Table 4.
Formal improvement in the determination of orientation and spin parameters expected from the addition of new positional VLBI data for the 26 sources in the baseline subsample.
| Gaia data | Added VLBI data | σ[ε(T)] | σ[ω] |
|---|---|---|---|
| (σpos = 0.1 mas) | (μas) | (μas yr−1) | |
| DR2 (T = 2015.5) | None | 48.9 | 26.1 |
| – ” – | t = 2020 | 25.3 | 21.8 |
| – ” – | t = 2025 | 26.7 | 21.3 |
| – ” – | t = 2030 | 27.8 | 21.2 |
| 5 yr (T = 2017.1) | None | 49.6 | 9.6 |
| – ” – | t = 2020 | 22.1 | 7.0 |
| – ” – | t = 2025 | 22.9 | 5.8 |
| – ” – | t = 2030 | 23.7 | 5.3 |
| 10 yr (T = 2019.6) | None | 57.0 | 6.9 |
| – ” – | t = 2020 | 22.5 | 4.6 |
| – ” – | t = 2025 | 21.0 | 3.6 |
| – ” – | t = 2030 | 21.7 | 2.9 |
Notes. T is the reference epoch used in the solution; t is the epoch of the added VLBI observations. The last two columns give the formal uncertainties in ε(T) and ω, calculated as the quadratic means of the uncertainties in the X, Y, and Z components. The top entry (DR2 without added VLBI data) corresponds to solution A in Table 3.
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