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Table 1

Parameters of Janus and Epimetheus (Jacobson et al. 2008; Thomas et al. 2013).

Parameter Unit Epimetheus Janus

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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