Located near Amado, Arizona, on Mount Hopkins, the Fred Lawrence Whipple Observatory has the following facilities:
The 6.5-meter MMT (256-inch), a joint facility operated with the University of Arizona, for solar system, galactic and extragalactic astronomy.
1.3-meter (51-inch) PAIRITEL (Peters Automated IR Imaging Telescope, ex-2MASS
) reflector, for infrared observations, especially of gamma-ray bursts, supernovae and other variable sources.
The HAT (Hungarian Automated Telescope) network of optical refractor telescopes, used for robotic observations of the night sky.
MEarth is a transit survey of about 2000 nearby M-dwarf stars. It is a fully
robotic system with 8 independent 0.4m-diameter reflectors that monitor
these stars every night.