ENR CTIO 1.5-m 2025-02-20

We notice that the black plastic bag which covers the vacuum gague's LED light in the coude room fell. Therefore, all images taken on 240219 and the first four images (1116--1119) or two science stars (BR Hyi and T0284200852) are contaminated by the LED light. The plastic bag has been repositioned to cover the LED light.

The pointing continues to be challenging tonight. Even though zpointing is executed for each target, the next target is always beyond the guider's FOV. Between UT 06:40 and 08:20, lost pointing completely. Try to recover the pointing by redo the plumb and zpointing. The plumb line is off quite a bit even though it was calibrated last night. The hand paddle by the console doesn't work again while zpointing, and needs to be disconnected and reconnected. The hand paddle in the control room occassionally won't respond, but works for most of the time. Don't know if the telescope balance causes the pointing problem.