| Acronym | Meaning |
 | PC | ParseC (usu. Pc) |
| JEM | Japanese Experiment Module |
| MACS | Modular Attitude Control System |
| MPC | Minor Planets Circular |
| CCSDS | Consultative Committee For Space Data Systems |
| UIT | Ultraviolet Imaging Telescope |
| DESAT | Desaturation |
| NASA | National Aeronautics And Space Administration |
| ACR | Active Cavity Radiometer |
| HR | Hertzsprung-Russell |
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