Table 1.
Observational details.
| Array – | ν | Project | Observation | Epoch | Integr. | Restoring | Position | rms (a) | Participating |
|---|---|---|---|---|---|---|---|---|---|
| Band | code | date | time | beam size | angle | stations (c) | |||
| (GHz) | 2018. | (h) | (mas × mas) | (°) |
 |
||||
| VLBA-L | 1.6 | BT 142 | 11 Feb. 2018 | 11 | 2.5 | 13.0 × 5.2 | −14 | 0.029 | Br, Fd, Hn, Kp, La, |
| Mk, Nl, Ov, Pt, (Sc) | |||||||||
| VLBA-K | 22 | BT 142 | 26 Feb. 2018 | 16 | 2.5 | 1.2 × 1.0 | 7.46 | 3.02(b) | Br, Fd, (Hn), Kp, La, |
| 0.064 | Mk, Nl, Ov, Pt, (Sc) | ||||||||
| EVN-C | 5.0 | ET 038 | 25 May 2018 | 39 | 1.4 | 5.3 × 3.5 | −3 | 0.028 | Jb, (Wb), Ef, Mc, Nt, O8, |
| Tr, Ys, Hh, Sv, Zc, Bd, (Ib) | |||||||||
| EVN-L | 1.7 | ET 038 | 28 May 2018 | 40 | 2.3 | 17.2 × 9.1 | −16 | 0.018 | Jb, (Wb), Ef, Mc, O8, |
| Tr, Hh, Sv, Zc, Bd, Sr | |||||||||
| VLBA-L | 1.6 | BT 145 | 5 Oct. 2018 | 59 | 2.5 | 11.4 × 4.3 | 16 | 0.05 | Br, Fd, (Hn), Kp, La, |
| Mk, Nl, Ov, (Pt), Sc | |||||||||
| VLBA-K | 22 | BT 145 | 30 Oct. 2018 | 83 | 3.5 | 0.9 × 0.4 | −10.91 | 5.87(b) | Br, Fd, Hn, Kp, La, |
| 0.066 | Mk, Nl, Ov, Pt, Sc |
Notes.
The noise in the cube map, which is indicated in boldface, is estimated in a range of 500 channels where there is no maser emission. The value reported is the average of the noise for each channel considered in the range.
Station codes are as follows. VLBA, Br: Brewster; Fd: Fort Davis; Hn: Hancock; Kp: Kitt Peak; La: Los Alamos; Mk: Mauna Kea; Nl: North Liberty; Ov: Owens Valley; Pt: Pie Town; Sc: St. Croix. EVN, Jb: Jodrell Bank; Wb: Westerbork Synthesis Radio Telecope; Ef: Effelsberg; Mc: Medicina; Nt: Noto; O8: Onsala; Tr: Torun; Ys: Yebes; Hh: Hartebeesthoek; Sv: Svetloe; Zc: Zelenchukskaia; Bd: Badary; Sr: Sardinia Radio Telescope; Ib: Irbene. Telescopes in parentheses were scheduled but did not take part in the observations or did not produce good data because of technical problems.
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