MDM Trouble Report for 2017 Nov 04

Telescope: 2.4m
Observer(s): Douglas, Nunez, Halpern (Columbia)
Instrument: OSMOS

Problem(s) Encountered:
We ran into several issues tonight. 

First, we had guiding problems - the guider appeared to freeze after
taking the first guide image (so in the guide tab, we selected 
Expose, hit start, then selected Track, and hit start. The guider
would take a single new image, then stop updating). This happened
twice. Both times, we tried the solution from the archive on Oct 16,
but it didn't initially appear to have an effect until we hit 
Stop and Start another time or two. It's not clear whether it's 
actually the new settings or just the stopping/starting that made
it start guiding again.

Second, one of the mirror A/C ducts ripped. This may have happened 
when we were too close to zenith and the telescope rotated into a 
limit. (This is when we noticed it, at least.) We lost time to 
getting the telescope back out of limits, but it didn't seem 
like there was anything we could do about the duct.
We didn't turn the A/C back on again at the end of the night. 

Finally, the telescope ran away again, this time when we were 
slewing to zenith to shut down. Again, we were observing at 
RA~22, and zenith was RA~01. The telescope ran away West when
it should have been slewing East. Our best guess is that the 
TCS is glitching and trying to go all the way around the circle
(decreasing in Dec) instead of realizing it needs to go East and 
cross 0 to get back to low RA. This time, we noticed before it
hit the limit and hit stop on the TCS. We slewed by hand back 
to RA~0, and then sent it to zenith successfully. 

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Submitted on 2017 Nov 5 [3:31:29]