Other
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9355k&link_type=abstract
HST Proposal ID #9355
Other
Hst Proposal Id #9355
Scientific paper
Several camera/filter combinations of HST do not sample the point spread function with a sufficiently small sampling interval to retrieve the full spatial resolution possible at the wavelength of the filter. This is especially true for the NIC3 camera. Dithering observations by sub-pixels is the standard solution. However, the extra overhead time of dithering can be too long to make dithering feasible for many solar system targets where rotation or relative motion is noticeable during the overhead time. I suggest to test a new method where a single exposure yields 13-22 dithered images which provide sufficient subpixel information to recover the whole spatial capabilities of HST. I suggest to test this method with Jupiter imaged by six NIC3 filters. Still exposures in the same six filters of NIC1 or NIC2 will be added to provide the standard for comparison of spatial resolution. The method lets Jupiter smear across NIC3 by about 4-6 pixels during the whole exposure by c hanging HST's tracking rates. Each interval between readouts of NIC3 provides a dithered image. It is difficult to predict how well the reduced NIC3 images will compare with the still NIC1 and NIC2 images with respect to spatial resolution, but one orbit of HST can test the method. If this method works well, it could be applied to many other future observations.
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