MDM Trouble Report for 2025 Dec 21

Telescope: 2.4m
Observer(s): Meghna Sitaram, David Schiminovich (Columbia University)
Instrument: CHaS

Problem(s) Encountered:
Trouble due mainly to operator error: platform was left slightly raised after an instrument tweak and 
in the middle of the night the telescope stopped guiding and tracking during an observation. 
Telescope was sent to zenith to diagnose and during this slew the instrument rotator rotated (locking screw freed)
presumably due to contact with railing.  The rotator was not powered, so we couldn't reset the rotation angle to 0 
(and also wouldn't have been able to re-lock rotation). Because of this, we left the instrument in this position
for the rest of the night.

As far as we can tell, instrument and telescope systems are working. We used the time to install, focus and test 
the high-resolution microlens array. We obtained lamp and some non-tracking sky calibration data towards the end 
of the night.


------------------------------

Submitted on 2025 Dec 22 [6:03:47]