Moving Target Stray Light Considerations

PLACEHOLDER-DO NOT DELETE!

There will be strategies to handle planets impinging on an FGS during science observations of a satellite.

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Stray light

Show a couple of examples of PSFs convolved with Jupiter's disk...

FGS impingement by planets

One concern for observers of satellites around bright planets will be "impingement," when the limb of the planet encroaches on the FGS field-of-view to any extant.  In some cases the the stray light could compromise the science observation. 

Figure 1. 


Example of FGS impingement, where Titan is the target in the NIRSpec IFU and Saturn is impinging on FGS1. GET A BETTER FIGURE: MAIN NIRSPEC FOV NOT PRESENT. ALSO HARD TO READ: REDUCE NUMBER OF SATELLITES PRESENT, CENTER THE FIELD, GET RID OF WHITE SPACE.
Figure 2. 


Fractions of total observable time that the primary of a satellite is impinging on either FGS1 (top) or FGS2 (bottom) using NIRCamA. WHY NOT THE SAME SATELLITES IN BOTH BAR GRAPHS? WHY NOT MORE COMMONLY OBSERVED SATELLITES (GALILEAN SATELLITES, TITAN, ENCELADUS, CLASSICAL URANIAN SATELLITES, TRITON, ETC.)? OR PROVIDE GRAPHS FOR ~10 SATELLITES FOR EACH PLANET, WITH DIFFERENT COLORS FOR THE 2 FGS FOVS.


References





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