MDM Trouble Report for 2015 May 13

Telescope: 2.4m
Observer(s): Oey (Michigan)
Instrument: CCDS

Problem(s) Encountered:
We now have unstable pointing problems in addition to the collimation
problem, I'm afraid.  The aberration used to be pure coma and now it
is coma + astigmatism.  Image quality is significantly worse but
that may be due to bad seeing, hard to know.

Your theory about the secondary shifting is consistent with our 
experience of impossible pointing.  There seemed to be no 
consistency in what direction the pointing error is with each
new pointing.  It is off by several arcminutes each time, even
with small slews on the order of degrees.  thus, star-hopping
did not seem to help maintain pointing.

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Submitted on 2015 May 14 [4:25:45]