March BG Com Night 7, March 12-13 2009 MST

Observers: Richard Green, Andrew Rakich
Telescope Operator: Aaron Ceranski
SW Support: Torsten Leibold
Telescope Support:

Summary:

Closed at the beginning for threatening clouds. Opening at 23:00, with clouds backing out for the moment, grabbed an hour, then closed. Verified that pointing was back very close to nominal value from pointing model, checking with three bright stars. Seeing was poor (1.5-2.0"), and equilibrium not well established, so collimation converged to only 400 nm. Closed at 5:15 am.

Detail (Times reported in MST below):

Open 23:00; engineering team had been exercising the direct Gregorian rotator, and working on other issues, so encoders are being reset.

23:18 pointto M5_0444
23:22 GCS kill and restart after hang on image
repeat pointto
star is on edge of acquisition field, without 9 arcminute elevation offset, but with new version of PCS
(Michele Note: The PCS change should have had nothing to do with the quality of the pointing.)
23:30 pointto M5_0441 - right on target
23:40 pointto BS9143 for Andrew measurements of field aberrations; seeing doesn't look promising ~1.3-2.2" collimation converging only to 400 nm
00:04 Going to guide star #14 to test that pupil is in right position... AGw stage position x=-18.45, y=108.26, image #12 in 090313w
00:08 Closing for line of advancing clouds

05:15 have given up on even a 10 minute hole (which would have been made good use of).

Plan:

Re-Measure AGW-PCS Transformation (2hr per field; Storm, Thompson):

  • Prerequisites:
    LUCIFER accurately oriented on sky
    (PA=0 requested yields PA=0.00+/-0.02)
  • Use source list: LBTdefault.cat (it has been modified to include this field)
  • Pointto M67astrom at PA=0
  • New finding charts attached to this wiki page:
    http://wiki.lbto.arizona.edu/twiki/bin/view/Commissioning/StarCharts
  • Measure:
    1. Take LUCIFER rotator center data (30s ea, TRACK mode, PA=0, 180, 90, 270) (done on 20090311 UT)
    2. Observe multiple (~20) guide stars at PA=0, some repeats
    3. Repeat field at PA=15, significant fraction of stars from previous step
    4. Do two stars at PA=70, 50, 30, 10, -10, -30, -50, -70, different radii
  • Record:
    1. Date and time of observation
    2. 30s LUCIFER image, filename
      (may need J or narrow band for bright stars, coadds)
    3. Star number observed, acquisition image for this preset
    4. PCS XY coordinates
    5. AGW XY and encoder values

Field Aberration Measurements

Persson's Star = Start time =

Guide Star x y PA Doug's Angle wfscimage000*
- 0 612.5 0 9 1-3
6 0 520.0 43 273 4-6
- 0        
  0        
- 0        
  0        
- 0        
  0        
- 0        
  0        
- 0        
  0        
- 0        
  0        
- 0        

End time =

Persson's Star =
Start time =

Guide Star x y PA Doug's Angle wfscimage000*
- 0 612.5 0 9 1-3
6 0 520.0 43 273 4-6
- 0        
  0        
- 0        
  0        
- 0        
  0        
- 0        
  0        
- 0        
  0        
- 0        
  0        
- 0        

End time =

Pupil Measurements

Please check that the optics alignment remains OK with the pupil viewer in LUCIFER.

  • Alignment of chief ray to LUCIFER pupil with M3 (Andrew, Walter, John, 2 hours)
    • Point to bright star
    • Insert LUCIFER pupil viewer
    • Take Pupil image
    • Offset rotator 180 deg
    • Take Pupil image
    • Iterate M3 tip-tilt to minimize the pupil motion
    • Compensate pointing with IE,CA

Measure LUCIFER full-field images above and below focus.

Performance verification

BG Berformance Verification


-- JoarBrynnel - 02 Mar 2009
Topic revision: r9 - 27 May 2009, JohnHill
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