MDM Trouble Report for 2023 Sep 12

Telescope: 2.4m
Observer(s): John Thorstensen (Dartmouth)
Instrument: OSMOS

Problem(s) Encountered:
Notice that I was blindsided by fog because the humidity sensor
was evidently reading far too low.  We really need a reliable 
humidity gauge.

Also, I've been noticing that the 2.4m occasionally slips by 
about 10 arcsec in ra while tracking, enough to lose the guide
star.  This seems to happen more in the north, but I've been
working north a lot this run. I have not noticed if this shows
up in the encoder position; it will likely be hard to diagnose 
unless there's some obvious balance problem or something. 

Finally, the pointing is badly off in the far north. I think the
pointing model needs to be refreshed.  The symptom is that the
telescope has to be pushed east as much as 30 seconds of time 
to find the object.  That's quite a bit!

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Submitted on 2023 Sep 13 [4:55:01]