UT 20120305 AGw#3 at LFBG Verification

Observer: DMiller (Tucson), DThompson (LBTO), JHeidt (LBTB)
Telescope Operator: SAllanson (LBTO)
Telescope Support: JUrban(LBTO)
Instrument Support: TShih (LBTO)

Summary

Details

02:00 Modified oacontrol.conf.20120304a (called now 04b) to have the new guider hotspot, measured 20120204, to be x=260, y=288

02:15 Steve restarted oacserver several times, but failed. /var/log/messages on agw-control computer says LOG_ERR ERROR while parsing config file: syntax error. Does not say which line or what the syntax error is.

04:45 Doug finds that Thomas Hahn (tmh 20120207) added a lim_f=-13908 #=> ~0.5deg or..... I think comment # is not allowed after a parameter. Moved the comment and will retry.

05:00 Dave and Jochen finish collecting a 32 star transformation set.

05:20 Doug start calculating a new transformation. The plan is to make new transformation, install it and then dither along a slit.

10:30 Doug does not have any success building a transformation. Specifically, he can reproduce Jesper's results from 20120915, but could not reproduce his results from yesterday. Jesper emails a new transformation and instructions on which numbers to change.

10:45 Steve restarts oacserver. Starts fine, so the comment on the same line as a parameter must have been the problem.

10:50 Doug runs transform_collect on 6 stars. Average value is not the center of rotation because of flexure, but the error is about +- 1 pixel on LIUCI.

20120308 Doug processed this small transform set (/Work/AGW_Data/20120305/transform2). In this data set the X_0 and Y_0 value were not the "correct" values in the they were not using the average position of X and Y for all position angles. The values used, -0.4, 612.5, are for PA=-90 (ie rotator angle = 250). However, because of flexure in LUCI, the average value should be used so the transformation is reasonable for all rotation angles. However, it is interesting that we measured such small rms error. I think these are near the value expected from the movement accuracy measure with the laster tracker. The important numbers are:
X_rms = 5 um
Y_rms = 9 um

rgpoff:  1.0800000 psigpoff:  0.7068600
Quad III
Transformation:
ax1 + by1 + kx = x2
 -1.0021421867419507 -0.005491441853311629 -0.04311635181921458
ax1 + by1 + ky = y2
 0.005491441853311629 -1.0021421867419507 612.9944976043214
RMS(X)=  0.00482  RMS(Y)=  0.00924

        Scale factor:  1.0021    
Rotation Angle (rad):   3.1470697
Rotation Angle (deg): 180.3139567
  Mirrored transform: NO

Star no   x_targ     y_targ    x_comp   y_comp      X-res        Y-res
      1       86.139      521.055       86.137      521.065      0.00200     -0.01008
      2        1.727      493.031        1.729      493.024     -0.00163      0.00701
      3      -37.126      599.321      -37.117      599.307     -0.00840      0.01425
      4     -141.624      564.153     -141.626      564.161      0.00219     -0.00792
      5      -79.161      608.673      -79.167      608.676      0.00584     -0.00326
M_X_GP:   1 M_Y_GP:   1 signphi:   1

11:00 Jesper emails that there was a typo and that the Y_0 value in aocontrol.conf should be 611.5 rather then 612.5. Doug changes the oacontrol.conf file and Steve restarts oacserver.

11:03 Doug transform_collect the same 6 stars. Average y changed from 1042 to 1053. A bit of overshoot, but that because fo flexure.

11:10 Doug starts dice5_collect, InformationTechnologyER=5, DIST=10, EXP=4.0. Had a previous 0,30 RA/DEC offset to the dice5 is not centered on the center of rotation. This is OK.

20120308 Doug processed this small transform set (/Work/AGW_Data/20120305/transform3). This set has the X_0 and Y_0 suggested by Jesper for from the average on-axis position due to LUCI flexure. The important numbers are:
X_rms = 33 um
Y_rms = 46 um

Thus, this transformation a comparable to the previous transform use prior to the AGw#3 repair.

Quad III
Transformation:
ax1 + by1 + kx = x2
 -1.002697401208181 -0.005059913324192644 -0.33766767954466137
ax1 + by1 + ky = y2
 0.005059913324192644 -1.002697401208181 613.0929610416287
RMS(X)=  0.03252  RMS(Y)=  0.04588

        Scale factor:  1.0027    
Rotation Angle (rad):   3.1466365
Rotation Angle (deg): 180.2891358
  Mirrored transform: NO

Star no   x_targ     y_targ    x_comp   y_comp      X-res        Y-res
      1       85.902      521.148       85.942      521.191     -0.03967     -0.04318
      2        1.529      493.150        1.501      493.102      0.02746      0.04819
      3      -37.366      599.431      -37.414      599.424      0.04768      0.00650
      4     -141.984      564.156     -141.961      564.218     -0.02306     -0.06157
      5      -79.503      608.832      -79.490      608.782     -0.01241      0.05006
M_X_GP:   1 M_Y_GP:   1 signphi:   1

11:15 Doug used IRAF, ds9 &, imexam, a to find the centroid of the star on LUCI.

11:42 Complete the dice5 data collection.

-- DougMiller - 05 Mar 2012

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Topic revision: 25 Jul 2014, DouglasFisher
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