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EUROPEAN SOUTHERN OBSERVATORY |
| NTT Technical Report: Guide Probe Mapping LSO-TRE-ESO-40200-X/X.0 |
| Prepared | O.Hainaut | 2003-05-13 |
| 0.1 |
2003-05-13 ohainaut |
This document lists and analizes the results of NTT Guide Probe position measurement. The analysis leads to a conversion from/to RA-Dec to/from XY.
The data were acquired by M.Billeres in March 2003. The method consists in pointing an open cluster, then to move the guide probe to several stars in the cluster, always centering the GP on the star (using the "move to ref.spot" button on the correponding GUI) without moving the telescope.
This experiment is reproduced for a rotator offset of 0 and 180deg.
Rotator = 0deg:
RA Dec X Y 09 17 07.05 -36 39 10.69 138.2 11.5 09 16 59.55 -36 40 15.92 138.0 29.8 09 16 52.53 -36 45 37.84 77.6 41.3 09 16 41.82 -36 40 30.47 132.6 69.3 09 16 40.50 -36 43 49.19 95.5 69.5 09 16 32.74 -36 47 43.76 51.2 83.6 09 16 14.10 -36 47 02.65 55.9 125.6 09 16 13.48 -36 46 15.24 64.6 127.6 09 16 02.42 -36 46 10.13 63.7 152.4 09 16 00.19 -36 47 42.11 45.8 156.3 09 15 47.83 -36 50 08.12 17.5 181.4 09 15 42.56 -36 48 06.77 39.4 195.0 09 15 45.62 -36 47 41.31 44.4 188.5 09 15 34.21 -36 47 05.35 49.2 214.4 09 15 11.84 -36 41 07.69 111.7 269.8 09 15 02.07 -36 42 22.18 113.2 279.9 09 14 56.69 -36 43 33.20 96.4 290.3 09 14 57.67 -36 44 44.09 82.1 301.1 09 15 10.65 -36 36 35.78 161.8 275.9
Rotator = 180deg
09 16 56.78 -36 36 05.98 166.3 293.1 09 15 47.40 -36 25 27.48 40.8 130.2 09 16 13.77 -36 26 12.34 45.1 189.9 09 16 21.00 -36 23 08.48 9.9 203.4 09 16 29.80 -36 23 03.19 7.5 233.1 09 15 58.90 -36 24 11.34 24.9 154.9 09 15 49.76 -36 24 34.85 30.8 134.7 09 15 39.71 -36 25 53.40 47.0 113.7 09 15 31.97 -36 24 50.72 36.5 95.1 09 15 25.51 -36 25 41.05 46.8 81.4 09 15 30.61 -36 29 20.54 86.6 95.9 09 15 19.61 -36 29 51.43 94.1 71.9 09 15 14.52 -36 27 22.97 67.4 58.3 09 15 11.76 -36 26 40.13 59.9 51.5 09 15 14.10 -36 25 22.73 45.4 55.0 09 15 08.25 -36 25 38.24 49.1 42.8 09 14 55.08 -36 29 38.69 90.8 12.7 09 14 59.97 -36 34 03.97 144.0 31.6 09 14 50.44 -36 35 05.60 154.8 2.7
Using the POS1 package [1], the astrometric solution of the data was computed.
