| Acronym | Meaning |
 | SPAS | Space Pallet Satellite |
| PPM | Positions And Proper Motions (catalog) |
| PDS | Planetary Data System |
| NOAO | National Optical Astronomy Observatories |
| OSCAR | Orbiting Satellite Carrying Amateur Radio |
| OSTP | Office Of Science And Technology Policy |
| ISAS | Institute Of Space AND Astronautical Science |
| INTELSAT | International Telecommunications Satellite |
| NASDA | NAtional Space Development Agency |
| HRSR | High-Resolution Scanning Radiometer |
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