Sadao Sei
| 2909 Hoshi-no-ie | 9 May 1983 |
Sadao Sei 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.