| | Robot Planetary Explorers |
 | | After one month of mapping the orbit was rotated to a perilune of 29 degrees N latitude, where it remained for one more month. |
| | The objective of the mission was to test sensors and spacecraft components under extended exposure to the space environment and to make scientific observations of the Moon and the near-Earth asteroid 1620 Geographos. |
| | These observations were originally for the purposes of assessing the surface mineralogy of the Moon and Geographos, obtaining lunar altimetry from 60N to 60S latitude, and determining the size, shape, rotational characteristics, surface properties, and cratering statistics of Geographos. |
| www.astronautix.com /articles/roborers.htm (20626 words) |
