To display a moving target AOR, select an AOR (preferably one that corresponds to the target you are currently displaying) listed in the “Observations” window. Then, select AORs on “Current Image” from the “Overlays” menu on the HSpot main menu bar. You will be asked if you want to plot the same visibility date for the moving target that you currently have plotted (Figure 19.9, “Moving target AOR overlay”). If you don't want to do that, select "No", and you will be asked to supply a different date. Your requested AOR will appear on the image, and a set of icons associated with that display will appear on the right-hand side of the image window (layer controls). As for the layer controls, the icon will toggle the display of the AOR, the icon will delete the AOR display, and the icon opens a table that lists all the AOR pointings. Individual pointings can then be selectively toggled on/off in the table. This window also gives the position angle for the AOR on the date specified. Furthermore, this window allows animation of the AOR - displaying the instrument aperture pointings in the sequence that they will be executed on-board the spacecraft. The "Animation" button shows the pointings, one after the other, and the "Animation w/Trail" button shows the successive pointings, but leaves a trail showing the apertures for all previous pointings in the sequence.

Figure 19.9.  When attempting to overlay AORs on an image for a moving target, this dialogue appears indicating that the track for the target is already plotted on the image and asking whether or not to use the current moving target date.

Multiple AORs for the same moving target can be displayed (e.g., a SPIRE and a PACS AOT). You may wish to check-off the previous AOR using the icon (but not remove, which is done by clicking on the icon) when doing this, to clearly see the new AOR overlaid.