Editing Surveyor 4

{{Short description|Space probe}}
{{More citations needed|date=March 2014}}
{{Use American English|date=January 2014}}
{{Use mdy dates|date=May 2020}}
{{Infobox spaceflight
| name               = Surveyor 4
| image              = Surveyor mockup.jpg
| image_caption      = Surveyor model on Earth
| mission_type       = Lunar [[Lander (spacecraft)|lander]]
| operator           = [[NASA]]
| website            = 
| COSPAR_ID          = 1967-068A
| SATCAT             = 02875
| mission_duration   = 62 hrs. 9 min. 1 sec. (launch to last contact)
| spacecraft_type    = 
| manufacturer       = [[Hughes Aircraft]]
| dry_mass           = {{convert|283|kg|lb}}<ref name="nasa">{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1967-068A|title=Surveyor 4|website=NASA Space Science Data Coordinated Archive|publisher=NASA}}</ref>
| launch_mass        = 1,037.4 kg<ref name="Surveyor 4">{{cite web|url=https://solarsystem.nasa.gov/missions/surveyor-4/in-depth/ |title=Surveyor 4 |date=December 27, 2017 |publisher=NASA's Solar System Exploration website |access-date=December 2, 2022}}</ref>
| power              = <!-- [[watt]]s -->
| launch_date        = {{start-date|July 14, 1967, 11:53:29|timezone=yes}}&nbsp;UTC <ref name="Surveyor 4"></ref>
| launch_rocket      = [[Atlas-Centaur|Atlas LV-3C Centaur-D]] AC-11
| launch_site        = [[Cape Canaveral Air Force Station|Cape Canaveral]] [[Cape Canaveral Air Force Station Space Launch Complex 36|LC-36A]]
| launch_contractor  = 
| last_contact       = {{end-date|July 17, 1967, 02:02:30|timezone=yes}}&nbsp;UTC (approx)
| orbit_epoch        = 
| orbit_reference    = <!--transfer orbit-->
| orbit_periapsis    = 
| orbit_apoapsis     = 
| orbit_inclination  = 
| apsis              = 
| interplanetary     = {{Infobox spaceflight/IP
  |type        = lander_impact
  |object       = [[Moon|Lunar]]
  |arrival_date    = July 17, 1967, 02:05:00&nbsp;UTC
  |location      = {{Lunar coords and quad cat|0.45|N|1.39|W}}
 }}
| programme          = ''[[Surveyor program|Surveyor]]''
| previous_mission   = [[Surveyor 3]]
| next_mission       = [[Surveyor 5]]
}}

'''Surveyor 4''' is the fourth lunar lander in the [[United States|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.

[[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 [[Project Apollo|Apollo]] lunar landing missions. Equipment on board included a television [[camera]] and auxiliary mirrors, a soil mechanics surface sampler, [[strain gauge]]s 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.<ref>{{cite web|url=https://solarsystem.nasa.gov/missions/surveyor-4/in-depth|title=Surveyor 4|work=NASA|date=December 27, 2017 |access-date=14 March 2022}}</ref>

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 rocket|solid-fuel]] [[retrorocket]] may have exploded near the end of its scheduled burn.<ref name="nasa" />

{{Commons category}}

==See also==
{{Portal|Spaceflight}}
* [[1967 in spaceflight]]
* [[List of artificial objects on the Moon]]
* [[List of missions to the Moon]]

==References==
{{Reflist}}

==External links==
* [https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19690027073_1969027073.pdf Surveyor Program Results (PDF) 1969]

{{Lunar landers}}
{{Surveyor program}}
{{Orbital launches in 1967}}
{{NASA space program}}

[[Category:Surveyor program (NASA)|4]]
[[Category:Spacecraft launched in 1967]]
[[Category:Spacecraft launched by Atlas-Centaur rockets]]
[[Category:Spacecraft that impacted the Moon]]
[[Category:Missions to the Moon]]
[[Category:1967 on the Moon]]


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