Asteroid 118230, Sado, was discovered on November 30, 1996 by Naoto Sato at his private observatory, Chichibu Astronomical Observatory in Chichibu, Saitama, Japan. It has a period of 4 years, 173 days.

It was named for Sado, an island in the Sea of Japan off the coast of Honshu in Niigata Prefecture, appears even in Japan's oldest history book Kojiki, dating to the eighth century. The island is currently famous as the place where Noh drama (one of the "World's Intangible Cultural Treasures") took root in the lives of the people on the island. American soldier, deserter, and captive of North Korea Charles Robert Jenkins married a woman from Sado kidnapped from the island by the North Koreans, along with her mother, who disappeared, and spent his last years living with her on Sado.

Asteroid Sado, however, seems to mean: to mistreat, to abuse, to be sadistic, to be sad; possibly also, setting oneself apart, or having been set apart or exiled; an exposed place of danger.

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