| Acronym | Meaning |
 | IAPPP | International Amateur/Professional Photoelectric Photometry |
| GEM | Giotto Extended Mission |
| WTR | Western Test Range |
| KPNO | Kitt Peak National Observatory |
| PASS | Primary Avionics Software System |
| AAO | Anglo-Australian Observatory |
| MPEC | Multi-Purpose Experiment Canister |
| SEDS | Students For The Exploration And Development Of Space |
| SPAS | Space Pallet Satellite |
| EOSP | Earth Observing Scanning Polarimeter |
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