Date: Fri, 20 Feb 2004 09:47:22 -0700
From: Dan Long
Subject: Re: 2.5m obslog 20040219 (MJD 53055)
>  >                                  OBSERVING LOG
>>                             Thursday February 19, 2004
>>
>>                                    (MJD 53055)
>  ...
>>  Plate 1461 (cartridge 2):  FK5 again needed to acquire the field.  The FK5
>>  was 10" S of its original pointing.  After the preCal finished it
>>was noticed
>>  that sp1 had gone out of collimation (r1 XSIGMA and WSIGMA were both in the
>>  red).  The science exposure was aborted at this time and sp1 was
>>recollimated.
>>  The time lost to recollimation was logged as a spectrograph problem.
>
>Shouldn't we have a separate logging category for spectrograph focussing?
>
>Jon
Hi Jon,
    I think this is appropriate.  The spectrographs were focused in
the afternoon and the night time temperature dropped less than 5 C.
Thermal issues shouldn't play a part with such small temperature
change.   Since refocusing was required it would indicate that there
is a problem, especially since it only went out of spec in sp1.
				Cheers,
				  Dan