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Table 2
Priors for the purely astrometric model.
| Parameter | Distribution |
|---|---|
| Δα0 (mas) | Normal (0, 0.04) |
| Δδ0 (mas) | Normal (0, 0.04) |
| ϖ (mas) | Normal (2.8, 59); ϖ ≥ 0 |
| μα (mas yr−1) | Normal (0, 9.5 ϖ0.89) |
| μδ (mas yr−1) | Normal (0, 10 ϖ0.83) |
Notes. The parallax (ϖ) has the additional constraint that it must be non-negative. Proper motions have a parallax-dependent standard deviation. Distributionparameters as in Table 1.
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