New determinations of far-side lunar radii from Apollo photography

Computer Science

Scientific paper

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Apollo 16 Flight, Lunar Far Side, Lunar Topography, Photogrammetry, Size Determination, Thematic Mapping, Error Analysis, Lunar Photographs, Radii, Moon, Apollo 16, Topography, Moscoviense, Mare, Maps, Basins, Altimetry, Farside, Apollo 17, Reduction, Riemann, Surface, Lunar, Szilard, Fabry

Scientific paper

Determinations of far side lunar radii based on the reduction of photogrammetric measurements derived from Apollo 16 photographs obtained during the trans-earth phase of the spacecraft trajectory are presented. Reduction is accomplished by determining the Apollo 16 metric camera orientation relative to control points on the lunar surface whose coordinates are known exactly, than charting the surface on the basis of data coverage. The positions of 66 surface features in the area between longitudes 90 and 130 deg E and 10 and 60 deg N relative to the center of mass of the moon, with a relative accuracy of 500 km, are presented. A topographical map which can resolve basin-sized features has been derived from radius determinations. It is found that the craters Fabry, Riemann and Szilard comprise a topographically depressed region about 500 km in diameter with a floor 2.4 to 3.4 km below the 1730.0 km reference sphere and 4.8 to 5.8 km below the northern rim of the unfilled basin.

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