Open Access
Table 1
Parameters of the 23 analyzed HST/STIS observation visits.
| Visita | Date (Start) | Start time (UTC) | End time (UTC) | No. of exp. | Used exp. time (min) | Distance to Sun (AU) | Europa diameter (arcsec) | Spatial resolution (km/pixel) | Europa CML (°) | System-III longitude (°) |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1999-10-05 | 08:39 | 15:27 | 9 | 132.7 | 4.96 | 1.07 | 71.5 | 245-273 | 300-157 |
| 2 | 2012-11-08 | 20:41 | 03:28 | 10 | 155.0 | 5.04 | 1.04 | 73.9 | 209-238 | 24-242 |
| 3 | 2012-12-30 | 18:49 | 01:39 | 9 | 164.1 | 5.06 | 1.02 | 74.9 | 79-108 | 360-220 |
| 4 | 2014-01-22 | 14:02 | 20:53 | 10 | 143.4 | 5.20 | 1.01 | 76.0 | 117-146 | 201-61 |
| 5 | 2014-02-02 | 08:19 | 15:07 | 10 | 123.4 | 5.20 | 0.99 | 77.3 | 129-157 | 199-57 |
| 6 | 2014-11-07 | 16:02 | 19:14 | 3 | 30.7 | 5.30 | 0.81 | 94.7 | 224-237 | 68-171 |
| 8 | 2014-12-07 | 20:25 | 23:50 | 3 | 68.3 | 5.32 | 0.89 | 86.6 | 42-57 | 245-354 |
| 9 | 2014-12-16 | 17:46 | 21:09 | 3 | 65.8 | 5.31 | 0.91 | 84.3 | 224-238 | 244-352 |
| 11 | 2015-01-18 | 00:59 | 04:36 | 3 | 102.7 | 5.33 | 0.98 | 78.6 | 261-276 | 250-6 |
| 12 | 2015-01-26 | 22:17 | 01:55 | 3 | 107.0 | 5.33 | 0.99 | 77.9 | 83-98 | 244-1 |
| 13 | 2015-02-22 | 11:00 | 16:17 | 4 | 154.6 | 5.34 | 0.98 | 78.2 | 256-278 | 132-301 |
| 14 | 2015-02-24 | 05:58 | 12:51 | 5 | 195.3 | 5.34 | 0.98 | 78.5 | 77-107 | 67-288 |
| 15 | 2015-03-09 | 01:03 | 08:01 | 5 | 193.4 | 5.34 | 0.96 | 80.1 | 296-325 | 189-52 |
| 16 | 2015-03-21 | 16:59 | 22:21 | 4 | 145.0 | 5.34 | 0.93 | 82.4 | 141-163 | 209-21 |
| 18 | 2015-03-28 | 17:42 | 22:59 | 4 | 124.0 | 5.34 | 0.91 | 84.0 | 133-156 | 216-25 |
| 21 | 2018-04-07 | 11:00 | 16:15 | 2 | 70.0 | 5.41 | 0.94 | 81.3 | 167-189 | 13-181 |
| 22 | 2018-05-08 | 14:00 | 17:45 | 3 | 125.1 | 5.41 | 0.98 | 78.5 | 85-101 | 195-314 |
| 23 | 2018-06-04 | 01:36 | 08:34 | 4 | 162.0 | 5.40 | 0.96 | 80.1 | 253-283 | 45-268 |
| 24 | 2018-06-12 | 22:34 | 03:57 | 3 | 109.6 | 5.40 | 0.94 | 81.4 | 74-96 | 29-201 |
| 25 | 2018-06-14 | 03:11 | 05:23 | 2 | 73.5 | 5.40 | 0.94 | 81.5 | 195-204 | 226-296 |
| 26 | 2018-07-01 | 11:37 | 13:48 | 2 | 75.2 | 5.39 | 0.90 | 84.9 | 154-164 | 250-321 |
| 28 | 2019-07-30 | 04:21 | 06:09 | 2 | 48.7 | 5.28 | 0.94 | 82.0 | 74-82 | 309-7 |
| 29 | 2020-08-17 | 02:26 | 09:21 | 4 | 125.4 | 5.14 | 1.00 | 76.6 | 80-110 | 48-268 |
Notes. aVisit numbers are identical to those used in Roth et al. (2016) and Roth (2021). Visits taken when Europa was eclipsed by Jupiter (7, 10, 17, 19, 20, and 27) are not included here and, thus, missing from the otherwise consecutive numbering.
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