Table 3
Summary of the dynamical parameter determinations.
| Parameters | Sol. | Ref. | ∆ | σ |
|---|---|---|---|---|
| T (TDB) | August 25, 1989 | |||
| X (km) | 136840.855 | 136849.557 | −8.703 | 2.379 |
| Y (km) | −65847.864 | −65844.916 | −2.948 | 2.713 |
| Z (km) | −320611.661 | −320611.774 | 0.113 | 1.664 |
| Vx (ms−1) | −3620.576 | −3620.481 | −0.095 | 0.026 |
| Vy (ms−1) | −2231.892 | −2231.962 | 0.070 | 0.040 |
| Vz (ms−1) | −1086.935 | −1086.967 | 0.032 | 0.020 |
| GMs (km3 s−2) | 6836525.210 | 6836527.100 | −1.890 | 19.526 |
| J2 (10−6) | 3401.655 | 3408.429 | −6.773 | 1.850 |
| J4 (10−6) | −33.294 | −33.399 | 0.104 | 10.000 |
Notes. The X, Y and Z are the position vector centered at Neptune, and Vx, Vy, and Vz are Triton’s velocity vector. The values GMs, J2, and J4 are the GM of the Neptunian system and the second and fourth zonal harmonics in the Neptune gravitational field, respectively. The SOL. and REF. are the values from our solution results and from Jacobson (2009), and the triangle symbol, ∆, denotes the parameter value difference between the two values. The formal 1σ uncertainty of our solution is shown under σ.
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