Table 2.
Absolute position of the reference maser feature.
| (1) | (2) | (3) | (4) | (6) | (7) | (8) | (9) | (10) | (11) | |
|---|---|---|---|---|---|---|---|---|---|---|
| Epoch | Reference | Vlsr | α2000 | εrms |
 |
Δα(a) | δ2000 |
 |
Δδ(a) | |
| maser | ||||||||||
| (km s−1) | (h : m : s) | (mas) | (mas) | (mas) | (s) | (° : ′: ″) | (mas) | (″) | ||
| 2014.46 | VLA1.1.15 | 10.45 | 20:38:36.43399 | 0.003 | 0.006 | ±0.9 | ±0.00008 | +42:37:34.8710 | 0.04 | ±0.0009 |
| 2016.45 | VLA1.2.07 | 10.92 | 20:38:36.43403 | 0.029 | 0.05 | ±1.2 | ±0.00011 | +42:37:34.8667 | 0.04 | ±0.0010 |
| 2018.44 | VLA1.3.04 | 8.63 | 20:38:36.43201 | 0.018 | 0.04 | ±0.9 | ±0.00008 | +42:37:34.8588 | 0.03 | ±0.0009 |
| 2020.82 | VLA1.4.05 | 9.87 | 20:38:36.43111 | 0.029 | 0.06 | ±1.0 | ±0.00009 | +42:37:34.8794 | 0.05 | ±0.0009 |
Notes.
The uncertainties of the absolute positions (Δα and Δδ) are obtained by adding quadratically the systematic errors (εsys = 0.028 mas), the errors due to the thermal noise (εrms), the Gaussian fit errors (εgauss), the position errors of the phase-reference source J2040+4527 (ΔαJ2040 = 0.68 mas and ΔδJ2040 = 0.80 mas), and half of the restoring beam of W75N(B) to account for the maser spots scatter of each maser features (see Table 1 and Sect. 2).
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