Table 7
Estimated forced libration in longitude of Phobos.
| Reference | A (deg) |
|---|---|
| Duxbury (1974) | 3. |
| Duxbury & Callahan (1989) | 0.81 ± 0.5 |
| Borderies & Yoder (1990) | 1.19 |
| Jacobson (2010) | 1.03 ± 0.22 |
| Willner et al. (2010) | 1.20 ± 0.14 |
| Willner et al. (2014) | 1.14 |
| Burmeister et al. (2018) | 1.14 ± 0.03 |
| Present work (1σ) | 1.09 ± 0.01 |
Notes. Duxbury (1974), Duxbury & Callahan (1989), Willner et al. (2010), and Burmeister et al. (2018) used spacecraft imaging to solve directly for the physical libration of Phobos. Borderies & Yoder (1990) and Willner et al. (2014) computed the libration of Phobos from the observed shape of Phobos assuming a homogeneous interior. Here, we follow Jacobson (2010) and determined the physical libration of Phobos from its effect on the Phobos orbit.
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