Lunar Orbiter 1

Last updated

Lunar Orbiter 1
Lunar Orbiter Engineering Mock-up.jpg
Lunar Orbiter Engineering Mock-up
Mission typeLunar orbiter
Operator NASA
COSPAR ID 1966-073A OOjs UI icon edit-ltr-progressive.svg
SATCAT no. 2394
Mission duration80 days
Spacecraft properties
Manufacturer The Boeing Co.
Launch mass386.9 kg (853 lb) [1]
Start of mission
Launch dateAugust 10, 1966, 19:31 (1966-08-10UTC19:31) UTC [2]
Rocket Atlas SLV-3 Agena-D
Launch site Cape Canaveral LC-13
End of mission
DisposalDeorbited
Decay dateOctober 29, 1966 (1966-10-30) "about 13:29 GMT" [3]
Orbital parameters
Reference system Selenocentric
Semi-major axis 2,694 km (1,674 mi)
Eccentricity 0.33
Periselene altitude 189.1 to 40.5 km (117.5 to 25.2 mi)
Aposelene altitude 1,866.8 km (1,160.0 mi)
Inclination 12 degrees
Period 208.1 minutes
Lunar orbiter
Orbital insertionAugust 14, 1966
Impact site 6°21′N160°43′E / 6.35°N 160.72°E / 6.35; 160.72
Orbits577
 None
 

The 1966 Lunar Orbiter 1 robotic spacecraft mission, part of NASA's Lunar Orbiter program, [4] was the first American spacecraft to orbit the Moon. It was designed primarily to photograph smooth areas of the lunar surface for selection and verification of safe landing sites for the Surveyor and Apollo missions. It was also equipped to collect selenodetic, radiation intensity, and micrometeoroid impact data.

Contents

Mission summary

Mission controllers injected the spacecraft into a parking orbit around Earth on August 10, 1966, at 19:31 UTC. [5] The trans-lunar injection burn occurred at 20:04 UTC. The spacecraft experienced a temporary failure of the Canopus star tracker (probably due to stray sunlight) and overheating during its cruise to the Moon. The star tracker problem was resolved by navigating using the Moon as a reference, and the overheating was abated by orienting the spacecraft 36 degrees off-Sun to lower the temperature. [3]

Lunar Orbiter 1 was injected into an elliptical near-equatorial lunar orbit 92.1 hours after launch. The initial orbit was 189.1 by 1,866.8 kilometers (117.5 mi × 1,160.0 mi) and had a period of 3 hours 37 minutes and an inclination of 12.2 degrees. [5] On August 21, perilune was dropped to 58 km (36 mi) and on August 25 to 40.5 km (25.2 mi). The spacecraft acquired photographic data from August 18 to 29, 1966, and readout occurred through September 14, 1966.

Spacecraft orbit and photographic coverage on the near side (left) and far side (right) Lunar Orbiter 1 coverage.jpg
Spacecraft orbit and photographic coverage on the near side (left) and far side (right)

A total of 42 high-resolution and 187 medium-resolution frames were taken and transmitted to Earth covering more than 5 million square kilometers of the Moon's surface, accomplishing about 75% of the intended mission, although a number of the early high-resolution photos showed severe smearing. It also took the first two pictures of Earth from the Moon. [6] Accurate data were acquired from all other experiments throughout the mission. [7]

While not disclosed until after the end of the Cold War, the imaging system on the Lunar Orbiter spacecraft were the same Eastman Kodak cameras developed by the National Reconnaissance Office (NRO) for the SAMOS reconnaissance satellites. [8] NASA extended the camera innovation further by developing the film onboard the spacecraft and then scanning the photos for transmission via a video signal. [9]

Orbit tracking showed a slight "pear-shape" of the Moon based on the gravity field, and no micrometeorite impacts were detected. The spacecraft was tracked until it impacted the lunar surface on command at 7 degrees north latitude, 161 degrees east longitude (selenographic coordinates) on the Moon's far side on October 29, 1966, on its 577th orbit. [5] The early end of the nominal one-year mission resulted from a shortage of remaining attitude control gas and other deteriorating conditions and was planned to avoid transmission interference with Lunar Orbiter 2. [5]

Instruments
Imaging SystemEvaluation of Apollo and Surveyor landing sites
Meteoroid DetectorsDetection of micrometeoroids in the lunar environment
Caesium Iodide DosimetersRadiation environment en route to and near the Moon
SelenodesyGravitational field and physical properties of the Moon

See also

Related Research Articles

<span class="mw-page-title-main">Surveyor 3</span> American lunar lander

Surveyor 3 was the third lander of the American uncrewed Surveyor program sent to explore the surface of the Moon in 1967. It was the first mission to carry a surface-soil sampling-scoop.

