40th Anniversary (1966),Lunar Orbiter 1 Launch - Aug 10, 1966

Yesterday on JPL's Space Calendar it was noted that August 10 th was the 40th anniversary of the Lunar Orbiter 1 Launch.
http://nssdc.gsfc.nasa.gov/nmc/tmp/1966-073A.html

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http://www2.jpl.nasa.gov/calendar/#0608
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# Aug 10 - Mercury Passes 2.2 Degrees From Venus # Aug 10 - Neptune at Opposition # Aug 10 - 40th Anniversary (1966), Lunar Orbiter 1 Launch # Aug 11 -Updated[Aug 09] JC-Sat 10/ Syracuse 3B Ariane 5 Launch # Aug 11 - Asteroid 46 Hestia Occults HIP 12349 (7.3 Magnitude Star) # Aug 11 - Asteroid 1998 DK36 Near-Earth Flyby (0.035 AU) # Aug 11 - Asteroid 1 Ceres Closest Approach To Earth (1.984 AU) # Aug 11-13 - East Coast Conference on Astronomical Imaging, Philadelphia, Pennsylvania Snip
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SMART-1 is due to crash into the Moon on 2 September, 2006.
Maybe you folks with large telescopes would like to check it out.
- LRK -

Larry Klaes passed this info.
- LRK -
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>From: "Glenn A. Walsh"
>Reply-To: History of Astronomy Discussion Group
>
>To: HASTRO-L@LISTSERV.WVU.EDU
>Subject: Re: [HASTRO-L] SMART-1--Lunar research opportunity
>Date: Thu, 10 Aug 2006 17:28:14 -0700
>
>Professor Francis G. Graham of Kent State University has also prepared
>a primer for those who would like to try to VISUALLY monitor the impact
>of the SMART-1 spacecraft on the Moon. Of course a fairly large
>telescope would be needed.
>
>Here is a link to the news release, regarding Profesor Graham's
>practical guide to viewing the SMART-1 impact, which includes a link to
>the actual document:
>
>
http://buhlplanetarium4.tripod.com/friendsofthezeiss/releases/NR-Smart1Impact.htm
>
>gaw
>
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Pittsburgh, July 18 - "On the evening of September 2, observers in the eastern half of North America with moderately large telescopes may get a chance to see the European SMART-1 spacecraft crash into the Moon," according to Friends of the Zeiss Steering Committee Member Francis G. Graham, who is Assistant Professor of Physics and Astronomy at Kent State University.

Professor Graham has prepared a practical guide for amateur observers who wish to try to watch the impact of Smart-1 on the Moon, which can be accessed at the following link:

< http://www.venustransit.pghfree.net/gcorner/ImpactMoon.htm >

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Thanks for looking up with me.


Larry Kellogg

Web Site: http://lkellogg.vttoth.com/LarryRussellKellogg/
BlogSpot: http://kelloggserialreports.blogspot.com/
RSS link: http://kelloggserialreports.blogspot.com/atom.xml
Newsltr.: https://news.altair.com/mailman/listinfo/lunar-update
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http://nssdc.gsfc.nasa.gov/nmc/tmp/1966-073A.html
Lunar Orbiter 1

NSSDC ID: 1966-073A
Image associated with mission
Other Names

* Lunar Orbiter-A
* 02394

Description

The Lunar Orbiter 1 spacecraft 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. The spacecraft was placed in an Earth parking orbit on 10 August 1966 at 19:31 UT and injected into a cislunar trajectory at 20:04 UT. 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.

Lunar Orbiter 1 was injected into an elliptical near-equatorial lunar orbit
92.1 hours after launch. The initial orbit was 189.1 km x 1866.8 km and had a period of 3 hours 37 minutes and an inclination of 12.2 degrees. On 21 August perilune was dropped to 58 km and on 25 August to 40.5 km. The spacecraft acquired photographic data from August 18 to 29, 1966, and readout occurred through September 14, 1966. A total of 42 high resolution and 187 medium resolution frames were taken and transmitted to Earth covering over 5 milliom square km of the Moon's surface, accomplishing about 75% of the intended mission, although a number of the early high-res photos showed severe smearing. It also took the first two pictures of the Earth ever from the distance of the Moon. Accurate data were acquired from all other experiments throughout the mission. Orbit tracking showed a slight "pear-shape" to 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 N latitude, 161 degrees E longitude (selenographic coordinates) on the Moon's far side on October 29, 1966 on its 577th orbit. The early end to the nominal one year mission was due to the small amount of remaining attitude control gas and other deteriorating conditions and was planned to avoid transmission interference with Lunar Orbiter 2.

