Transform_Process_Set Pointing Mask Analysis and Problems
During the analysis of LUCI pointing mask, two plots will be displayed showing the fitting of the pointing mask point circle. The first plot is the original full set of sources in the pointing circle anulus. The second quickly displays each iteraion of source removal with the last displayed image showing the final point circle fits used to correct the on-axis stellar source.
If there are problems with analysis, for example the point circle not found, there may not be enough sources found to perform the circle fit, The flag to the transform_process_set, PEAK=[min,max], can be used to change the range of sources (point circle sources) inclueded in the analysis. The sources used are chosen in an anulus where the point circle should be located. A circle is fit to the anulus of sources, the source with the largest fit error is removed and the circle fit performed again. This fit/remove process is iterated until all fit errors are lower than some limit.
Note, if there is a problem with the point mask fitting, The pointing mask image can be viewed via the command
% ds9 ../reduced/luci1.20200108.0019_reduced.fits &
- 30 Jan 2020