Table A.1.
Observational circumstances of the spectra and light-curves presented of 3I/ATLAS in this paper.
| Observing date | N. images | UTstart | UTend | Telescope | Instrument | Filter | Texp (s) | r (au) |
|---|---|---|---|---|---|---|---|---|
| 2025-07-04 | 3 | 00:24 | 00:40 | GTC | OSIRIS+ | R300R | 300 | 4.42 |
| 2025-07-04 | 2 | 00:41 | 00:52 | GTC | OSIRIS+ | R300B | 300 | 4.41 |
| 2025-07-02 | 326 | 21:27 | 02:46 | TTT | Andor Ikon-L | g’ | 50 | 4.44 |
| 2025-07-03 | 232 | 21:46 | 01:42 | TTT | Andor Ikon-L | g’ | 45 | 4.41 |
| 2025-07-05 | 307 | 21:29 | 03:12 | TTT | Andor Ikon-L | g’ | 50 | 4.34 |
Notes. The table includes the date of the observations, the total number of images (N. images), the starting and end times (UTstart and UTend), telescope, instrument, grating/filter used, exposure time of individual spectra/images (Texp), and object’s distance to the Sun (r).
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