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1989 in science : ウィキペディア英語版 | 1989 in science
The year 1989 in science and technology involved many significant events, some listed below. ==Astronomy==
* August – Asteroid 4769 Castalia is the first asteroid directly imaged, by radar from Arecibo. * August 25 – The ''Voyager 2'' spacecraft makes its closest approach to Neptune, providing definitive proof of the planet's rings. * September 5 – Pluto–Charon barycentre comes to perihelion.〔(【引用サイトリンク】publisher=JPL Horizons On-Line Ephemeris System @ Solar System Dynamics Group )〕 *Asteroid 5128 Wakabayashi is discovered by Masahiro Koishikawa. *4292 Aoba is discovered. *4871 Riverside is discovered. *6089 Izumi is discovered. *6190 Rennes is discovered *8084 Dallas is discovered.
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