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- Lunar_Orbiter_4 abstract "Lunar Orbiter 4 was an unmanned US spacecraft, part of the Lunar Orbiter Program, designed to orbit the Moon, after the three previous orbiters had completed the required needs for Apollo mapping and site selection. It was given a more general objective, to "perform a broad systematic photographic survey of lunar surface features in order to increase the scientific knowledge of their nature, origin, and processes, and to serve as a basis for selecting sites for more detailed scientific study by subsequent orbital and landing missions". It was also equipped to collect selenodetic, radiation intensity, and micrometeoroid impact data. The spacecraft was placed in a cislunar trajectory and injected into an elliptical near polar high lunar orbit for data acquisition. The orbit was 2,706 by 6,111 kilometres (1,681 mi × 3,797 mi) with an inclination of 85.5 degrees and a period of 12 hours.After initial photography on May 11, 1967 problems started occurring with the camera's thermal door, which was not responding well to commands to open and close. Fear that the door could become stuck in the closed position covering the camera lenses led to a decision to leave the door open. This required extra attitude control maneuvers on each orbit to prevent light leakage into the camera which would ruin the film. On May 13 it was discovered that light leakage was damaging some of the film, and the door was tested and partially closed. Some fogging of the lens was then suspected due to condensation resulting from the lower temperatures. Changes in the attitude raised the temperature of the camera and generally eliminated the fogging. Continuing problems with the readout drive mechanism starting and stopping beginning on May 20 resulted in a decision to terminate the photographic portion of the mission on May 26. Despite problems with the readout drive the entire film was read and transmitted. The spacecraft acquired photographic data from May 11 to 26, 1967, and readout occurred through June 1, 1967. The orbit was then lowered to gather orbital data for the upcoming Lunar Orbiter 5 mission.A total of 419 high-resolution and 127 medium-resolution frames were acquired, covering 99% of the Moon's near side at resolutions from 58 to 134 metres (190 to 440 ft). Accurate data was acquired from all other experiments throughout the mission. Radiation data showed increased dosages due to solar particle events producing low energy protons. The spacecraft was used for tracking until it struck the lunar surface due to the natural decay of the orbit no later than October 31, 1967, between 22–30 degrees W longitude.".
- Lunar_Orbiter_4 cosparId "1967-041A".
- Lunar_Orbiter_4 wikiPageExternalLink contents.htm.
- Lunar_Orbiter_4 wikiPageExternalLink ?4.
- Lunar_Orbiter_4 wikiPageID "885956".
- Lunar_Orbiter_4 wikiPageLength "5318".
- Lunar_Orbiter_4 wikiPageOutDegree "21".
- Lunar_Orbiter_4 wikiPageRevisionID "643314812".
- Lunar_Orbiter_4 wikiPageWikiLink Apollo_program.
- Lunar_Orbiter_4 wikiPageWikiLink Atlas-Agena.
- Lunar_Orbiter_4 wikiPageWikiLink Cape_Canaveral_Air_Force_Station.
- Lunar_Orbiter_4 wikiPageWikiLink Cape_Canaveral_Air_Force_Station_Launch_Complex_13.
- Lunar_Orbiter_4 wikiPageWikiLink Category:Lunar_Orbiter_program.
- Lunar_Orbiter_4 wikiPageWikiLink Category:Spacecraft_launched_in_1967.
- Lunar_Orbiter_4 wikiPageWikiLink Category:Spacecraft_that_impacted_the_Moon.
- Lunar_Orbiter_4 wikiPageWikiLink Category:Spacecraft_that_orbited_the_Moon.
- Lunar_Orbiter_4 wikiPageWikiLink Exploration_of_the_Moon.
- Lunar_Orbiter_4 wikiPageWikiLink Langley_Research_Center.
- Lunar_Orbiter_4 wikiPageWikiLink Lunar_Orbiter_5.
- Lunar_Orbiter_4 wikiPageWikiLink Lunar_Orbiter_Image_Recovery_Project.
- Lunar_Orbiter_4 wikiPageWikiLink Lunar_Orbiter_program.
- Lunar_Orbiter_4 wikiPageWikiLink Lunar_and_Planetary_Institute.
- Lunar_Orbiter_4 wikiPageWikiLink Lunar_orbit.
- Lunar_Orbiter_4 wikiPageWikiLink Moon.
- Lunar_Orbiter_4 wikiPageWikiLink NASA.
