Tags: Asteroid.
129561 Chuhachi (provisional designation: 1997 CS21) is a main-belt minor planet. It was discovered by Akimasa Nakamura at the Kuma Kogen Astronomical Observatory in Kumakōgen Ehime Prefecture Japan on February 9 1997. It is named after Chūhachi Ninomiya a Japanese aviation pioneer of the 19th and 20th centuries.