Table 2
Observation log table.
| Night | Night # | Instrument | prog. ID | Exposure time (s) | In/total # | Seeing (″) | Airmass | S/N |
|---|---|---|---|---|---|---|---|---|
| 2022-01-26 | 1 | ESPRESSO | 108.2254.003 | 500 | 17/31 | 0.50–0.62–0.89 | 1.00–1.09–1.72 | 21–28–30 |
| 2022-02-12 | 2 | ESPRESSO | 108.2254.003 | 500 | 6/19 | 0.54–0.79–1.10 | 1.05–1.23–1.73 | 20–26–31 |
| 2023-02-25 | 3 | ESPRESSO | 110.24CD. 003 | 500 | 17/31 | 0.44–0.66–1.06 | 1.00–1.06–1.60 | 20–28–31 |
Notes. The columns from left to right show the date of the observing night, the number index of a given night, the instrument used, the program number, the exposure time, the number of in-transit and total spectra on a given night, the seeing, the airmass, and the average S/N. Note that for seeing airmass and average S/N, we provide the value in min-median-max format. S/N is the average over all orders for a given instrument. For ESPRESSO, this does not account for double-order structure of the spectra, meaning the total S/N is generally higher by a factor of ![Mathematical equation: $\[\sqrt{2}\]$](/articles/aa/full_html/2026/04/aa55811-25/aa55811-25-eq14.png)
at a given wavelength.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.