Table 2.
Separation of NW and SE components with respect to the core.
| Epoch | ν | rNW | θNW | rSE | θSE | Ref. |
|---|---|---|---|---|---|---|
| (GHz) | (mas) | (°) | (mas) | (°) | ||
| 1981.9 | 5 | 2.5 ± 2.0 | −49.0 | 3.2 ± 2.0 | −225.0 | 1 |
| 1989.3 | 5 | 4.2 ± 1.0 | −48.4 | 4.1 ± 1.0 | −221.3 | 2 |
| 1992.2 | 5 | 5.0 ± 0.3 | −42.8 | 3.9 ± 0.3 | −223.1 | 2 |
| 1994.7 | 5 | 5.1 ± 0.3 | −46.8 | 3.7 ± 0.3 | −219.1 | 2 |
| 1995.2 | 8.4 | 5.6 ± 0.2 | −47.1 | 3.5 ± 0.3 | −218.0 | 3 |
| 1996.6 | 5 | 6.0 ± 0.3 | −46.9 | 3.3 ± 0.2 | −217.1 | 3 |
| 2007.5 | 8.4 | 8.2 ± 0.6 | −41.7 | 4.5 ± 0.2 | −219.0 | 3 |
| 2017.3 | 8.4 | 10.2 ± 0.6 | −42.0 | 5.0 ± 0.2 | −221.4 | 3 |
| 2017.6 | 8.6 | 10.2 ± 0.3 | −40.4 | 5.0 ± 0.2 | −220.1 | 3 |
Notes. Uncertainties are derived from the component size along the direction to the core, divided by a factor 5, except for the first two epochs: for 1981.9, in which the confusion is severe and the (u, v)-coverage sparse, we adopt an uncertainty of 2 mas, while for 1989.3, which has better quality and somewhat larger separation, we adopt 1 mas.
References. 1: Wrobel et al. (1985), 2: Taylor et al. (1998), and 3: this work.
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