Spacecraft and Subsystems

The main bus of the Lunar Orbiter had the general shape of a truncated cone,
1.65 meters tall and 1.5 meters in diameter at the base. The spacecraft was comprised of three decks supported by trusses and an arch. The equipment deck at the base of the craft held the battery, transponder, flight progammer, inertial reference unit (IRU), Canopus star tracker, command decoder, multiplex encoder, traveling wave tube amplifier (TWTA), and the photographic system. Four solar panels were mounted to extend out from this deck with a total span across of 3.72 meters. Also extending out from the base of the spacecraft were a high gain antenna on a 1.32 meter boom and a low gain antenna on a 2.08 meter boom. Above the equipment deck, the middle deck held the velocity control engine, propellant, oxidizer and pressurization tanks, Sun sensors, and micrometeoroid detectors. The third deck consisted of a heat shield to protect the spacecraft from the firing of the velocity control engine. The nozzle of the engine protruded through the center of the shield. Mounted on the perimeter of the top deck were four attitude control thrusters.

Power of 375 W was provided by the four solar arrays containing 10,856 n/p solar cells which would directly run the spacecraft and also charge the 12 amp-hr nickel-cadmium battery. The batteries were used during brief periods of occultation when no solar power was available. Propulsion for major maneuvers was provided by the gimballed velocity control engine, a hypergolic 100-pound-thrust Marquardt rocket motor. Three-axis stabilization and attitude control were provided by four one-lb nitrogen gas jets. Navigational knowledge was provided by five Sun sensors, Canopus star sensor, and the IRU equipped with internal gyros. Communications were via a 10 W transmitter and the directional 1 meter diameter high gain antenna for transmission of photographs and a 0.5 W transmitter and omnidirectional low gain antenna for other communications. Both antennas operated in S-band at 2295 MHz. Thermal control was maintained by a multilayer aluminized mylar and dacron thermal blanket which enshrouded the main bus, special paint, insulation, and small heaters.

Results of the Lunar Orbiter Program

The Lunar Orbiter program consisted of 5 Lunar Orbiters which returned photography of 99% of the surface of the Moon (near and far side) with resolution down to 1 meter. Altogether the Orbiters returned 2180 high resolution and 882 medium resolution frames. The micrometeoroid experiments recorded 22 impacts showing the average micrometeoroid flux near the Moon was about two orders of magnitude greater than in interplanetary space but slightly less than the near Earth environment. The radiation experiments confirmed that the design of Apollo hardware would protect the astronauts from average and greater-than-average short term exposure to solar particle events. The use of Lunar Orbiters for tracking to evaluate the Manned Space Flight Network tracking stations and Apollo Orbit Determination Program was successful, with three Lunar Orbiters (2, 3, and 5) being tracked simultaneously from August to October 1967. The Lunar Orbiters were all eventually commanded to crash on the Moon before their attitude control gas ran out so they would not present navigational or communications hazards to later Apollo flights. The Lunar Orbiter program was managed by NASA Langley Research Center and involved building and launching 5 spacecraft to the Moon at a total cost of $163 million.

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http://nssdc.gsfc.nasa.gov/planetary/lunar/lunarorb.html
Lunar Orbiter (1966 - 1967)

Five Lunar Orbiter missions were launched in 1966 through 1967 with the purpose of mapping the lunar surface before the Apollo landings. All five missions were successful, and 99% of the Moon was photographed with a resolution of 60 m or better. The first three missions were dedicated to imaging 20 potential lunar landing sites, selected based on Earth-based observations. These were flown at low inclination orbits. The fourth and fifth missions were devoted to broader scientific objectives and were flown in high altitude polar orbits. Lunar Orbiter 4 photographed the entire nearside and 95% of the farside, and Lunar Orbiter 5 completed the farside coverage and acquired medium (20 m) and high (2 m) resolution images of 36 pre-selected areas. The images at the top of the page show the Lunar Orbiter spacecraft with the high and medium resolution cameras at the center, and an image of the crater Tycho taken with the Lunar Orbiter 5 medium resolution camera.

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http://www.lpi.usra.edu/
Lunar and Planetary Institute

http://www.lpi.usra.edu/lunar_resources/
Gateway To The Moon

http://www.lpi.usra.edu/resources/mapcatalog/
Lunar Map Catalog

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WHAT THE MIND CAN CONCEIVE, AND BELIEVE, IT WILL ACHIEVE - LRK

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