Surveyor 4

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Surveyor 4
Surveyor mockup.jpg
Surveyor model on Earth
Mission type Lunar lander
Operator NASA
COSPAR ID 1967-068A
SATCAT no. 02875
Mission duration 65 hours
Failed to land
Spacecraft properties
Manufacturer Hughes Aircraft
Dry mass 282 kilograms (622 lb)
Start of mission
Launch date July 14, 1967, 11:53:29 (1967-07-14UTC11:53:29Z) UTC
Rocket Atlas LV-3C Centaur-D
Launch site Cape Canaveral LC-36A
End of mission
Last contact 17 July 1967, 02:02:30 (1967-07-17UTC02:02:31Z) UTC (approx)
Lunar impact (failed landing)
Impact date July 17, 1967, 02:05:00 UTC
Impact site 0°27′N 1°23′W / 0.45°N 1.39°W / 0.45; -1.39

Surveyor 4 was the fourth lunar lander in the American unmanned Surveyor program sent to explore the surface of the Moon. This spacecraft crashed after an otherwise flawless mission; telemetry contact was lost 2.5 minutes before touchdown. The planned landing target was Sinus Medii (Central Bay) at 0.4° north latitude and 1.33° west longitude.


This spacecraft was the fourth in a series designed to achieve a soft landing on the Moon and to return photography of the lunar surface for determining characteristics of the lunar terrain for Apollo lunar landing missions. Equipment on board included a television camera and auxiliary mirrors, a soil mechanics surface sampler, strain gauges on the spacecraft landing legs, and numerous engineering sensors. Like Surveyor 3, Surveyor 4 was also equipped with a surface claw (with a magnet in the claw) to detect and measure ferrous elements in the lunar surface.

After a flawless flight to the Moon, radio signals from the spacecraft ceased during the terminal-descent phase at 02:03 UT on 17 July 1967, approximately 2.5 minutes before touchdown. Contact with the spacecraft was never reestablished, and the mission was unsuccessful. The solid-fuel retrorocket may have exploded near the end of its scheduled burn.[1]

See also[edit]


  1. ^ "Surveyor 4". NASA Space Science Data Coordinated Archive. NASA. 

External links[edit]