Sadao Sei
# Sadao Sei

Minor planets discovered: 1 :

| 2909 Hoshi-no-ie | 9 May 1983 | MPC |
| - | - | - |

Sadao Sei (清 貞雄, Sei Sadao) is a Japanese astronomer who discovered an asteroid in 1983.

He is credited by the Minor Planet Center with the discovery of 2909 Hoshi-no-ie, a main-belt asteroid of the Eos family, which he named after his observatory. The meaning of "Hoshi-no-ie" is "a star house". Naming citation was published on 17 February 1984 (M.P.C. 8544).

