| Acronym | Meaning |
 | HRDI | High Resolution Doppler Imager |
| TWTA | Travelling Wave Tube Amplifier |
| HJD | Helicentric Julian Date |
| ISM | InterStellar Medium |
| GSFC | Goddard Space Flight Center |
| STSCI | Space Telescope Science Institute |
| MPESS | Multiple Purpose Experiment Support Structure |
| MOTV | Manned Orbital Transfer Vehicle |
| HB | Horizontal Branch |
| ATSR | Along Track Scanning Radiometer |
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