- Lunar_Orbiter_4 wikiPageWikiLink Orbit.
- Lunar_Orbiter_4 wikiPageWikiLink Project_Apollo.
- Lunar_Orbiter_4 wikiPageWikiLink Selenocentric_orbit.
- Lunar_Orbiter_4 wikiPageWikiLink Spacecraft.
- Lunar_Orbiter_4 wikiPageWikiLinkText "IV".
- Lunar_Orbiter_4 wikiPageWikiLinkText "Lunar Orbiter 4".
- Lunar_Orbiter_4 apsis "selene".
- Lunar_Orbiter_4 cosparId "1967".
- Lunar_Orbiter_4 decayDate "1967-10-06".
- Lunar_Orbiter_4 hasPhotoCollection Lunar_Orbiter_4.
- Lunar_Orbiter_4 interplanetary "--05-08".
- Lunar_Orbiter_4 lastContact "1967-07-17".
- Lunar_Orbiter_4 launchDate "--05-04".
- Lunar_Orbiter_4 launchRocket Atlas-Agena.
- Lunar_Orbiter_4 launchSite Cape_Canaveral_Air_Force_Station.
- Lunar_Orbiter_4 launchSite Cape_Canaveral_Air_Force_Station_Launch_Complex_13.
- Lunar_Orbiter_4 manufacturer Langley_Research_Center.
- Lunar_Orbiter_4 missionDuration "1.5552E7".
- Lunar_Orbiter_4 missionType "Lunar orbiter".
- Lunar_Orbiter_4 name "Lunar Orbiter 4".
- Lunar_Orbiter_4 operator NASA.
- Lunar_Orbiter_4 orbitEccentricity "0.28".
- Lunar_Orbiter_4 orbitInclination "85.5".
- Lunar_Orbiter_4 orbitPeriod "43260.0".
- Lunar_Orbiter_4 orbitReference Lunar_orbit.
- Lunar_Orbiter_4 orbitReference Selenocentric_orbit.
- Lunar_Orbiter_4 satcat "2772".
- Lunar_Orbiter_4 wikiPageUsesTemplate Template:Convert.
- Lunar_Orbiter_4 wikiPageUsesTemplate Template:Infobox_spaceflight.
- Lunar_Orbiter_4 wikiPageUsesTemplate Template:Lunar_Orbiter_program.
- Lunar_Orbiter_4 wikiPageUsesTemplate Template:Moon_spacecraft.
- Lunar_Orbiter_4 wikiPageUsesTemplate Template:NASA_space_program.
- Lunar_Orbiter_4 wikiPageUsesTemplate Template:No_epoch.
- Lunar_Orbiter_4 wikiPageUsesTemplate Template:Orbital_launches_in_1967.
- Lunar_Orbiter_4 wikiPageUsesTemplate Template:Use_American_English.
- Lunar_Orbiter_4 subject Category:Lunar_Orbiter_program.
- Lunar_Orbiter_4 subject Category:Spacecraft_launched_in_1967.
- Lunar_Orbiter_4 subject Category:Spacecraft_that_impacted_the_Moon.
- Lunar_Orbiter_4 subject Category:Spacecraft_that_orbited_the_Moon.
- Lunar_Orbiter_4 hypernym Spacecraft.
- Lunar_Orbiter_4 type ArtificialSatellite.
- Lunar_Orbiter_4 type CelestialBody.
- Lunar_Orbiter_4 type Place.
- Lunar_Orbiter_4 type Satellite.
- Lunar_Orbiter_4 type Mission.
- Lunar_Orbiter_4 type Probe.
- Lunar_Orbiter_4 type Program.
- Lunar_Orbiter_4 type Location.
- Lunar_Orbiter_4 type Place.
- Lunar_Orbiter_4 type Thing.
- Lunar_Orbiter_4 comment "Lunar Orbiter 4 was an unmanned US spacecraft, part of the Lunar Orbiter Program, designed to orbit the Moon, after the three previous orbiters had completed the required needs for Apollo mapping and site selection.".
- Lunar_Orbiter_4 label "Lunar Orbiter 4".
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- Lunar_Orbiter_4 sameAs Q1066381.
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- Lunar_Orbiter_4 wasDerivedFrom Lunar_Orbiter_4?oldid=643314812.
- Lunar_Orbiter_4 isPrimaryTopicOf Lunar_Orbiter_4.