Table 2
Parameters of flux-weighted ellipses fitted to the maser cloudlets that appeared in all three epochs.
| Source(a) Distance (kpc) | Centre(a) | Semi-axes; PAmajor(b) | |
|---|---|---|---|
| ΔRA (mas) | ΔDec (mas) | (mas×mas; °) | |
| G23.207−00.377 | −55.817 | +81.207 | 128.33 × 40.07; −48 |
| 4.18(c) | −56.378 | +82.097 | 129.48 × 40.80; −48 |
| −56.573 | +82.302 | 129.74 × 40.90; −48 | |
| G23.389+00.185 | −39.045 | −74.610 | 101.84 × 51.41, +52 |
| 4.8(c) | −40.010 | −75.244 | 105.16 × 51.06; +52 |
| −40.023 | −75.514 | 105.10 × 51.18; +52 | |
| G23.657−00.127 | −66.058 | −96.411 | 134.89 × 123.94; −20 |
| 3.19(d) | −66.379 | −96.246 | 136.01 × 124.49; −19 |
| −66.824 | −97.350 | 136.06 × 125.27; −19 | |
| G28.817+00.365 | −47.443 | −14.272 | 61.53 × 26.47; +53 |
| 4.6(e) | −46.509 | −13.680 | 59.77 × 27.41; +53 |
| −46.429 | −13.658 | 59.65 × 27.61; +52 | |
| G31.047 +00.356(★) | −31.068 | −11.355 | 34.28 × 12.57; +63 |
| 4.9(e) | −30.665 | −10.780 | 33.54 × 14.04; +63 |
| −30.855 | −10.639 | 33.76 × 14.07; +64 | |
| G31.581+00.077 | +46.437 | +69.870 | 108.22 × 76.09; +87 |
| 5.5(c) | +46.626 | +69.040 | 108.18 × 74.62; +86 |
| +46.756 | +68.912 | 108.18 × 74.55; +86 | |
Notes. First-epoch fits are presented in Figs. 1–5. (a)The relative coordinates to the brightest spot position in each target in the first epoch as given in Table 1. (b) The position angle of the major axis (north to east). Distances were derived either through the trigonometric parallaxes, (c) Reid et al. (2019) and (d) Bartkiewicz et al. (2008), or the calculated near kinematic distances, (e) Reid et al. (2019); the online calculator is available at http://bessel.vlbi-astrometry.org/node/378.(★) The fitting was done to all maser spots visible at each epoch separately (Fig. A.1).
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