Table 3.
Summary of the different solutions for the orientation and spin parameters.
| Solution | Orientation at T = J2015.5 (mas) | Spin (mas yr−1) | ||||
|---|---|---|---|---|---|---|
| εX(T) | εY(T) | εZ(T) | ωX | ωY | ωZ | |
| A | −0.019 ± 0.032 | +1.304 ± 0.074 | +0.553 ± 0.026 | −0.068 ± 0.023 | −0.051 ± 0.027 | −0.014 ± 0.028 |
| B | – | – | – | −0.050 ± 0.036 | −0.139 ± 0.055 | +0.002 ± 0.038 |
| C | −0.001 ± 0.036 | +1.413 ± 0.085 | +0.559 ± 0.033 | −0.056 ± 0.028 | −0.057 ± 0.028 | −0.019 ± 0.035 |
| D | +0.026 ± 0.034 | +1.465 ± 0.079 | +0.629 ± 0.028 | −0.051 ± 0.025 | −0.066 ± 0.029 | −0.015 ± 0.030 |
| Adopted | −0.019 ± 0.158 | +1.304 ± 0.349 | +0.553 ± 0.135 | −0.068 ± 0.052 | −0.051 ± 0.045 | −0.014 ± 0.066 |
Notes. The table gives the estimated orientation and spin components for different solutions with their uncertainties (after ±). All solutions use the same subset of 26 sources, denoted as accepted in Table 2. Solution A is the baseline solution described in Sect. 3.3. Solutions B–D are the alternative solutions described in Sect. 3.4: B using only proper motions, C using only positions, and D using the same data as A and the magnitude dependent model in Eq. (31). The ‘Adopted’ solution is identical to A, but the uncertainties are estimated by bootstrap resampling of the 26 sources (while for A–D the uncertainties are formal values computed from the inverse normal matrix).
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