<i>Clementine</i> (spacecraft) American space project

Clementine was a joint space project between the Ballistic Missile Defense Organization and NASA, launched on January 25, 1994. Its objective was to test sensors and spacecraft components in long-term exposure to space and to make scientific observations of both the Moon and the near-Earth asteroid 1620 Geographos.

<span class="mw-page-title-main">Luna programme</span> Robotic spacecraft missions to the Moon by the Soviet Union (1958–1976)

The Luna programme, occasionally called Lunik by western media, was a series of robotic spacecraft missions sent to the Moon by the Soviet Union between 1959 and 1976. 29 were failures and 15 were successful, each designed as either an orbiter or lander, and accomplished many firsts in space exploration. They also performed many experiments, studying the Moon's chemical composition, gravity, temperature, and radiation.

<span class="mw-page-title-main">Luna 11</span>

Luna 11 was an uncrewed space mission of the Soviet Union's Luna program. It was also called Lunik 11. Luna 11 was launched towards the Moon from an Earth-orbiting platform and entered lunar orbit on 27 August 1966.

Luna 12 was an unmanned space mission of the Luna program, also called Lunik 12.

<i>Luna 17</i> 1970 Soviet uncrewed lunar mission

LOK Luna 17 was an uncrewed space mission of the Luna program, also called Lunik 17. It deployed the first robotic rover onto the surface of the Moon.

<span class="mw-page-title-main">Lunar Orbiter program</span> Series of five uncrewed lunar orbiter missions

The Lunar Orbiter program was a series of five uncrewed lunar orbiter missions launched by the United States from 1966 through 1967. Intended to help select Apollo landing sites by mapping the Moon's surface, they provided the first photographs from lunar orbit and photographed both the Moon and Earth.

<span class="mw-page-title-main">Surveyor 2</span> Failed lunar lander launched in 1966

Surveyor 2 was to be the second lunar lander in the uncrewed American Surveyor program to explore the Moon. It was launched September 20, 1966 from Cape Kennedy, Florida aboard an Atlas-Centaur rocket. A mid-course correction failure resulted in the spacecraft losing control. Contact was lost with the spacecraft at 9:35 UTC, September 22.

<span class="mw-page-title-main">Chang'e 1</span> Chinese lunar probe launched in 2007

Chang'e 1 was an uncrewed Chinese lunar-orbiting spacecraft, part of the first phase of the Chinese Lunar Exploration Program. The spacecraft was named after the Chinese Moon goddess, Chang'e.

<span class="mw-page-title-main">SELENE</span> Japanese lunar orbiter spacecraft

SELENE, better known in Japan by its nickname Kaguya (かぐや), was the second Japanese lunar orbiter spacecraft following the Hiten probe. Produced by the Institute of Space and Astronautical Science (ISAS) and the National Space Development Agency (NASDA), the spacecraft was launched on September 14, 2007. After successfully orbiting the Moon for a year and eight months, the main orbiter was instructed to impact on the lunar surface near the crater Gill on June 10, 2009.

The 1966 Lunar Orbiter 2 robotic spacecraft mission, part of the Lunar Orbiter Program, was designed primarily to photograph smooth areas of the lunar surface for selection and verification of safe landing sites for the Surveyor and Apollo missions. It was also equipped to collect selenodetic, radiation intensity, and micrometeoroid impact data.

<span class="mw-page-title-main">Lunar Orbiter 3</span> United States lunar space probe

The Lunar Orbiter 3 was a spacecraft launched by NASA in 1967 as part of the Lunar Orbiter Program. It was designed primarily to photograph areas of the lunar surface for confirmation of safe landing sites for the Surveyor and Apollo missions. It was also equipped to collect selenodetic, radiation intensity, and micrometeoroid impact data.

<span class="mw-page-title-main">Lunar Orbiter 4</span> United States lunar probe

Lunar Orbiter 4 was a robotic U.S. 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.

