MDM Observatory 2.4m Telescope Observing Report for 2011 Feb 26

Observer(s): Kathryn Kreckel
Institution(s): Columbia

Instrument: CCDS

No Observing (see comments below)
Bad weather most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   Very bad weather all night.

Observing Summary:

Due to thick clouds at sunset, high winds and eventual snow I didn't
manage any science observing tonight.  As a follow-up to the problems
I've encountered with focusing the 1800 grooves per mm grating, I 
did observe a bright star right at twilight, and found that if I 
set the collimator focus to 1167 [700] then the focus on the 
acquisitions camera and in the spatial direction of the spectra agree
fairly well, but the focus in the spectral direction is off.  I need
a collimator focus of about 30 [418] to get spectral focus in lamp
lines, but then a star focused for the acquisitions camera is out of 
focus in the spatial direction of the spectrograph.  As far as I
understand, this astigmatism in the image suggests that the 
problem is in the spectrograph and possibly tied to the grating?

There is a lot of snow out there, I hope I can find/construct a 
sled!

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Submitted on 2011 Feb 27 [6:16:00]