On 6/07 Micheal Connelley did moris engineeing: Here is MC's report: MORIS_platescale.pdf 1. Measured Moris's Platescale: 0.1141 as/pixel. 2. Spex's platescale is actually: 0.1156 as/pixel. 2. Map Spex's Pixel's to Moris Pixel. Spex XY located can be map to moris via 2D translation using: Transpose XY: 61 44 Scale XY: 1.01315 1.01315 Rotate : 1.2 degs s.txt are spex centroids from 10 stars in ngc6366.spex.0002.a.fits. m.txt are moris centroids 10 stars in from ngc6366_0062.a.fits.t.c is code to rotate, scale, transpost to get s.txt close to m.txt. Transpose spex XY by tx=-256, tx=-256. Transpose data by t_x=61, t_y=44, scale_x=1.01315, scale_y=1.01315, rotate=1.2 deg Transpose data XY by tx=+256, tx=+256. Resulting data is written to x.txt.
plot.png shows m.txt vs x.txt where m.txt is moris position. x.txt is spex's translated position. Here are the gnuplot command to make the plot: set yrange [0:512] set xrange [0:512] plot 'm.txt' using ($2):(512-$3) with line replot 'x.txt' using ($2):(512-$3) with line