MDM Trouble Report for 2017 Jun 21

Telescope: 1.3m
Observer(s): John Thorstensen (Dartmouth)
Instrument: Andor direct + buckeye FW

Problem(s) Encountered:
The classic nodding problem returned while I was tracking a 
target around 2 hr west and a bit north of the horizon.  It 
manifests as random north-south jerks of about 10-15 arcsec; in 
this case it always returned to the center position (it was
not guided back -- the guider recenters things much more 
slowly than what I saw.  The nodding occurred intermittently and
whole minutes went by without it.

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Submitted on 2017 Jun 22 [5:19:50]