Vatican Advanced Technology Telescope

The Alice P. Lennon Telescope and its Thomas J. Bannan Astrophysics Facility, known together as the Vatican Advanced Technology Telescope (VATT), is a Gregorian telescope observing in the optical and infrared situated on Mount Graham in southeast Arizona, United States. Measuring 1.83 m (6 ft 0 in) primary diameter, the telescope achieved its first light in 1993.