Table 2
Formal uncertainties in 1/Q of Io and Jupiter.
| Dataset | Astrometry | 1σ [-] | Contribution astrometry | ||
|---|---|---|---|---|---|
| radio science + | observations [-] | 1/QJupiter | 1/QIo | 1/QJupiter | 1/QIo |
| No astrometry | 0 | 1.5 × 10−6 | 3.0 × 10−3 | — | _ |
| All astrometry | 14 454 | 7.3 × 10−7 | 1.9 × 10−3 | 100% | 100% |
| Classical astrometry | |||||
| All | 12 073 | 9.8 × 10−7 | 2.3 × 10−3 | 67% | 64% |
| Before 1960 | 2473 | 1.2 × 10−6 | 2.3 × 10−3 | 39% | 64% |
| After 1960 | 9600 | 1.3 × 10−6 | 2.8 × 10−3 | 26% | 18% |
| Mutual phenomena | 2043 | 1.3 × 10−6 | 2.9 × 10−3 | 26% | 9% |
| Ground-based radar | 22 | 1.3 × 10−6 | 2.8 × 10−3 | 26% | 18% |
| Stellar occultation | 5 | 1.4 × 10−6 | 2.9 × 10−3 | 13% | 9% |
| All Io observations | 3814 | 9.3 × 10−7 | 2.4 × 10−3 | 74% | 55% |
| Future astrometry | 4877 | 1.5 × 10−6 | 3.0 × 10−3 | − | − |
Notes. The formal uncertainties are obtained from radio science simulated data combined with various subsets of the astrometric observations. The relative contributions of each data subsets are also provided. They are expressed as fractions of the total improvement achieved by adding all astrometric observations to the radio science only solution.
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