Open Access
Table 1
Nominal Earth–Moon and Mars–Phobos system parameters and integration settings.
| Parameter | Symbol | Unit | Earth | Moon | Mars | Phobos |
|---|---|---|---|---|---|---|
| Gravitational parameter | μ | m3 kg−1 s−2 | 3.986 ∙ 1014 | 4.903 ∙ 1012 | 4.283 ∙ 1013 | 7.112 · 105 |
| Unnormalised coefficients | C20 | – | −4.84 ∙ 10−4 | −9.09 ∙ 10-5 | −8.75 ∙ 10-4 | −2.92 ∙ 10−2 |
| C22 | – | 2.44 ∙ 10−6 | 3.47 • 10−5 | −8.46 ∙ 10−5 | 1.57 ∙ 10−2 | |
| S22 | – | 0.0 | 0.0 | 0.0 | 0.0 | |
| Radius | R | km | 6378.1 | 1737.4 | 3389.5 | 12.22 |
| Relaxation times | τ | s | 182 664 | 81 729 100 | 1 778 080 | 12 485 500 |
| τe | s | 58 050 | 13 692 502 | 222 641 | 162 229 | |
| Equivalent tidal parameters | k2 | – | 0.3 | 0.024059 | 0.152 | 1.3 ∙ 10−4 |
| Q | – | 12 | 37.5 | 79.91 | 37.5 | |
| Expected libration amplitude |  |
deg | – | 4.9 ∙ 10−3 | – | 0.43 |
| Libration - eccentricity ratio |  |
– | – | 1.4 ∙ 10−3 | – | 0.51 |
| Integrator type | – | – | Dormand-Prince integrator of order 8 | |||
| Integration time step | – | s | 5400 | 5400 | 60 | 60 |
| Propagation time | – | days | 10 000 | 120 000 | 3200 | 3200 |
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