5917 Chibasai (provisional designation: 1991 NG) is a main-belt minor planet. It was discovered by Eleanor F. Helin at the Palomar Observatory in San Diego County, California, on July 7, 1991. It is named for the Chiba Science Association (Chiba Sai), a Japanese non-profit organization established in 2001 to promote science education in Chiba Prefecture.
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