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Parkes ObservatoryThe Parkes Observatory is a radio telescope observatory, 20 kilometres north of the town of Parkes, New South Wales, Australia. The primary observing instrument is the 64-metre Parkes Radio Telescope, the largest movable dish in the Southern Hemisphere. It was completed in 1961 and has operated almost continuously to the present day. The dish surface was physically upgraded by adding smooth metal plates to the central part of the dish to provide focusing capability for centimetre and millimetre length microwaves. The outer part of the dish remains a fine metal mesh, creating its distinctive "two-tone" appearance. The telescope has an altazimuth mount. It is guided by a small mock-telescope placed within the structure at the same rotational axes as the dish, but with an equatorial mount. The two are dynamically locked when tracking an astronomical object by a laser guiding system. The receiving cabin is located at the focus of the parabolic dish, supported by three struts 27 metres above the dish. The cabin contains multiple radio and microwave detectors, which can be switched into the focus beam for different science observations. The observatory is a part of the Australia Telescope National Facility network of radio telescopes. The 64m dish is frequently operated together with the Australia Telescope Compact Array at Narrabri and a single dish at Mopra, to form a very long baseline interferometry array. During the Apollo missions to the moon, the Parkes Observatory was used to relay communication and telemetry signals to NASA, providing coverage for when the moon was on the Australian side of the Earth. The observatory and telescope were featured in the 2001 film The Dish, a fictionalised account of the observatory's involvement with the Apollo moon landings. External link
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