Table 1.
Observing log of the four nights.
| Date |
|||
|---|---|---|---|
| Start/End UT time | Airmass | τ0 | Seeing |
| Target | ΔRA/ΔDec | NEXP/NDIT/DIT | |
| 2021-08-27 | |||
| 01:14:57/03:41:51 | 1.03–1.35 | 3.6–7.0 ms | 0.5–0.9″ |
| HD 206893 A | 0/0 mas | 6/64/1 s | |
| HD 206893B | 17/201 mas | 4/16/30 s | |
| HD 206893 (no det) | −20/72 mas | 4/32/10 s | |
| HD 206893 (no det) | −50/54 mas | 4/32/10 s | |
| HD 206893 (no det) | −70/30 mas | 4/32/10 s | |
| 2021-08-28 | |||
| 01:55:39/03:55:29 | 1.02–1.18 | 4.8–7.4 ms | 0.6–0.9″ |
| HD 206893 A | 0/0 mas | 6/64/1 s | |
| HD 206893 (no det) | −72/6 mas | 5/32/10 s | |
| HD 206893 (no det) | −70/−20 mas | 5/32/10 s | |
| HD 206893c | −55/−50 mas | 5/32/10 s | |
| 2021-09-28 | |||
| 01:13:14/03:53:59 | 1.00–1.15 | 3.9–3.4 ms | 0.8–1.2″ |
| HD 206893 A | 0/0 mas | 10/64/1 s | |
| HD 206893c | −76/−82 mas | 11/32/10 s | |
| HD 206893 (no det) | −65/−30 mas | 8/12/30 s | |
| 2021-10-16 | |||
| 23:41:45/03:07:57 | 1.00–1.22 | 1.6–3.3 ms | 0.4–0.6″ |
| HD 206893 A | 0/0 mas | 12/64/1 s | |
| HD 206893c | −76/−82 mas | 27/32/10 s | |
Notes. τ0 denotes the atmospheric coherence time. The values ΔRA/ΔDec are the placement of the science fiber relative to the fringe tracking fiber (which is always on the central star). NEXP, NDIT, and DIT denote the number of exposures, the number of detector integrations per exposure, and the detector integration time, respectively.
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