Open Access
Table 1
Construction steps of lunar reference systems and frames.
| Steps | Specific name | PA | ME |
|---|---|---|---|
| 1. Conception | Ideal reference system | Diagonal matrix inertia | Mean Earth direction |
| 2. Choice of a structure | Reference system | Undistorted moon | Gravity field, dissipation (Moon interior, tides) |
| 3. Structure modelling | Conventional reference system | GRAIL and ephemeris | GRAIL and ephemeris |
| 4. Materialisation | Conventional reference frame | LLR or future geodetic coordinates | LLR or future geodetic coordinates |
| 5. Extension and densification | Secondary reference frame | Using new devices or craters such as VLBI | Craters position (cartography) |
Notes. The PA and ME columns highlight the differences between these two frames. Step 4 could be improved in the future using geodetic technics such as Very Long Baseline Interferometry, VLBI or radio-tracking (Dehant et al. 2012).
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