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Table 4
Fourier series of the oscillations in the τ angle of Phobos with respect to the ESAPHO reference frame.
| j | Arg. | Freq (rad/days) | Per (days) | Amp (deg) | Phase (deg) |
|
|
|||||
| 1 | ℓ | 19.6945 | 0.3190 | 1.0998 | 9.25 |
| 2 | 2ℓ | 39.3889 | 0.1595 | 0.0087 | 198.54 |
| 3 | ℓ ′ | 0.0091 | 687.1178 | 0.0057 | 198.11 |
| 4 | 2D − ℓ | 19.6914 | 0.3191 | 0.0050 | 153.38 |
| 5 | ψ − ϖ∗′ − D − ℓ′ | 13.5778 | 0.4628 | 0.0039 | 136.90 |
| 6 | ψ + D − F + 2ℓ′ | 0.0015 | 4082.2149 | 0.0038 | –34.40 |
| 7 | F | 19.7097 | 0.3188 | 0.0036 | –45.12 |
| 8 | 2ϖ∗′ + 2ℓ′ | 0.0183 | 343.4840 | 0.0032 | –3.42 |
| 9 | 2ϖ∗′ + D | 0.0076 | 826.2817 | 0.0018 | 234.00 |
| 10 | 2ψ − 2ϖ∗′ − 2D + F + ℓ − 2ℓ′ | 12.2484 | 0.5130 | 0.0014 | 38.06 |
Notes. The lower bound amplitude of 0.0014 deg corresponds to a displacement of 0.32 m at the surface of Phobos by taking the longest radius equal to 13.0 km. The series are in sine.
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