<span class="mw-page-title-main">Lunar Orbiter 5</span> United States lunar space probe

Lunar Orbiter 5, the last of the "Lunar Orbiter series", 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.

<span class="mw-page-title-main">Chandrayaan-1</span> First lunar orbiter of Indias Chandrayaan Programme

Chandrayaan-1 was the first Indian lunar probe under the Chandrayaan programme. It was launched by the Indian Space Research Organisation (ISRO) in October 2008, and operated until August 2009. The mission included an orbiter and an impactor. India launched the spacecraft using a PSLV-XL rocket on 22 October 2008 at 00:52 UTC from Satish Dhawan Space Centre, at Sriharikota, Andhra Pradesh. The mission was a major boost to India's space program, as India researched and developed indigenous technology to explore the Moon. The vehicle was inserted into lunar orbit on 8 November 2008.

<span class="mw-page-title-main">Moon landing</span> Arrival of a spacecraft on the Moons surface

A Moon landing or lunar landing is the arrival of a spacecraft on the surface of the Moon. This includes both crewed and robotic missions. The first human-made object to touch the Moon was the Soviet Union's Luna 2, on 13 September 1959.

<span class="mw-page-title-main">Lunar Reconnaissance Orbiter</span> NASA robotic spacecraft orbiting the Moon

The Lunar Reconnaissance Orbiter (LRO) is a NASA robotic spacecraft currently orbiting the Moon in an eccentric polar mapping orbit. Data collected by LRO have been described as essential for planning NASA's future human and robotic missions to the Moon. Its detailed mapping program is identifying safe landing sites, locating potential resources on the Moon, characterizing the radiation environment, and demonstrating new technologies.

<span class="mw-page-title-main">Chang'e 2</span> Chinese Moon orbiter

Chang'e 2 is a Chinese uncrewed lunar probe that was launched on 1 October 2010. It was a follow-up to the Chang'e 1 lunar probe, which was launched in 2007. Chang'e 2 was part of the first phase of the Chinese Lunar Exploration Program, and conducted research from a 100-km-high lunar orbit in preparation for the December 2013 soft landing by the Chang'e 3 lander and rover. Chang'e 2 was similar in design to Chang'e 1, although it featured some technical improvements, including a more advanced onboard camera. Like its predecessor, the probe was named after Chang'e, an ancient Chinese moon goddess.

<i>Beresheet</i> Failed Israeli lunar lander

Beresheet was a demonstrator of a small robotic lunar lander and lunar probe operated by SpaceIL and Israel Aerospace Industries. Its aims included inspiring youth and promoting careers in science, technology, engineering, and mathematics (STEM), and landing its magnetometer, time capsule, and laser retroreflector on the Moon. The lander's gyroscopes failed on 11 April 2019 causing the main engine to shut off, which resulted in the lander crashing on the Moon. Its final resting position is 32.5956°N, 19.3496°E.

References

  1. Siddiqi, Asif (2018). Beyond Earth: A Chronicle of Deep Space Exploration, 1958–2016 (PDF) (second ed.). NASA History Program Office.
  2. Lunar Orbiter I: Extended Mission Spacecraft Subsystem Performance (PDF) (Report). NASA. The Boeing Company. September 1967. p. 37. NASA CR-870.
  3. 1 2 "Lunar Orbiter 1: America's First Lunar Satellite". Drew Ex Machina. 14 August 2016. Retrieved November 13, 2022.
  4. "Destination Moon: A history of the Lunar Orbiter Program". NASA. 1976. Retrieved November 12, 2022.
  5. 1 2 3 4 "In Depth: Lunar Orbiter 1". NASA. September 12, 2019. Retrieved November 13, 2022.
  6. "Lunar Orbiter Photo Gallery - Mission 1". Lunar and Planetary Institute . Retrieved November 13, 2022.
  7. Hansen, Thomas P. "Guide to Lunar Orbiter Photographs" (PDF). NASA. Retrieved November 13, 2022.
  8. Hall, R. Cargill (October 2001). "SAMOS to the Moon: The Clandestine Transfer of Reconnaissance Technology Between Government Agencies" (PDF). National Reconnaissance Office. Retrieved November 13, 2022.
  9. Kelvey, Jon (August 10, 2021). "Lunar Orbiter 1: One "Ingenious" Invention Changed Space Exploration Forever". Inverse. Retrieved November 13, 2022.