Open Access
Table A.1.
Results of the multi-band photometry of 3I/ATLAS by the FTN, FTS, Lesedi, and Skalnaté Pleso telescopes.
| Date | Telescope | ρ*, km | mr, mag | g − r, mag | g − i, mag | r − i, mag | i − z, mag | V − R, mag |
|---|---|---|---|---|---|---|---|---|
| (2025) | ||||||||
| Jul 2 | Lesedi | 10352 | 17.85±0.05 | 0.44±0.07 | 0.61±0.08 | 0.17±0.08 | – | – |
| Jul 3 | FTN | – | 18.08±0.02 | 0.64±0.02 | 0.99±0.03 | 0.35±0.02 | 0.23±0.04 | – |
| Jul 4 | FTS | – | 18.08±0.02 | 0.68±0.04 | 0.96±0.05 | 0.28±0.03 | 0.15±0.04 | – |
| Jul 5 | Skalnaté Pleso | 10418 | – | – | – | – | – | 0.38±0.02 |
| Jul 7 | Lesedi | 10634 | 17.31±0.07 | 0.67±0.09 | 0.81±0.09 | 0.14±0.10 | – | – |
| Jul 12 | FTN | – | 17.94±0.01 | 0.72±0.03 | 0.99±0.03 | 0.27±0.02 | 0.10±0.03 | – |
| Jul 13 | FTN | – | 17.86±0.02 | 0.61±0.05 | 0.90±0.05 | 0.29±0.04 | 0.10±0.04 | – |
| Jul 15 | Lesedi | 10661 | 17.20±0.05 | 0.69±0.08 | – | – | – | – |
| Jul 16 | FTN | – | 17.96±0.01 | 0.62±0.02 | 0.91±0.02 | 0.29±0.02 | 0.03±0.02 | – |
| Jul 18 | FTN/FTS | – | 17.80±0.02 | 0.62±0.04 | 0.88±0.04 | 0.27±0.04 | 0.10±0.04 | – |
| Jul 20 | Skalnaté Pleso | 11640 | – | – | – | – | – | 0.33±0.02 |
| Jul 21 | FTN | – | 17.78±0.02 | 0.67±0.03 | 0.96±0.02 | 0.29±0.03 | 0.08±0.02 | – |
| Jul 22 | Skalnaté Pleso | 11490 | – | – | – | – | – | 0.47±0.02 |
| Jul 23 | Lesedi | 10584 | 17.15±0.02 | 0.71±0.04 | – | – | – | – |
| Jul 23 | Skalnaté Pleso | 11418 | – | – | – | – | – | 0.51±0.02 |
| Jul 24 | FTS | – | 17.52±0.01 | 0.73±0.03 | 0.97±0.03 | 0.25±0.02 | 0.09±0.03 | – |
| Jul 26 | FTN | – | 17.71±0.01 | 0.64±0.02 | 0.94±0.02 | 0.30±0.02 | 0.10±0.03 | – |
| Jul 28 | FTN | – | 17.55±0.01 | 0.65±0.03 | 0.93±0.03 | 0.28±0.02 | 0.09±0.02 | – |
| Jul 29 | FTN | – | 17.73±0.01 | 0.67±0.02 | 0.94±0.02 | 0.27±0.02 | 0.06±0.02 | – |
| Average | – | – | – | 0.65±0.03 | 0.91±0.03 | 0.27±0.03 | 0.10±0.04 | 0.42±0.02 |
* The projected size of the photometric aperture at the distance of the comet.
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