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):
  

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

• FWHM for 25 April, 2010 (All night):
  

• Ellipticity for 25 April, 2010 (All night):
  

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

-- DougMiller - 08 Jun 2010