Table 7.
Barycenter parameters for two versions of model Eq. (8), without (Δ = 0), and with separate offsets (Δ ≠ 0) in FORS2 and HST measurements, and the solution by Garcia et al. (2017).
| Parameter | No offset (Δ = 0) | Separate offset | Garcia 2017 | |
|---|---|---|---|---|
| value ±σfit | value ±σfit | σstat | value ±σ | |
| q | 0.8650 ± 0.0024 | 0.8519 ± 0.0024 | – | 0.82 ± 0.03 |
| xc (mas) | 24.371 ± 0.066 | 28.338 ± 0.063 | 1.332 | – |
| yc (mas) | 333.713 ± 0.097 | 330.146 ± 0.104 | 1.190 | – |
| μx (mas yr−1) | −2759.709 ± 0.045 | −2760.884 ± 0.077 | 0.384 | −2762 ± 2.5 |
| μy (mas yr−1) | 353.208 ± 0.053 | 354.753 ± 0.075 | 0.481 | 358 ± 3.5 |
| ρ (mas) | 37.582 ± 6.64 | 39.129 ± 6.29 | 6.29 | 38.06 ± 8 |
| ρA (mas) | 38.192 ± 9.31 | 39.802 ± 7.99 | 8.35 | – |
| ρB (mas) | 36.877 ± 11.58 | 38.339 ± 9.94 | 10.40 | – |
| d (mas) | −51.314 ± 5.64 | −52.199 ± 5.16 | 5.40 | −48.73 ± 7 |
| dA (mas) | −50.897 ± 7.66 | −51.554 ± 6.55 | 6.80 | – |
| dB (mas) | −51.796 ± 9.53 | −52.956 ± 8.15 | 8.51 | – |
| ϖ(mas) | 501.165 ± 0.055 | 501.215 ± 0.053 | 0.061 | 501.01 ± 0.51 |
| Δx (mas) | 0 | −0.095 ± 0.081 | 0.169 | – |
| Δy (mas) | 0 | +0.303 ± 0.080 | 0.197 | – |
| rms (mas) | 0.359 | 0.340 | – |
Notes. Zero-points xc, yc are derived with reference to α = 162.3107300∘, δ = −53.3181500∘, ICRF, epoch J2015.0, and the zero time is t0 = 56500 MJD. The precision σfit refers to the least-squares fit of the linear Eq. (8) with fixed q, while σstat takes into account statistical variations of q within ±0.0024.
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