Table 1
Observing circumstances.
| Date | Time | Object | N | EXPTIME | rh | ro | α | Skymonitor record |
|---|---|---|---|---|---|---|---|---|
| (UT) | (s) | (au) | (au) | (°) | ||||
| 2019-10-22 | 15:27-16:04 | Vesta | 21 | 2 | 2.5 | 1.6 | 10.4 | https://youtu.be/PaU3ign_sdY |
| 2019-11-08(a) | 12:24-17:27 | Vesta | 145 | 2, 3,4, 5, 10, 30 | 2.5 | 1.6 | 4.1 | https://youtu.be/dg5ejH7fPd8 |
| 2019-11-21 | 12:22-16:37 | Vesta | 165 | 2 | 2.6 | 1.6 | 5.7 | https://youtu.be/_gHz8hH7eXQ |
| 2019-12-18 | 13:20-14:57 | Vesta | 67 | 2, 3 | 2.6 | 1.8 | 15.6 | https://youtu.be/ceSwHR12S-s |
| 2020-01-10 | 13:18-13:59 | Vesta | 31 | 2 | 2.6 | 2.0 | 20.7 | https://youtu.be/3Wkn83F4Qzg |
| 2020-02-13 | 09:04-10:00 | Vesta | 30 | 2 | 2.6 | 2.5 | 22.5 | https://youtu.be/VzwG5y-18ME |
| 2020-06-21 | 18:30-19:20 | Ceres | 18 | 20 | 3.0 | 2.5 | 18.9 | https://youtu.be/Y4H6QNyWcp0 |
| 2020-10-02(b) | 09:19-10:30 | Ceres | 20 | 20 | 3.0 | 2.2 | 13.1 | https://youtu.be/muyaqzYcnb4 |
| 2020-10-18 | 08:50-09:59 | Ceres | 22 | 20 | 3.0 | 2.3 | 16.5 | https://youtu.be/6-SD0WrY1No |
| 2021-09-09(c) | 16:15-17:45 | Ceres | 25 | 20 | 2.8 | 2.5 | 20.8 | https://youtu.be/fUuu9HiQT8M |
| 2021-11-07 | 12:34-22:40 | Ceres | 31 | 5 | 2.8 | 1.8 | 8.6 | https://youtu.be/W7xduRk5tSM |
Notes. Date: the UT date in YYYY-MM-DD. Time: the starting and ending UT time in HH:mm. N: the total number of obtained polarimetric sets (one set consists of four exposures). EXPTIME: the exposure times used. rh: the heliocentric distance to the target. ro: the observer-centric distance to the target. α: the phase angle. Skymonitor record: the NHAO skymonitor camera record archived on YouTube (also available in Appendix D). (a)Unstable weather (refer to the skymonitor record). (b)Most H-band frames are saturated. (c)All H-band frames are saturated.
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