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
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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.
ASTROM Basic astrometry program