MDM Trouble Report for 2013 Mar 17

Telescope: 2.4m
Observer(s): Marat Musin, Jacob Brown (university of Missouri)
Instrument: OSMOS+R4k

Problem(s) Encountered:
We noticed that 5-7 exposures (of the same object, we only 
did the dithering) after we did pointing we could not see 
any stars on the  Autoguider Image  window. 
And sometimes we could see different stars 
(we were comparing the positions of the stars in the  Guide Star 
Selector  window of JSkyCalc), that told us that we need to 
re-point. We were choosing the nearest bright star 
(and for all the times it was the same star, since we were moving
the telescope by only ~1-2 minutes) and bright star was always 
far to the right on the TIFCAM screen 
(and was not moving in the vertical position). 
The shift was that big that we had to switch to roi2k.
If it were just a problem with the guider we would 
have been able to keep using it by just manually selecting 
 X  and  Y  coordinates in the MIS window, but it seems the 
telescope also has some problems.

One more thing was that we noticed for one of the image we had 
a strange counter-clockwise rotation of the guided star in the 
 Autoguider Image  window. 
The period of rotation was about 1-2 minutes 
and that of course ruined the image.

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Submitted on 2013 Mar 18 [7:04:40]