroid. It is an S-type asteroid in composition. It was discovered by Robert Luther on September 22 1859 from Düsseldorf. Its name was chosen by Martin Hoek director of the Utrecht Observatory in reference to Mnemosyne a Titaness in Greek mythology.
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