Table 3
Orbital elements of Peneius, the satellite of Daphne, expressed in EQJ2000, obtained with Genoid.
| Observing data set | ||
|---|---|---|
| Number of observations | 30 | |
| Time span (days) | 3783 | |
| rms (mas) | 8.3 | |
| Orbital elements EQJ2000 | ||
| P (day) | 1.137 446 | ±0.000 009 |
| a (km) | 463.5 | ±22.8 |
| e | 0.009 |  |
| i (°) | 128.1 | ±6.2 |
| Ω (°) | 272.7 | ±5.7 |
| ω (°) | 171.9 | ±37.6 |
| tp (JD) | 2454550.586985 | ±0.117331 |
| Derived parameters | ||
| M ( × 1018 kg) | 6.10 | ±0.89 |
| λp, βp (°) | 197, −33 | ±6, 7 |
| αp, δp (°) | 182, −38 | ±5, 7 |
| Λ (°) | 2 | ±4 |
Notes. The table lists: orbital period P, semi-major axis a, eccentricity e, inclination i, longitude of the ascending node Ω, argument of pericenter ω, time of pericentertp. The number of observations and rms between predicted and observed positions are also provided. Finally, we report the derived primary mass M, the ecliptic J2000 coordinates of the orbital pole (λp, βp), the equatorial J2000 coordinates of the orbital pole (αp, δp), and the orbital inclination (Λ) with respect to the equator of Daphne. Uncertainties are given at 3 σ.
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