Next to the name of the target the coordinates of the target can be added in hexagesimal or degree format. Obviously just one can be chosen, while the other one is blocked out.
The same accounts for the guide star. Here one hast to possibilities: either typing an own guide star or letting the guide finding algorithm propose you stars. The star finding algorith works as following:
- after hitting the "refresh" button, it reads the object coordinates and the position angle (cf. Telescope settings) into temporary variables
- the USNO (will soon be a mixture of SDSS and 2Mass/NOMAD) catalog is queried for the respective field and all stars are plotted into the right handed plot
- the restricitions of the AgW-patrolfield are added to the plot
- the queried objects are tested for their position and all useful object are then given back to the table (the maximum number is 10, if there are more, the 10 brightest are chosen) and are marked and numbered in the plot
- if the stars approach any restriction, they will be flagged (VA - guide too close to vignetting avoidance, TA - guide too close to theta-areas (both-sided lines, GA - guide too close to gregorian avoidance (lower circle), FA - guide too close to field avoidance (upper circle))
- by typing the number of the chosen guide, the guide name is set to the USNO id and the coordinates are added in degree format
Figure:
The different flagged (yellow), forbidden (red/gray) and allowed (green) regions of the agw patrol field. I-Field avoidance (FA),II-Vignetting avoidance (VA), III-Gregorian avoidance (GA), IV-Theta avoidance (TA)
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Dennis Kuegler
2012-10-05
