Open Access
Table A.1.
Observing log for 3I/ATLAS
| Date | UTCstart | UTCend | Exp. time (s) | N. images | Seeing (″) | Airmass | r (au) |
|---|---|---|---|---|---|---|---|
| 2025-07-02 | 2025-07-02 21:28 | 2025-07-03 02:47 | 11950 | 239 | 1.1 | 1.5–2.0 | 4.48 |
| 2025-07-03 | 2025-07-03 23:46 | 2025-07-04 03:42 | 10440 | 232 | 1.1 | 1.5–2.0 | 4.41 |
| 2025-07-05 | 2025-07-06 03:22 | 2025-07-06 04:04 | 500 | 10 | 1.9 | 1.6–1.7 | 4.35 |
| 2025-07-06 | 2025-07-06 23:56 | 2025-07-07 04:22 | 1400 | 28 | 1.9 | 1.5–1.9 | 4.32 |
| 2025-07-07 | 2025-07-07 23:31 | 2025-07-07 23:46 | 750 | 15 | 1.6 | 1.8–1.9 | 4.28 |
| 2025-07-11 | 2025-07-11 23:41 | 2025-07-12 04:34 | 10350 | 207 | 1.3 | 1.5–2.3 | 4.15 |
| 2025-07-12 | 2025-07-12 23:44 | 2025-07-13 04:30 | 5900 | 118 | 1.5 | 1.5–2.4 | 4.11 |
| 2025-07-13 | 2025-07-14 00:28 | 2025-07-14 04:05 | 7600 | 152 | 1.6 | 1.5–2.1 | 4.08 |
| 2025-07-14 | 2025-07-15 00:13 | 2025-07-15 04:16 | 2150 | 43 | 1.6 | 1.5–2.3 | 4.05 |
| 2025-07-17 | 2025-07-18 01:03 | 2025-07-18 01:05 | 150 | 3 | 1.9 | 1.5–1.5 | 3.95 |
| 2025-07-18 | 2025-07-18 23:32 | 2025-07-19 01:10 | 1850 | 37 | 1.7 | 1.5–1.6 | 3.92 |
| 2025-07-19 | 2025-07-19 23:32 | 2025-07-20 02:03 | 1750 | 35 | 1.6 | 1.5–1.6 | 3.89 |
| 2025-07-20 | 2025-07-20 23:29 | 2025-07-21 02:01 | 4750 | 95 | 1.4 | 1.5–1.6 | 3.85 |
| 2025-07-21 | 2025-07-21 23:28 | 2025-07-22 02:00 | 2700 | 54 | 1.2 | 1.5–1.6 | 3.82 |
| 2025-07-24 | 2025-07-25 01:33 | 2025-07-25 01:33 | 30 | 1 | 1.6 | 1.6–1.6 | 3.72 |
| 2025-07-25 | 2025-07-25 23:30 | 2025-07-25 23:34 | 60 | 2 | 1.4 | 1.5–1.5 | 3.69 |
| 2025-07-26 | 2025-07-26 23:25 | 2025-07-27 01:29 | 2950 | 59 | 1.7 | 1.4–1.6 | 3.66 |
| 2025-07-30 | 2025-07-30 23:23 | 2025-07-31 02:00 | 3400 | 68 | 1.9 | 1.4–2.0 | 3.53 |
| 2025-08-02 | 2025-08-02 23:18 | 2025-08-03 02:16 | 7950 | 159 | 1.3 | 1.4–2.4 | 3.43 |
| 2025-08-03 | 2025-08-03 23:06 | 2025-08-04 02:09 | 8200 | 164 | 1.5 | 1.4–2.3 | 3.40 |
| 2025-08-04 | 2025-08-04 23:04 | 2025-08-05 01:55 | 6050 | 121 | 1.7 | 1.4–2.2 | 3.36 |
| 2025-08-05 | 2025-08-05 23:04 | 2025-08-06 01:57 | 7500 | 150 | 1.6 | 1.4–2.4 | 3.33 |
| 2025-08-06 | 2025-08-06 23:14 | 2025-08-07 01:51 | 4360 | 88 | 1.4 | 1.4–2.4 | 3.30 |
| 2025-08-18 | 2025-08-18 23:01 | 2025-08-18 23:59 | 2460 | 50 | 1.1 | 1.6–1.9 | 2.92 |
| 2025-08-19 | 2025-08-19 23:02 | 2025-08-20 00:29 | 2960 | 60 | 1.3 | 1.6–2.3 | 2.89 |
| 2025-08-20 | 2025-08-20 23:01 | 2025-08-20 23:53 | 2160 | 44 | 1.6 | 1.6–2.0 | 2.86 |
| 2025-08-21 | 2025-08-21 22:58 | 2025-08-21 23:55 | 2360 | 48 | 1.5 | 1.6–2.1 | 2.82 |
| 2025-08-22 | 2025-08-22 22:54 | 2025-08-22 23:41 | 1860 | 38 | 1.7 | 1.6–2.0 | 2.79 |
| 2025-08-24 | 2025-08-24 22:41 | 2025-08-24 23:59 | 2110 | 43 | 1.4 | 1.6–2.4 | 2.73 |
| 2025-08-25 | 2025-08-25 22:48 | 2025-08-25 22:50 | 100 | 2 | 1.9 | 1.7–1.7 | 2.70 |
| 2025-08-26 | 2025-08-26 22:59 | 2025-08-26 23:15 | 200 | 4 | 2.0 | 1.8–2.0 | 2.67 |
| 2025-08-27 | 2025-08-27 22:46 | 2025-08-27 23:40 | 2100 | 42 | 1.7 | 1.8–2.3 | 2.64 |
| 2025-08-28 | 2025-08-28 22:37 | 2025-08-28 23:34 | 1960 | 40 | 1.3 | 1.8–2.3 | 2.61 |
| 2025-08-29 | 2025-08-29 22:39 | 2025-08-29 23:21 | 1360 | 28 | 1.4 | 1.8–2.2 | 2.58 |
| 2025-09-01 | 2025-09-01 23:01 | 2025-09-01 23:05 | 60 | 2 | 1.5 | 2.2–2.3 | 2.49 |
| 2025-09-02 | 2025-09-02 22:34 | 2025-09-02 22:38 | 60 | 2 | 1.4 | 2.0–2.0 | 2.46 |
| 2025-09-05 | 2025-09-05 22:43 | 2025-09-05 22:43 | 30 | 1 | 1.8 | 2.3–2.3 | 2.37 |
Notes. The table includes the date of the observations, the starting and end times (UTCstart and UTCend), the total exposition time in seconds, the total number of images, median seeing, range of airmass and cometary distance to the Sun (r).
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