Most people choose to replace pluto with the sun (which needs the handbox patched), which makes it much easier to find (only needs to scroll through a few objects under "planets").
Looks at this page for Dick Seymour's Patches, one of which can replace Pluto with the sun.
http://rseymour.home.wolfenet.com/patches/.
Go right down to the bottom for the latest patch. You can turn on/off most options of the patches as you like.
Lot of extra info here:
Check out Mike Weasner's ETX site, specifically the pages on Autostar
http://www.weasner.com/etx/autostar_info.html