Airmass jumped unexpectedly at ~19:20 CLT from values around 1.5 to >8 for a brief period of several minutes, then returned to ~1.6. RA offsets during first quarter rose to ~20" several times, but returned to ~10".
There was an issue with SISPI (TCSINTERFACE alert) requiring a halt of observations for about 5 min around CLT 21:45. Issues with slewing seemed to appear around UT 00:30 and persisted until the SISPI reset. Observations were still obtained, and the RA and DEC pointing offsets were generally below 20" during this period. One frame may have been affected during the reset during 2025lxv_P1.
Another pattern of DEC offset zigzagging aroung CLT 00:40, but the night assightant confirmed that the slew was still working correctly.
There was another short interruption at the very end of the night (CLT 6:15) due to an issue with the TCS.
| Total Times | Time Observed | Time Engineering | Time lost technical | Time lost weather | Time lost other | Total Program Time |
|---|---|---|---|---|---|---|
| 2025-06-20 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0 |
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A couple minutes to spare at the very end, but we decided not to add additional targets to ensure that there was enough time to slew for the twilight frames to begin on time,