Table 2
Difference Δα* and Δδ in the absolute positions of seven stars when phase-referenced to two different primary calibrators.
| Name | Δα* | σΔα*,CRF | Δδ | σΔδ,CRF |
|---|---|---|---|---|
| UX Ari Aa | 0.33 | 0.34 | 1.18 | 0.46 |
| UX Ari Ab | 0.33 | 0.34 | 1.12 | 0.46 |
| HD 283447 Aa | −0.21 | 0.24 | −1.55 | 0.43 |
| HD 283447 Ab | −0.20 | 0.24 | −1.66 | 0.43 |
| CoKu HP Tau G2 | −0.45 | 0.14 | 0.12 | 0.24 |
| BH CVn | 0.63 | 0.21 | 1.45 | 0.33 |
| del Lib | 0.80 | 0.25 | −1.43 | 0.46 |
| AR Lac | 0.20 | 0.10 | −0.26 | 0.12 |
| SZ Psc | −0.29 | 0.38 | −0.49 | 0.86 |
| RMS | 0.47 | 0.26 | 1.08 | 0.47 |
Notes. Uncertainties σΔα*,CRF and σΔδ,CRF were derived from the coordinate uncertainties of the primary calibrators P 1 and P 2 as described in Sect. 3.2. The last line indicates the RMS of the quantities, where double stars (UXAri, HD283447) were accounted only once in the calculations. Units are in milliarcseconds.
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