Table 3
Orbital elements of the satellites of Sylvia, expressed in EQJ2000, obtained with Genoid.
| Romulus | Remus | |||
|---|---|---|---|---|
| Observing data set | ||||
| Number of observations | 130 | 66 | ||
| Time span (days) | 6050 | 5656 | ||
| RMS (mas) | 9.85 | 8.24 | ||
| Orbital elements EQJ2000 | ||||
| P (day) | 3.64126 | ±0.00005 | 1.35699 | ±0.00075 |
| a (km) | 1340.6 | ±1.2 | 694.2 | ±0.4 |
| e | 0.000 |  |
0.005 |  |
| i (°) | 7.4 | ±1.6 | 8.7 | ±5.4 |
| Ω (°) | 97.1 | ±5.8 | 100.8 | ±20.6 |
| ω (°) | 171.0 | ±10.5 | 262.2 | ±25.9 |
| tp (JD) | 2455597.08689 | ±0.10085 | 2455594.89253 | ±0.10444 |
| Physical parameters | ||||
| MSylvia (×1019 kg) | 1.440 | ±0.004 | ||
| MRomulus (×1015 kg) | 1.4 | ±1.2 | ||
| MRemus (× 1014 kg) | 7.8 | ±7.3 | ||
| ΔmRomulus | 6.2 | ±1.1 | ||
| ΔmRemus | 7.1 | ±2.1 | ||
| Derived parameters | ||||
| λp, βp (°) | 73, +65 | ±4, 1 | 70, +64 | ±11, 3 |
| αp, δp (°) | 7, +83 | ±6, 2 | 11, +81 | ±21, 5 |
| Λ (°) | 5 | ±1 | 6 | ±4 |
 (km) |
15.1 | ±1.1 | ||
 (km) |
10.3 | ±2.1 | ||
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, and time of pericenter tp. The number of observations and RMS between predicted and observed positions are also provided. Finally, we report the mass of Sylvia MSylvia, the mass of Romulus MRomulus, the mass of Remus MRemus, their apparent magnitude difference Δm with Sylvia, 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 Sylvia. Uncertainties are given at 3-σ.
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