MDM Observatory 2.4m Telescope Observer's Report for 2008 Feb 28

Observer(s): John Thorstensen
Institution(s): Dartmouth

Instrument: Modspec + Echelle CCD

Worked for 11 hours (all night)
Conditions were Non-Photometric most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   Beg: Seeing 1.5 arcsec, Cirrus, Winds Light & Variable
   Mid: Seeing 1 arcsec, Cirrus, Winds Light & Variable
   End: Seeing 1 arcsec, Cirrus, Winds Light & Variable

Observing Summary:

Seeing was good, but it was cirrussy to varying degrees 
pretty much all night long.

This didn't cause any trouble, but the telescope did some singing
last night, rarely and intermittently giving off high-pitched 
(maybe 1 kHz?) loud sounds.  Sometimes this happened while 
tracking, other times when slewing.  The pitch sounds consistent
and exactly constant.  It sounds like a pure sinusoid -- no
discernible tone color.  It's so rare that it would be
very difficult to diagnose, so it's probably not worth
trying to track itdown right now ... 

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Submitted on 2008 Feb 29 [6:44:53]