SSC Home Page
Spitzer Science Center
Need Data? Use the Spitzer Heritage Archive (SHA)
When can my AORs be observed?

The quick method

  1. Start up Spot. Load your AORs or create a target list including the target in question. For this example, we choose the star "T Tauri" as observed with IRAC.
  2. Obtain the visibilities of your target as follows. From the target window (or any of several other places), click on "visibility/orientation". (see also "important notes" at end)

  3. The target window

    The visibilities for T Tauri

  4. Note when the windows are for your observing cycle. For Cycle-4, T Tauri is visible to Spitzer 2007 Sep 19 through 2007 Oct 28, and 2008 Feb 29 through 2008 Apr 07.
  5. We schedule starting about 5 weeks out (see How Spitzer Scheduling Works), and schedules are finalized about 3-4 weeks out. Watch the observing schedules page to see what is posted. (If you're the PI or TC of the program, you will get email when the schedule including your AOR is approved.)

Additional Important Notes

  1. You can calculate visibility windows for everything using the 'Calculate Visibility Windows for All' option under the Targets pull-down menu. You can write this out to a file using the 'Save Target Visibility Windows' option from the File menu.
  2. The target visibility windows do not take into account the effects of the slews within your AOR. For a more accurate visibility window for a particular AOR, open the AOR dialog and select the 'Vis Window' button at the bottom of the dialog. This will calculate the visibility window taking into account all positions observed in the AOR. This is particularly important for large maps or cluster target AORs with target positions at significant distances from each other. These can create changes in the visibility window of days to up to a week with respect to that calculated just for your original target position.
  3. If, for example, this observation is not scheduled during the first visibility window, then it is extremely likely that it will be scheduled during the second window. If something happens and for whatever reasons it does NOT get observed during the second window, it is likely that the observation will be executed during the next available window.
  4. If your target is in the continuous viewing zone (CVZ), it may be scheduled at any time during the Cycle.