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 < 45 minutes before we started observing). We observed a 20-point grid (TGRID:GRID_5_4_25_80_T_30.DAT). It was clear during the observations that the errors in target position in the engcam images were large. When we used tpoint to calculate the mean error between the observed and fitted positions using the model obtained on MJD 52128 (2001/08/0, tdat:telmod.dat;20) we obtained an rms error of over 10 arcsec, with all the error vectors pointing east-west. As a check, we re-fitted the observations from MJD 52128 in tpoint, and indeed found that it gave a 1.7 arcsec rms error, so Dan & Eric's model was not at fault. When we allowed all parameters to vary with out new 20-point observations, we got a 2.6 arcsec rms error in the new fit. The largest change in parameters from the old fit was in AW (azimuth axis west tilt), which moved closer to zero but with opposite sign: coeff change value sigma 1 IE -0.119 -185.37 2.759 2 IA -8.339 -268.02 2.566 3 AN -0.432 -8.97 0.894 4 AW +12.095 +4.98 0.825 5 HWCA2 +2.323 +2.54 1.164 6 HWSA2 +1.133 +1.20 1.270 7 HNCA1 +1.651 +0.92 1.471 8 HNSA1 -1.821 -2.67 1.429 9 CA +4.141 +21.97 1.878 10 PZZ1 +5.212 -121.24 7.593 11 ACEC +1.956 +4.86 1.514 12 ACES +0.301 -2.00 1.487 13 TX -2.531 -8.31 3.258 Sky RMS = 2.58 Popn SD = 4.59 We found this surprising: what changed in the six days since the last model? We repeated the observations again, as we were worried we had made a mistake in rotator mode or in clearing initial offsets, but obtained almost identical results. So, we implemented our new (sparse 20 point) model, then observed a 25-point grid (TGRID:GRID_6_4_27_87_T_0.DAT). It was immediately obvious that the new model was giving much smaller errors. We calculated the errors between these observations and the 20-point model and got an rms error of 2.7 arcsec, thus confirming the new model produces repeatably small pointing errors. If anyone can explain why the pointing error should change so much in a few days, please do so! We saw many windscreen 'touches' in azimuth, all in CCW direction, none hard enough to abort the drives. French was asked to tweak the appropriate sensor. We closed at 06:00. We do not think we lost science time tonight, as at no time were the skies clear enough for useful spectroscopy. ---=== IMAGING RUN SUMMARY ===--- Run Stripe Flavor Lambda Last Begin End Frame Comments ------------------------------------------------------------------ 2487 100 O ignore 47.83 51.82 36 actually bias, doghouse 2488 100 O bias 52.08 54.66 30 doghouse ---=== IMAGING RUN DETAILS ===--- ---=== SKIPPY RESULTS ===--- Run Frame nFrames stars muErr muRms nuErr nuRms rot --------------------------------------------------------------- ---=== LTMATCH RESULTS ===--- Run Field nFields nGood rowMean rowSig colMean colSig rot --------------------------------------------------------------- ---=== SPECTROSCOPY DATA SUMMARY ===--- UT Exp Time flavor comment (S/N)^2 totals ========================================== b1 r1 b2 r2 ----- sequence 10524, plate -9999 ------- 01:22 10524 0.0 bias {{}} ---=== TELESCOPE OFFSETS AND SCALE I ===--- Time Instrument getclock Az Alt Rot Scale ------------------------------------------------------------------------------ ---=== TELESCOPE OFFSETS AND SCALE II ===--- ---=== DATA TAPE SUMMARY ===--- None sent. ---=== FOCUS LOG ===--- setmir piston Temp Wind Time Inst scale M1 M2 Foc Az Alt (C) MPH Dir filt fwhm ------------------------------------------------------------------------------ 03:05 engcam 1.00000 0 -2505 -275 115 24.5 13.1 19 114 -- 1.7" 05:47 engcam 