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Table 1
Parameters of Janus and Epimetheus (Jacobson et al. 2008; Thomas et al. 2013).
| Parameter | Unit | Epimetheus | Janus | ||
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| mass | m ♄ | m epi | 0.11667 × 10-8 | m jan | 0.58333 × 10-8 |
| escape velocity | m/s | 39 | v esc | 65 | |
| density | kg/m3 | ρ epi | 640 ± 62 | ρ jan | 630 ± 30 |
| mean radius | R 0 | 3.85 × 10-4 | 6.88 × 10-4 | ||
| semi-major axis | R 0 | a epi | 1.000172 | a jan | 0.999842 |
| eccentricity | e epi | 0.0097 | e jan | 0.0068 | |
Notes. m♄ is the mass of Saturn and R0 is the mean distance of Janus and Saturn.
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