Mission Type: Lander
Launch Vehicle: Atlas Centaur (AC-11 / Atlas D no. 291 / Centaur D)
Launch Site: Eastern Test Range / launch complex 36A, Cape Canaveral, USA
NASA Center: Jet Propulsion Laboratory
Spacecraft Mass: 1037.4 kg at launch, about 300 kg at landing (if it landed)
Spacecraft Instruments: 1) imaging system; 2) surface sampler; and 3) soil magnet
Spacecraft Dimensions: 3 m tall; footpads extended 4.3 m from center
Maximum Power: 85 W
Total Cost: The entire program of seven Surveyor spacraft cost about $469 million.
Deep Space Chronicle: A Chronology of Deep Space and Planetary Probes 1958-2000, Monographs in Aerospace History No. 24, by Asif A. Siddiqi
National Space Science Data Center, http://nssdc.gsfc.nasa.gov/
Solar System Log by Andrew Wilson, published 1987 by Jane's Publishing Co. Ltd.
Like Surveyor 3, Surveyor 4 was equipped with a surface claw (with a magnet in the claw) to detect and measure ferrous elements in the lunar surface.
The mission was completely successful until all communications were abruptly lost 2 seconds prior to retrorocket cutoff at 02:03 UT on 17 July 1967, with only 2.5 minutes left to landing on the Moon. The landing target was Sinus Medii (Central Bay) at 0.4° north latitude and 1.33° west longitude.
NASA concluded that the lander might have exploded when contact was lost.