Arecibo Observatory HC03 Box 53995 Arecibo, Puerto Rico 00612 Phone: 787-878-2612 Fax: 787-878-1861 Organization Cornell, NSF Location Arecibo, Puerto Rico Wavelength radio (3 cm–1 m) Built 1963 Telescope style spherical reflector Diameter 305 m (1,000 ft) Collecting area ~73,000 m², ~790,000 ft², ~18 acres Focal length 265.109 m, 869 ft 9.38 in (265.109 m) Mounting semi-transit telescope: fixed primary with secondary (Gregorian reflectors) and a delay-line feed on tracks for pointing Dome none Website www.naic.edu