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Surveyor 4 was the fourth lunar lander in the American uncrewed 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.

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Surveyor 4

Surveyor model on Earth
Mission type	Lunar lander
Operator	NASA
COSPAR ID	1967-068A
SATCAT no.	02875
Mission duration	62 hrs. 9 min. 1 sec. (launch to last contact)
Spacecraft properties
Manufacturer	Hughes Aircraft
Launch mass	1,039 kg[1]
Dry mass	283 kilograms (624 lb)[2]
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	July 17, 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	0.45°N 1.39°W / 0.45; -1.39
Surveyor ← Surveyor 3 Surveyor 5 →

Surveyor 6 successfully landed near the crash site of Surveyor 4 a few months later in November 1967.

Equipment

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.[3]

After a flawless flight to the Moon, radio signals from the spacecraft ceased during the terminal-descent phase at 02:03 UT on July 17, 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.[2]

See also

• 1967 in spaceflight
• List of artificial objects on the Moon

References

External links

• Surveyor Program Results (PDF) 1969

На других языках

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[de] Surveyor 4

Surveyor 4 war die vierte Sonde der US-amerikanischen Raumfahrtagentur NASA im Rahmen des Surveyor-Programms. Das Surveyor-Programm war Nachfolger des Ranger-Programms. Die Ergebnisse des Programms sollten die erste bemannte Mondlandung vorbereiten. Surveyor 4 sollte unbeschädigt auf dem Mond landen und von dort Bilder und Daten zur Erde übermitteln.

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- [en] Surveyor 4

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[ru] Сервейер-4

«Серве́йер-4» (англ. Surveyor 4) — четвёртый американский беспилотный аппарат, являющийся частью лунной программы «Сервейер» и запущенный с целью мягкой посадки на Луну, а также исследований на её поверхности. Спускаемый аппарат разбился после потери связи, произошедшей за 2,5 минуты до прилунения.

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