Planetary satellite and other observers may wish to display not only their science target, but also the relative position of a nearby moving target (e.g., the parent planet for a satellite). You should enter the second target into HSpot via the target entry window (see Section 8), so that it appears in your HSpot target list.

After displaying your primary science target, go to the “Overlays” menu on the HSpot top menu bar and select “Add Moving Target” (see Section 5.8.4). HSpot will then display the target list for you from which to choose your second target. Once selected, it will be plotted on the same image as your first target, over the date range initially specified for the first target, and with the same date points used for the first target.

If your second target does NOT cross the image in the date range specified for the first target, HSpot will display a window to that effect, and ask you whether you would like to see the position of the second target relative to the first on an all sky image. The sky patch labelled "Sky Image" will show the image area that contains your first target, and your second target will be labelled by name, elsewhere on the all sky image.