Rotator = 0.deg
*- X-Transformation
No of data = 10 No of variables = 4
Constant term = 0.21831649E+00
Variable Coefficient Variation of coefficient
Fct( X ) 0.107430E+00 0.377032E-05 [mDeg/unit]
Fct( Y ) -0.152427E+01 0.130356E-05
Fct( XY ) 0.558777E-01 0.938336E-04
R square = 0.10000E+01
R.A. is toward y<0
Approx. Pos.Angle: -85.97
Approx. plate scale: 5487.377 miliarcsec per Pixel or Micron
*- Y-Transformation
No of data = 10 No of variables = 4
Constant term = 0.12575173E+00
Variable Coefficient Variation of coefficient
Fct( X ) -0.149838E+01 0.138385E-04 [mDeg/unit]
Fct( Y ) -0.104144E+00 0.478455E-05
Fct( XY ) 0.268685E-02 0.344403E-03
R square = 0.10000E+01
Dec. is toward x<0
Approx. Pos.Angle: 3.98
Approx. plate scale: 5394.184 miliarcsec per Pixel or Micron
Row No Mag Measured Catalogue Deviation
<-> <----> <--> <---RA---> <---Dec--> <---RA---> <---Dec--> -X-arcsec-Y-
4 4 12.0 91641.826 -351929.89 91641.821 -351929.54 0.053 -0.357
5 5 12.0 91640.497 -3516 9.89 91640.499 -351610.81 -0.031 0.914
6 6 12.0 91632.719 -351216.37 91632.739 -351216.24 -0.254 -0.134
7 7 12.0 91614.109 -351257.62 91614.099 -351257.35 0.125 -0.273
8 8 12.0 91613.510 -351345.29 91613.480 -351344.76 0.363 -0.537
9 9 12.0 916 2.399 -351349.74 916 2.421 -351349.87 -0.267 0.121
11 11 12.0 91547.859 -35 951.40 91547.831 -35 951.87 0.345 0.474
13 13 12.0 91545.606 -351219.10 91545.619 -351218.69 -0.159 -0.402
14 14 12.0 91534.194 -351254.53 91534.211 -351254.65 -0.218 0.113
19 19 12.0 91510.653 -352324.14 91510.649 -352324.22 0.043 0.078
RMS in X-direction (arcsec): 0.231
RMS in Y-direction (arcsec): 0.443
Rotator = 180deg
*- X-Transformation
No of data = 9 No of variables = 4
Constant term = -0.16137123E+00
Variable Coefficient Variation of coefficient
Fct( X ) -0.136449E+00 0.308979E-05 [mDeg/unit]
Fct( Y ) 0.149629E+01 0.606479E-06
Fct( XY ) 0.209596E+00 0.606834E-04
R square = 0.10000E+01
R.A. is toward y>0
Approx. Pos.Angle: -84.79
Approx. plate scale: 5386.636 miliarcsec per Pixel or Micron
*- Y-Transformation
No of data = 9 No of variables = 4
Constant term = -0.11302590E+00
Variable Coefficient Variation of coefficient
Fct( X ) 0.156826E+01 0.230264E-04
Fct( Y ) 0.152148E+00 0.451973E-05
Fct( XY ) -0.102789E+01 0.452237E-03
R square = 0.10000E+01
Dec. is toward x>0
Approx. Pos.Angle: 5.54
Approx. plate scale: 5645.743 miliarcsec per Pixel or Micron
Row No Mag Measured Catalogue Deviation
<-> <----> <--> <---RA---> <---Dec--> <---RA---> <---Dec--> -X-arcsec-Y-
1 1 0.0 91656.780 -352354.01 91656.780 -352354.02 0.005 0.015
2 2 0.0 91547.396 -353432.61 91547.400 -353432.52 -0.050 -0.090
3 3 0.0 91613.777 -353347.37 91613.770 -353347.66 0.088 0.287
9 9 0.0 91531.957 -3535 9.31 91531.970 -3535 9.28 -0.159 -0.027
10 10 0.0 91525.516 -353419.88 91525.510 -353418.95 0.071 -0.928
12 12 0.0 91519.617 -3530 8.93 91519.610 -3530 8.57 0.082 -0.358
13 13 0.0 91514.504 -353236.57 91514.520 -353237.03 -0.197 0.465
14 14 0.0 91511.748 -353319.47 91511.760 -353319.87 -0.142 0.399
16 16 0.0 915 8.275 -353421.52 915 8.250 -353421.76 0.311 0.240
RMS in X-direction (arcsec): 0.159
RMS in Y-direction (arcsec): 0.435
The transformation parameters are listed in 0.001 deg/encoder unit.
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