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Table 2
Parameter details and constraints for Jupiter and Tianwen-4.
| Parameters | Estimation | Parameter details | A priori constraint |
|---|---|---|---|
| Jupiter | |||
| Initial state | Global | Translational state | Position: 1 km, velocity: 0.1 m/s |
| Gravitational parameter | Global | Gravitational parameter μ | None |
| Tesseral gravity coefficients | Global | C2,1, S2,1, C2,2, S2,2 | None |
| Zonal gravity coefficients | Global | J2 to J40 | J13 to J40 (Kaspi et al. 2023) |
| Rotation rate | Global | Constant rotation rate | None |
| Pole position | Global | Right ascension and declination | None |
| Tidal Love number k22 | Global | Separate effect of Galilean moons | Juno × 10 (Durante et al. 2020) |
| Tidal Love numbers k31, k33, k42, k44 | Global | Combined effect of Galilean moons | Juno × 10 (Durante et al. 2020) |
| Tianwen-4 primary | |||
| Initial state | Arc-wise | Translational state | Position: 1 km, velocity: 0.01 m/s |
| Empirical acceleration | Arc-wise | Constant in the RTN frame | 5 × 10−8 m/s2 |
| Radiation pressure coefficient | Global | Spacecraft radiation pressure | None |
| Tianwen-4 secondary | |||
| Initial state | Arc-wise | Translational state | Position: 1 km, velocity: 0.1 m/s |
| Empirical acceleration | Arc-wise | Constant in the RTN frame | 5 × 10−8 m/s2 |
| Radiation pressure coefficient | Global | Spacecraft radiation pressure | None |
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