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The 1.8 meter 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.

It achieved its first light in 1993. The Vatican Advanced Technology Telescope (VATT), the main telescope of the Vatican Observatory. The dome to the left houses the telescope itself; the space to the right are the control room and the living space for the observers.

https://commons.wikimedia.org/wiki/File:VaticanObservatory_VATT.jpg