| Acronym | Meaning |
| RCT | Radiometric Calibration Target |
| SAR | Search And Rescue / Synthetic Aperture Radar |
| PDE | Particle Dispersion Experiment |
| USMP | United States Microgravity Payload |
| COMPTEL | COMPton TELescope |
| RNGC | Revised New General Catalog |
| HRI | High Resolution Imager |
| LEM | Lunar Excursion Module |
| NASA | National Aeronautics And Space Administration |
| EGRET | Energetic Gamma Ray Experiment Telescope |