The Astronomer's Proposal Tool (APT) contains a Visual Target Tuner (VTT). This tool displays HST instrument apertures superimposed on FITS format sky images; Digitized Sky Survey (DSS) images, NASA/IPAC Extragalactic Database (NED) images, or other suitable FITS images. The image viewer has some standard features such as pan, zoom, and gray scale control. The user can measure sky coordinates from the image, as well as overlay and relocate an aperture map, adjusting both the position and orientation angle by clicking and dragging. The APT/VTT also has some advanced features that will automatically compute the allowed orientating angles for given exclusion and inclusion areas which are defined graphically. Figure 3.2 captures the main display for the APT/VTT. For a more detailed discussion of the APT/VTT, go to the VTT web page at:
http://apt.stsci.edu/vtt/
Figure 3.2: APT/VTT Main Display
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