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  • 1
    Publication Date: 2005-11-30
    Description: A preliminary comparison of Surveyor 3 and Apollo 12 photographs of areas disturbed by the Surveyor is described. About 60 Surveyor pictures taken in April and May 1967 and 20 Apollo photographs including stereo pairs were examined in detail. Only one definite change in the surface, other than those produced by astronauts, was noted. This is a particle about 2 mm in diameter which appears in the Apollo photographs of a Surveyor footpad imprint but which does not appear in the Surveyor photographs. The walls made by Surveyor footpads and surface sampler were still in place, and surface areas darkened by ejected fines during the Surveyor landing still appeared dark. The absence of detectable craters in the footpad imprint implies a very low micrometeorite flux on the lunar surface.
    Keywords: SPACE SCIENCES
    Type: NASA, Washington Analysis of Surveyor 3 Mater. and Phot. Returned by Apollo 12; p 173-176
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  • 2
    Publication Date: 2005-11-30
    Description: It is shown that the discoloration pattern of the Surveyor 3 camera provides evidence that the camera surface was whitened by the impact of particles blown from the lunar surface by the exhaust of the lunar module as it landed. It also indicates the velocity and direction at which these particles were ejected.
    Keywords: SPACE SCIENCES
    Type: NASA, Washington Analysis of Surveyor 3 Mater. and Phot. Returned by Apollo 12; p 94-96
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  • 3
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    In:  Other Sources
    Publication Date: 2011-08-16
    Description: Demonstration that lunar soil deforms and cracks in the same manner as homogeneous isotropic terrestrial soil s of moderate bulk density with a small amount of cohesion. This conclusion is made from an analysis of Surveyor 3 TV pictures and of Apollo 11 closeup picture of lunar surface disturbances by bearing tests and instrument pressure.
    Keywords: SPACE SCIENCES
    Type: Nature; 234; Dec. 17
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  • 4
    Publication Date: 2011-08-16
    Description: Surveyor program results, discussing lunar craters, rock fragments, particle size optical, thermal and radar characteristics and chemical composition
    Keywords: SPACE SCIENCES
    Type: ; ACE(
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  • 5
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    Publication Date: 2011-08-16
    Description: Surveyor 3 spacecraft TV camera surface discoloration patterns caused by lunar soil blown by Apollo 12 exhaust
    Keywords: SPACE SCIENCES
    Type: ; BROTECHNIKA, NO. 1(
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  • 6
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    Publication Date: 2011-08-16
    Description: Low micrometeoroid flux on lunar surface from comparative Surveyor 3 and Apollo 12 pictures
    Keywords: SPACE SCIENCES
    Type: ; ADEMIE DES SCIENCES
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  • 7
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    Publication Date: 2011-08-16
    Description: Bearing load vs penetration curves have been measured on a 1.3 g sample of lunar soil from the scoop of the Surveyor 3 soil mechanics surface sampler, using a circular indentor 2 mm in diameter. Measurements were made in an Earth laboratory, in air. This sample provided a unique opportunity to evaluate earlier, remotely controlled, in-situ measurements of lunar surface bearing properties. Bearing capacity, measured at a penetration equal to the indentor diameter, varied from 0.02-0.04 N/sq cm at bulk densities of 1.15 g/cu cm to 30-100 N/sq cm at 1.9 g/cu cm. Deformation was by compression directly below the indentor at bulk densities below 1.61 g/cu cm, by outward displacement at bulk densities over 1.62 g/cu cm. Preliminary comparison of in-situ remote measurements with those on returned material indicates good agreement if the lunar regolith at Surveyor 3 has a bulk density of 1.6 g/cu cm at 2.5 cm depth.
    Keywords: SPACE SCIENCES
    Type: The Moon; 3; Dec. 197
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  • 8
    Publication Date: 2011-08-16
    Description: Measurements of particle size distribution in Apollo 12 sample 12029-8 in the laboratory and in Surveyor 3 scoop material by remote photometry. A table is compiled to summarize the data obtained by various authors from all Surveyor missions.
    Keywords: SPACE SCIENCES
    Type: Nature Physical Science; 241; Jan. 15
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  • 9
    Publication Date: 2019-06-27
    Description: Science objectives and properties to be measured are outlined for long surface traverse missions on Mars and the Moon, with remotely-controlled roving vehicles. A series of candidate rover payloads is proposed for each planet, varying in weight, cost, purpose, and development needed. The smallest weighs 35 kg; the largest almost 300 kg. A high degree of internal control will be needed on the Mars rover, including the ability to carry out complex science sequences. Decision-making by humans in the Mars mission includes supervisory control of rover operations and selection of features and samples of geological and biological interest. For the lunar mission, less control on the rover and more on earth is appropriate. Science portions of the rover mission profile are outlined, with timelines and mileage breakdowns. Operational problem areas for Mars include control, communications, data storage, night operations, and the mission operations system. For the moon, science data storage on the rover would be unnecessary and control much simpler.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-136810
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  • 10
    Publication Date: 2019-06-27
    Description: A first-phase, perturbation analysis is presented for the tracking requirements necessary for the measurement of the second-order redshift in a heliocentric probe experiment. The clock performance required for such an experiment is also investigated.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-138112 , SAO-310-057
    Format: application/pdf
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