1.00000 0 -2658 -350 269 64.2 11.6 12 94 -- 1.5" ---=== WEATHER LOG ===--- Wind Time Temp F Dewp F MPH Direction Dust DIMM Sky 19:13 59 47 17 111 (ESE) 716 - Overcast 19:45 59 46 11 85 (E) 739 - " 20:17 58 46 11 84 (E) 728 - " 20:49 59 46 13 110 (ESE) 883 - " 21:25 59 46 10 100 (E) 924 - " 21:58 59 47 12 81 (E) 854 - " 22:30 58 47 12 86 (E) 874 - " 23:02 58 48 15 79 (E) 824 - " 23:38 57 53 18 75 (ENE) 882 - " 00:10 56 48 16 84 (E) 880 - Partly cloudy 00:43 56 47 13 93 (E) 1288 - " 01:15 55 48 17 110 (ESE) 1236 - " 01:47 55 48 13 85 (E) 1534 - " 02:19 55 47 11 93 (E) 1724 - " 02:51 55 46 17 110 (ESE) 2101 - " 03:24 55 46 15 110 (ESE) 2161 - " 03:56 55 45 14 125 (SE) 2558 - " 04:28 55 45 18 124 (SE) 2823 - " 05:00 54 45 18 127 (SE) 2614 - " 05:32 54 46 12 113 (ESE) 2260 - " 06:13 52 48 11 97 (E) 1959 - Thin cloud 06:53 53 47 11 102 (ESE) 2407 - " ---=== TELESCOPE STATUS ===--- 02:00 Fans on, enclosure off 06:00 Enclosure on, fans off Stowed in standard configuration. Engcam mounted. Counterweights at 75. LN2 180L dewars 07:00: Spectro: 193lb Imager: 170lb ---=== SOFTWARE USED ===--- IOP/SOP: v3_53_5 (test, servers restarted to this version by hand) Watcher: v2_9_0 MCP: v5_3_1 (declared current tonight) TPM: v2_4_1 (declared current tonight) AstroDa: v14_36 TCC: 2.5.5 sdssProcedures: v1_22 ---=== MIRROR NUMBERS ===--- Time dpTemp dewPt Press TmpOut HumOut Windd Winds 22:05 59.1 47.6 21.75 65 79.3 11.0 15 PRIMARY: -------- Scale: 1.000000 MIGS TONIGHT NOMINAL Axial A: 0.0510 0.0710 Axial B: -0.0860 -0.0980 Axial C: 0.0620 0.0610 Trans D: 4.2150 4.1800 Lateral E: 1.9360 1.9365 Lateral F: 0.4365 0.4370 GALILS Commanded: 5377. -3699. 923. -208. 31535. 30647. Actual: 5400. -3700. 900. -200. 31550. 30650. SETMIR VALUES primDesOrient: 0.00 -11.80 23.00 1256.90 642.10 primOrient: 0.00 -12.16 22.81 1257.41 642.19 SECONDARY: ---------- Focus: 0.0 Air temp: 15.1 C Altitude: 30.13 MIGS TONIGHT NOMINAL Axial A: -1.2690 -1.2900 Axial B: -1.2850 -1.3150 Axial C: -1.2760 -1.3060 Trans D: 0.1260 0.1890 GALILS Commanded: 1583837. 1583837. 1583837. 2595. 3795. Actual: 1583888. 1583851. 1583869. 2600. 3800. SETMIR VALUES secDesOrient: 1257.00 0.00 0.00 0.00 -175.00 secOrient: 1257.03 0.02 -0.01 -0.01 -175.14 ---=== PROBLEMS IN DETAIL ===--- Problem #1 - Secondary galil TCC transactions when the secondary actuator E failed to move to a full step: 0 3 I SecFocus=0.00 0 3 : [...] 0 0 I TCCStatus="TTT","NNN"; TCCPos=121.00,30.00,0.00; AxePos=121.00,30.09,0.00 0 0 W AzStat=120.998646, 0.000000, 4504390011.24532, 0x00003800; BadAzStatus; AzDTime=0.0 0 0 W AltStat=30.094247, 0.000000, 4504390011.38860, 0x00003800; BadAltStatus; AltDTime=-0.1 0 0 W RotStat=0.000290, 0.000000, 4504390011.54884, 0x00003800; BadRotStatus; RotDTime=-0.1; RotID=1, 0 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 Modu="exe_BrdTelPos"; Text="530100 packets sent successfully" 0 0 I TCCStatus="TTT","NNN"; TCCPos=121.00,30.00,0.00; AxePos=121.00,30.09,0.00 0 0 W AzStat=120.998646, 0.000000, 4504390021.24662, 0x00003800; BadAzStatus; AzDTime=0.0 0 0 W AltStat=30.094247, 0.000000, 4504390021.38868, 0x00003800; BadAltStatus; AltDTime=-0.1 0 0 W RotStat=0.000290, 0.000000, 4504390021.54879, 0x00003800; BadRotStatus; RotDTime=-0.1; RotID=1, 0 0 0 I PrimMount=5400., -3700., 900., -200., 31550., 30650. ax 0 0 I PrimOrient=0.00, -12.16, 22.81, 1257.41, 642.19 axis 0 0 I SecCmdMount=-2825594.,-2825594.,-2825594.,3254.,4454.; CmdDTime=20.8 axis stat 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 0 W Text="failed to adjust collimation and focus" set scale =1. 0 3 > 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