|Nation||United States of America (USA)|
|Spacecraft Mass||2,287 pounds (1,037.4 kilograms)|
|Mission Design and Management||NASA / JPL|
|Launch Vehicle||Atlas Centaur (AC-11 / Atlas D no. 291 / Centaur D)|
|Launch Date and Time||July 14, 1967 / 11:53:29 UT|
|Launch Site||Cape Canaveral, Fla. / Launch Complex 36A|
|Scientific Instruments||1. TV Camera
2. Surface Sampler
July 14, 1967: Launch
July 17, 1967: Communication lost
In Depth: Surveyor 4
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 appeared successful until all communications were abruptly lost two seconds prior to retro-rocket cutoff at 02:03 UT July 17, 1967, just two-and-a-half minutes before landing on the Moon. The landing target was Sinus Medii (Central Bay) at 0.4 degrees north latitude and 1.33 degrees west longitude.
NASA believed that the solid propellant retro-rocket might have exploded, destroying the vehicle.
Siddiqi, Asif A. Beyond Earth: A Chronicle of Deep Space Exploration, 1958-2016. NASA History Program Office, 2018.