Table 2
Log of the observations for nights of 27 February (observations 1 and 2) and 28 February 2020 (observation 3).
| Obs. | Target | Date | ϕ | Seeing | AM | τ0 |
|---|---|---|---|---|---|---|
| (MJD) | (′′) | (ms) | ||||
| q Car | 58907.11 | 0.78 | 1.40 | 6.0 | ||
| 1 | ℓ Car* | 58907.12 | 0.05 | 0.66 | 1.32 | 5.3 |
| B Cen | 58907.13 | 0.85 | 1.39 | 6.1 | ||
| 2 | ℓ Car* | 58907.14 | 0.05 | 1.15 | 1.27 | 6.0 |
| ϵ Ant* | 58907.15 | 0.69 | 1.02 | 6.9 | ||
| e Cen | 58907.28 | 1.26 | 1.10 | 4.8 | ||
| bet Vol* | 58907.99 | 0.79 | 1.51 | 6.3 | ||
| 3 | ℓ Car* | 58908.00 | 0.07 | 0.81 | 1.66 | 6.3 |
| bet Vol* | 58908.01 | 0.91 | 1.42 | 15.7 | ||
Notes. The table lists: the modified Julian date (MJD), the pulsation phase ϕ, the seeing (in arcsecond), the air mass (AM), integrated water vapour (IWV) at 30 deg elevation (in millimeter) and the coherence time τ0 (in millisecond). Stars used in the visibility calibration strategy are marked with an asterisk (see Sect. 3.1). q Car and β Vol are usedto calibrate the total flux (see Sect. 3.2), while e Cen is used to check the consistency of the other calibrators (see Appendix B). The calibrator B Cen was not used; see Appendix B.
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