| Acronym | Meaning |
| LN2 | Liquid Nitrogen |
| U3P | Union Pour La Promotion De La Propulsion Photonique |
| ADS | Astrophysical Data System (at Havard-Smithsonian CfA) |
| APL | Applied Physics Laboratory (at Johns Hopkins) |
| PDRS | Payload Deployment And Retrieval System |
| NSO | National Solar Observatory |
| ROSAT | ROentgen Satellite |
| GTO | Geostationary Transfer Orbit |
| GNC | Guidance |
| TCM | Trajectory Control Maneuver |