Date: Mon, 13 Aug 2001 07:33:44 -0600 (MDT)
From: prn@apo.nmsu.edu (Pete Newman)
Subject: 2.5m obslog 20010812 (MJD 52134)
                       APACHE POINT OBSERVATORY SDSS 2.5M
                                 OBSERVING LOG
                             Sunday August 12, 2001
                                  (MJD 52134)
---=== OBSERVING TEAM ===---
Swing shift: Eric Neilsen (FNAL)
Night shift: Jurek Krzesinski (APO), Pete Newman (APO)
---=== OBSERVING PLAN ===---
Check pointing model, then science with usual priorities.
---=== OBSERVING SUMMARY ===---
We opened at 2am and were able to build a good pointing model under cloudy
skies.  No science.
We apologies for any bad 'line wrapping' in this log.  There's something
funny going on...
---=== OBSERVING LOG ===---
Bad weather kept us closed until about 02:00 MDT.
During preflight checks, we had a recurrence of the secondary E actuator
failing to finish its move on a full step, so that the collimate process
reported errors.  We homed the E actuator (the position error was 1), which
solved the problem.  We moved the mirror arround at various altitudes and
could not reproduce the error.  The PR (2560) was updated.
We opened under partly cloudy skies at ~02:00 and tested the pointing model
installed during shakedown.
The couterweights to balance the engcam were set to 75.  This is lower than
before the summer recess by ~50 counts, so the settings for other instruments
May also need to be lowered.
We focused the engcam to 1.7" FWHM images with ~10 per cent asymmetry (11.7
pixels vs. 10.2 pixels).  The FWHM and asymmetry both decreased later,
presumably as the mirrors reached equilibrium (the fans for  Started; Cmd='set scale =1.'
0 0 I PrimDesOrient=0.00, -11.80, 23.00, 1256.90, 642.10; PrimConstRMS=0.00
0 0 I  SecDesOrient=-2243.00, 0.00, 0.00, 0.00, -175.00;  SecConstRMS=0.00
0 0 I PrimCmdMount=5377.,-3699.,923.,-208.,31535.,30647.; CmdDTime=2.1
0 0 I PrimMount=5400., -3700., 900., -200., 31550., 30650.
0 0 I PrimOrient=0.00, -12.16, 22.81, 1257.41, 642.19
0 0 I  SecCmdMount=-2825594.,-2825594.,-2825594.,3254.,4454.; CmdDTime=20.8
0 0 F Modu="mir_o_MoveOneGalil"; Text=" Sec returned an error message"
0 0 I Received="?GOCORR one or more axes did not end on a full step  0,  0,  0,  0,  1"
0 3 W Text="failed to adjust collimation and focus; new focus and/or scale recorded but not successfully applied"
0 3 I ScaleFac=1.000000