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Table 7
Epoch-average of Gaussian model parameters.
| Parameter | Epoch range | |||
| Before June 1997 | June 1997–June 2001 | After June 2001 | All data | |
|
|
||||
| 1.7 GHz | ||||
| Δα (mas) | – | 0.64 ± 0.12 | 0.68 ± 0.26 | 0.65 ± 0.18 |
| Δδ (mas) | – | −0.01 ± 0.05 | −0.08 ± 0.02 | −0.04 ± 0.05 |
| PA (deg) | – | 60.8 ± 1.8 | 68.8 ± 3.8 | 64.7 ± 4.9 |
| Major (mas) | – | 2.29 ± 0.09 | 2.18 ± 0.11 | 2.24 ± 0.11 |
| Minor (mas) | – | 0.94 ± 0.12 | 1.02 ± 0.21 | 0.98 ± 0.18 |
|
|
||||
| 2.3 GHz | ||||
| Δα (mas) | 0.45 ± 0.05 | 0.43 ± 0.03 | – | 0.44 ± 0.02 |
| Δδ (mas) | 0.24 ± 0.05 | 0.09 ± 0.17 | – | 0.16 ± 0.15 |
| PA (deg) | 62.7 ± 4.0 | 60.9 ± 5.3 | – | 61.5 ± 4.4 |
| Major (mas) | 1.03 ± 0.10 | 1.92 ± 0.07 | – | 1.62 ± 0.42 |
| Minor (mas) | 0.5 ± 0.3 | 0.5 ± 0.3 | – | 0.51 ± 0.24 |
|
|
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| 5.0 GHz | ||||
| Δα (mas) | 0.09 ± 0.05 | 0.09 ± 0.07 | −0.00 ± 0.28 | 0.08 ± 0.10 |
| Δδ (mas) | 0.02 ± 0.06 | −0.05 ± 0.11 | −0.17 ± 0.19 | −0.02 ± 0.11 |
| PA (deg) | 53 ± 12 | 63.4 ± 6.2 | 65.2 ± 4.5 | 60.9 ± 9.5 |
| Major (mas) | 0.82 ± 0.29 | 0.93 ± 0.11 | 0.94 ± 0.14 | 0.90 ± 0.19 |
| Minor (mas) | 0.28 ± 0.15 | 0.33 ± 0.06 | 0.28 ± 0.03 | 0.30 ± 0.09 |
|
|
||||
| 8.4 GHz | ||||
| Δα (mas) | −0.06 ± 0.06 | −0.06 ± 0.07 | – | −0.06 ± 0.06 |
| Δδ (mas) | −0.07 ± 0.05 | −0.06 ± 0.04 | – | −0.07 ± 0.05 |
| PA (deg) | 49.5 ± 6.5 | 58.5 ± 5.7 | – | 52.7 ± 7.6 |
| Major (mas) | 0.46 ± 0.08 | 0.58 ± 0.13 | – | 0.50 ± 0.12 |
| Minor (mas) | 0.15 ± 0.07 | 0.19 ± 0.04 | – | 0.17 ± 0.06 |
Notes. The shifts in right ascension (Δα) and declination (Δδ) refer to the coordinates given in Sect. 4.2. PA is the position angle of the core Gaussian (north through east direction). Major and Minor are the lengths of the Gaussian major and minor axes, respectively.
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