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Table 3
Kinematic ages at epochs 1991-07-06 and 2012-09-05 together with an approximate distances for the epoch 2012-09-05 from the central source for the ballistic features of the jet.
| Feature | Age 1991 | Age 2012 | Distance | Method | Comments | |
|---|---|---|---|---|---|---|
| yr | yr | ″ | ||||
| North | BSHKM | 125–180 | 145–200 | 17 | direct | Stable expansion velocity over the last 50 yr, |
| μ = 0.″10 ± 0.″02 yr−1 | ||||||
| CSHKM | 286 ± 12 | 307 ± 12 | 35 | magnif. | Brightness variations. | |
| Structural changes in different wavelengths. | ||||||
| NE4 | 285 ± 61 | 306 ± 61 | 45 | magnif. | ||
| South | loop+S | 160 ± 40 | 183 ± 40 | 10 | magnif. | Loop expanding steadily at least since 1960s. |
| Significant brightness change of knot S. | ||||||
| SW3 | 215 ± 36 | 236 ± 36 | 45 | magnif. | ||
| SW4 | 880 ± 150 | 900 ± 150 | 75 | magnif. |
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