Both observing time and responsibility for VATT are shared with the University of Arizona on a 75% VORG, 25% Arizona basis. Limited resources prevent VATT from being a visitor observatory, but collaborations are welcomed by VORG, especially when suitable instrumentation is provided for shared use at VATT.

For instance, a three-year agreement was made by the Vatican Observatory with the University of Notre Dame, Indiana (UND), for an Association which provided the UND Department of Physics with 20 nights on VATT per annum.