Date: Fri, 26 Jun 1998 05:38:51 -0600
From: long@apo.nmsu.edu (Dan Long)
Subject: 2.5m night report 980625
                          THURSDAY JUNE 25, 1998
                     APACHE POINT OBSERVATORY SDSS 2.5m
                              OBSERVING  LOG
   The enclosure doors were opened at 19:00 and the fan started.  The
enclosure was rolled off at 20:00.  This opening procedure combined with
the windscreen telescope gap being taped appears to result in better image
quality sooner.
   The skies tonight started out partly cloudy, but improved by around
astronomical twilight and were clear after about 23:00.  Temperatures
stayed within a couple degrees of 66 F all night.  Winds were light
westerly.
   There was a bit of trouble getting the camera going.  We still started
scanning on the equator 2 hours west of the meridian by astronomical
twilight.  After various focus tweaks and a rotator adjustment of seven
arcminutes we were getting images with 1.0 to 1.2 arcseconds fwhm.  A
couple times seeing jumped up to over 1.6 arcseconds then settled back
again over the course of 15 minutes or so.  The 3.5m reported similar
behavior.
   The connection point between the umbilical and the camera for the liquid
nitrogen line was found to be leaking slightly this evening.  Connie
managed to retighten it with some rather unconventional tools.
   At about 03:00 we moved to 2 hours east to hop over the plane of the
galaxy.  Unfortunately the seeing was worse in this direction, going up to
around 1.5 arcseconds.  It was decided that covering the HST fields with
that seeing wasn't going to be very useful, so we went to the meridian and
did a focus sweep.
   We closed up for the night at 5:15.
                                        Dan