Left Direct Gregorian Performance Verification

  • Data were collected on April 25th and 26th, 2010 by JHeidt, PHibbon and DMiller
  • Date were analyzed by KRueff and DMiller

Data Collection

Elevation Preset Guiding/Collimation Dice5 (1x1) Dice5 (10x10) Large Offsets (1'-3') Inverse Field
25 1 1 b c    
40 3, 13 13 15 12    
55 5, 14 14 2 d f  
70 8, 9, 10, 11, 17 9, 10, 11, 17 4 e   16
85 6 6, g a 7    

*NOTE* References 1-17 are from 20100425.
*NOTE* References a-g are from 20100426.

Results

Small (1") and Medium (10") Offset Accuracy

  Dice5 (1"x1")
Elevation Ra Sigma Dec Sigma Average Distance Ellipticity FWHM
25 23.28 19.60 26.67 0.13 +- 0.04 0.75 +- 0.10
40 14.24 37.60 34.05 0.065 +- 0.03 0.66 +- 0.12
55 18.16 34.67 33.86 0.046 +- 0.02 0.84 +- 0.17
70 n/a n/a n/a n/a n/a
85 15.30 19.17 21.33 0.045 +- 0.025 0.46 +- 0.07
Full Set Average 17.87 28.56 29.01  
=> Sigma values measured in milliarcsec

  Dice5 (10"x10")
Elevation Ra Sigma Dec Sigma Average Distance Ellipticity FWHM
25 18.50 40.32 37.47 0.13 +- 0.04 0.73 +- 0.065
40 32.14 39.63 43.77 0.06 +- 0.03 0.65 +- 0.09
55 20.04 29.18 33.07 0.04 +- 0.02 0.50 +- 0.03
70 27.43 13.96 27.22 0.05 +- 0.03 0.45 +- 0.05
85 18.51 30.52 31.39 0.05 +- 0.03 0.53 +- 0.09
Full Set Average 23.61 31.78 34.68  
=> Sigma values measured in milliarcsec

Image Position Stability at the Instrument Focus

  • Results are from the measured position of the on-axis star on the IRTC from the Data sets labeled Guiding/Collimation in the table above

Elevation Ra Sigma Dec Sigma Average Distance Ellipticity FWHM
25 47.37* 48.93* 55.98* 0.10 +- 0.03 1.09 +- 0.11
40 26.73 27.22 32.45 0.075 +- 0.02 0.46 +- 0.03
55 21.41 13.02 21.04 0.04 +- 0.02 0.41 +- 0.03

70
15.38
15.38
14.80
16.80
26.37
20.34
18.82
17.52
23.31
23.33
20.65
20.90
0.038 +- 0.02
0.060 +- 0.02
0.064 +- 0.03
0.060 +- 0.035
0.55 +- 0.065
0.67 +- 0.10
0.53 +- 0.06
0.48 +- 0.08
85 35.98 25.14 36.52 0.05 +- 0.03 0.49 +- 0.05
Full Set Average 23.50 20.85 26.51  
=> Sigma values measured in milliarcsec * Elevation 25 set taken in average seeing of 1.34". Not included in the Full Set Average

Guiding Corrections and Guide Image Ellipticity

  • Results are from the measured position and Ellipticity of the Guider image determined using Source Extractor

Elevation X Correction Sigma Y Correction Sigma Average Ellipticity Average FWHM
25 36.65* 48.43* 0.094* 1.34*
40 18.51 17.79 0.059 0.61
55 18.34 18.25 0.142 0.56

70
22.44
24.56
19.36
15.83
21.27
21.89
20.62
20.38
0.050
0.097
0.118
0.066
0.77
0.86
0.71
0.68
85 28.18 32.06 0.043 0.61
Combined Set 29.52 29.53 0.083 0.76
* Elevation 25 set taken in average seeing of 1.34". Not included in the Full Set Average
=> Sigma values measured in milliarcsec
=> Average FWHM is in arcsec

  • Guiding corrections for 25 April, 2010 (All night):
    20100425_guide_time.png

  • Guiding (X/Y) corrections for 25 April, 2010 (All night):
    20100425_guide_xy.png

  • FWHM for 25 April, 2010 (All night):
    20100425_fwhm.png

  • Ellipticity for 25 April, 2010 (All night):
    20100425_ellip.png

Active Optics/Collimation Performance

  • Wavefront Error (WFE) during ~20 minute data set

Elevation Average WFE WFE Sigma
40 247 86
55 315 140

70
423
350
337
281
110
106
130
99
85 283
116
Average 283 21.74
* Elevation 25 not included

collimation_all.png

-- DougMiller - 08 Jun 2010
Topic attachments
I Attachment Action Size Date Who Comment
20100425_ellip.pngpng 20100425_ellip.png manage 160 K 16 Jun 2010 - 17:00 DougMiller Ellipticity for 25 April, 2010 (All night)
20100425_fwhm.pngpng 20100425_fwhm.png manage 142 K 16 Jun 2010 - 16:59 DougMiller FWHM for 25 April, 2010 (All night)
20100425_guide_time.pngpng 20100425_guide_time.png manage 156 K 16 Jun 2010 - 16:58 DougMiller Guiding corrections for 25 April, 2010 (All night)
20100425_guide_xy.pngpng 20100425_guide_xy.png manage 122 K 16 Jun 2010 - 16:59 DougMiller Guiding (X/Y) corrections for 25 April, 2010 (All night)
collimation_all.pngpng collimation_all.png manage 155 K 15 Jun 2010 - 22:52 DougMiller LDG Active Optics Performance
Topic revision: r12 - 11 Apr 2011, KonstantinaBoutsia
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