Editing 1989 in science (section)

==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 [[Rings of Neptune|the planet's rings]].
* September 5 – [[Pluto]]–[[Charon (moon)|Charon]] [[Earth-Moon barycenter|barycentre]] comes to [[Apsis|perihelion]].<ref>{{cite web|title=Horizon Online Ephemeris System for Pluto Barycenter|publisher=[[JPL Horizons On-Line Ephemeris System]] @ Solar System Dynamics Group|url=http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=mb&sstr=9|accessdate=January 16, 2011}}</ref>
*[[5128 Wakabayashi|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.