See our Videos page!



April, 2010: APOLLO detects lost Soviet reflector.

October, 2009: LCROSS event.

May, 2009: APO featured on PBS film 400 Years of the Telescope.

April 3, 2009: For the International Year of Astronomy, APO is featured in a 20-minute segment during a 100-hour webcast.


ARC 3.5m | Quicklinks

Instrument News: Current Status

Instrument Summary

Users Manuals

Wiki by and for users


Information for planning class trips

Current Weather

Proposal Sample

Telescope Schedule


Filters Inventory

Accessing Data

APO Password Access

3.5m Nightlogs

Printable Observing Log

Instrument Fills

Eng Docs