B Example Report

Here is an example of the report produced by ASTROM. It is the result of a run using the specimen input file presented in Section 3. The first part of the report lists the raw data. The second part gives the results of the 4-coefficient solution. The third part (next page) gives the results of the 6-coefficient solution. The fourth part gives the predictions for the unknown stars.

It should be noted that the report file contains Fortran printer codes.

  1* * * * * * * * * * * * *
   *  A S T R O M E T R Y  *
   * * * * * * * * * * * * *
  
  
  
   Equinox for mean coordinates of results:  B1950.0
  
   Projection geometry:  Schmidt
  
   Plate centre:  19 04 00.0   -65 00 00     Equinox B1950.0     Epoch B1974.500
  
  
   Reference stars:
  
                  n              RA            Dec         pmR    pmD   Equinox   Epoch      px         Xmeas        Ymeas
  
                  1         18 56 39.426  -63 25 13.23  -0.0002 -0.036  B1950.0  B1950.000  0.000      +44.791      +85.643
                  2         19 11 53.909  -63 17 57.57  +0.0058 -0.044  B1950.0  B1950.000  0.000      -46.266      +92.337
                  3         19 01 13.606  -63 49 14.84  +0.0020 -0.026  B1950.0  B1950.000  0.000      +17.246      +64.945
                  4         19 08 29.088  -63 57 42.79  +0.0016 +0.018  B1950.0  B1950.000  0.000      -25.314      +57.456
                  5         19 02 10.088  -63 29 16.73  +0.0012 -0.019  B1950.0  B1950.000  0.000      +11.890      +82.766
  1Plate solution: 4-coefficient
   -----------------------------
  
       X,Y = expected plate coordinates (radians)
  
       X =  +0.2328072E-03                            Y =  -0.7392285E-03
            -0.3274547E-03 * Xmeas                         -0.5543943E-06 * Xmeas
            -0.5543943E-06 * Ymeas                         +0.3274547E-03 * Ymeas
  
  
   Xmeas =  +0.7071360                            Ymeas =   +2.258696
             -3053.849     * X                              -5.170293     * X
             -5.170293     * Y                              +3053.849     * Y
  
  
        Plate scale (in measuring units):           67.5425 arcsec
                             Orientation:           +0.097  deg and laterally inverted
  
  
   Reference stars:
                               Mean RA,Dec         Equinox B1950.0      Epoch B1974.500           Residuals (arcsec)
                  n                    catalogue                     calculated                 dX        dY        dR
  
                  1            18 56 39.421  -63 25 14.11    18 56 39.468  -63 25 14.27      +0.319    -0.145     0.350
                  2            19 11 54.051  -63 17 58.65    19 11 54.082  -63 17 58.00      +0.226    +0.638     0.677
                  3            19 01 13.655  -63 49 15.48    19 01 13.580  -63 49 15.88      -0.489    -0.407     0.636
                  4            19 08 29.127  -63 57 42.35    19 08 29.016  -63 57 42.72      -0.738    -0.365     0.824
                  5            19 02 10.117  -63 29 17.20    19 02 10.220  -63 29 16.92      +0.682    +0.280     0.738
  
                                                                                    RMS :     0.530     0.401     0.665

  1Plate solution: 6-coefficient
   -----------------------------
  
       X,Y = expected plate coordinates (radians)
  
       X =  +0.2457761E-03                            Y =  -0.7296778E-03
            -0.3274742E-03 * Xmeas                         -0.5253092E-06 * Xmeas
            -0.7235166E-06 * Ymeas                         +0.3273299E-03 * Ymeas
  
  
   Xmeas =  +0.7455928                            Ymeas =   +2.230379
             -3053.665     * X                              -4.900618     * X
             -6.749697     * Y                              +3055.011     * Y
  
  
       Plate scales (in measuring units):      X    67.5465 arcsec
                                               Y    67.5168 arcsec
                                            mean    67.5316 arcsec
                     Nonperpendicularity:           +0.035  deg
                             Orientation:           +0.109  deg and laterally inverted
  
  
   Reference stars:
                               Mean RA,Dec         Equinox B1950.0      Epoch B1974.500           Residuals (arcsec)
                  n                    catalogue                     calculated                 dX        dY        dR
  
                  1            18 56 39.421  -63 25 14.11    18 56 39.395  -63 25 14.22      -0.174    -0.112     0.207
                  2            19 11 54.051  -63 17 58.65    19 11 54.031  -63 17 58.70      -0.134    -0.047     0.142
                  3            19 01 13.655  -63 49 15.48    19 01 13.633  -63 49 15.48      -0.149    -0.006     0.149
                  4            19 08 29.127  -63 57 42.35    19 08 29.132  -63 57 42.37      +0.034    -0.026     0.043
                  5            19 02 10.117  -63 29 17.20    19 02 10.181  -63 29 17.01      +0.422    +0.191     0.463
  
                                                                                    RMS :     0.224     0.102     0.246
  1Unknown stars:    B1950.0 mean places for epoch B1974.500
  
               :               4-coefficient model               :                6-coefficient model                :
               :   Xmeas    Ymeas          RA            Dec     :   Xmeas    Ymeas          RA             Dec      :
               :                                                 :                                                   :
               :   -5.103  +58.868 -> 19 05 01.697  -63 56 17.13 :   -5.103  +58.868 -> 19 05 01.7942  -63 56 16.702 :
               :   -5.120  +58.862 <- 19 05 01.874  -63 56 17.54 :   -5.111  +58.856 <- 19 05 01.8741  -63 56 17.539 :

The residuals dX and dY are, loosely, in standard coordinates; except at the poles, positive dX means that the measured position of the image lies to the east of the expected position, and positive dY means that the measured position lies to the north of the expected position.

If a 7-9 coefficient fit is requested, and providing there are at least ten reference stars, an extra section of report precedes the unknowns. If the fit is successful, the two solutions used to process the unknown stars are the 6 and 7-9 coefficient ones, and the 4-coefficient model is not used.