Lunar_Orbiter_5
Lunar Orbiter 5
United States lunar space probe
Lunar Orbiter 5, the last of the "Lunar Orbiter series",[2] was designed to take additional Apollo and Surveyor landing site photography and to take broad survey images of unphotographed parts of the Moon's far side. It was also equipped to collect selenodetic, radiation intensity, and micrometeoroid impact data and was used to evaluate the Manned Space Flight Network tracking stations and Apollo Orbit Determination Program.
Image of the Earth taken by Lunar Orbiter 5, enhanced by LOIRP | |
| Mission type | Lunar orbiter |
|---|---|
| Operator | NASA |
| COSPAR ID | 1967-075A  |
| SATCAT no. | 2907 |
| Mission duration | 183 days |
| Spacecraft properties | |
| Manufacturer | Langley Research Center |
| Launch mass | 385.6 kilograms (850 lb)[1] |
| Start of mission | |
| Launch date | August 1, 1967, 22:32:00 (1967-08-01UTC22:32Z) UTC |
| Rocket | Atlas SLV-3 Agena-D |
| Launch site | Cape Canaveral LC-13 |
| End of mission | |
| Disposal | Deorbited |
| Decay date | January 31, 1968 (1968-02-01) |
| Orbital parameters | |
| Reference system | Selenocentric |
| Semi-major axis | 4,846.8 kilometers (3,011.7 mi) |
| Eccentricity | 0.26 |
| Periselene altitude | 194.5 kilometers (120.9 mi) |
| Aposelene altitude | 6,023 kilometers (3,743 mi) |
| Inclination | 85 degrees |
| Period | 510.08 minutes |
| Lunar orbiter | |
| Orbital insertion | August 5, 1967 |
| Impact site | 02.79°S 83.01°W / -02.79; -83.01 |
| Orbits | 1,380 |
None → | |
The spacecraft was placed in a cislunar trajectory and on August 5, 1967 was injected into an elliptical near polar lunar orbit 194.5 by 6,023 kilometres (120.9 mi × 3,742.5 mi) with an inclination of 85 degrees and a period of 8 hours 30 minutes. On August 7 the perilune was lowered to 100 kilometers (62 mi), and on August 9 the orbit was lowered to a 99-by-1,499-kilometer (62 mi × 931 mi), 3 hour 11 minute period.[3]
The spacecraft acquired photographic data from August 6 to 18, 1967, and readout occurred until August 27, 1967.[4] A total of 633 high resolution and 211 medium resolution frames at resolution down to 2 meters (6 ft 7 in) were acquired, bringing the cumulative photographic coverage by the five Lunar Orbiter craft to 99% of the Moon's surface.[5] Accurate data were acquired from all other experiments throughout the mission. The spacecraft was tracked until it struck the lunar surface on command[3] at 2.79 degrees S latitude, 83 degrees W longitude (selenographic coordinates) on January 31, 1968.
Features on the near side of the Moon that were photographic targets included Petavius, Hyginus, Messier, Tycho, Copernicus, Gassendi, Vitello, Mons Gruithuisen Gamma, Prinz, Aristarchus, Vallis Schroteri, Marius Hills, Montes Apenninus, Rimae Plato, Sinus Aestuum, Hipparchus, Rimae Sulpicius Gallus, Rimae Calippus, Censorinus, Dionysius, and the future landing site of Apollo 11.[6]
| Lunar Photographic Studies : | Evaluation of Apollo and Surveyor landing sites |
| Meteoroid Detectors : | Detection of micrometeoroids in the lunar environment |
| Caesium Iodide Dosimeters : | Radiation environment en route to and near the Moon |
| Selenodesy : | Gravitational field and physical properties of the Moon |
- "Lunar Orbiter 5". NASA's Solar System Exploration website. Retrieved November 30, 2022.
- "DESTINATION MOON: A history of the Lunar Orbiter Program". NASA. 1976. Retrieved November 12, 2022.
- "Lunar Orbiter 5 Description and Mission Summary". NASA. Retrieved November 13, 2022.
- "In depth: Lunar Orbiter 5". NASA. August 7, 2019. Retrieved November 13, 2022.
- Hansen, Thomas P. "Guide to Lunar Orbiter Photographs" (PDF). NASA. Retrieved November 13, 2022.