The VATT telescope has an Alt/Az mount and uses a 1.8-m f/1.0 honeycombed construction, borosilicate primary mirror developed by the University of Arizona Mirror Lab. Its secondary mirror is a 0.38-m f/0.9 Zerodur manufacted by the Space Optics Research Laboratory 1).
Both observing time and responsibility for VATT are shared with the University of Arizona on a 75% The Vatican Observatory Research Group VORG, 25% 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.2)
Altitude : 3191 meters = 10,469 ft Latitude : 32° 42' 04.69" N Longitude : 109° 53' 31.25" W Optical System : aplanatic Gregorian, f/9 Focal Length : 16.48 m Primary Mirror : f/1.0, Diameter 1.83 meters = 72 inches Secondary Mirror : f/0.9, Diameter 0.38 meters = 14.96 inches Back Focal Distance : 50.80 mm (effective) Vignetting-Free Field : 72 mm diameter (15 arcmin) Image Scale : 12.52 arcsec/mm Image quality : 0.1 arcsec throughout 6.8 arcmin diameter flat FOV Mount : altitude-azimuth with derotator