Other
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9526k&link_type=abstract
HST Proposal ID #9526
Other
Hst Proposal Id #9526 Solar System
Scientific paper
The WFPC2 filter FQCH4N-D {890 nm} has probably a spatially variable transmission curve. This is estimated to cause photometric inconsistencies across the field of view of up to 30 percent, much larger than for other WFPC2 filters where flatfields describe the spatial photometric variation to better than 0.3 percent consistency according to the WFPC2 Handbook. This undocumented feature of FQCH4N-D affects a number of investigations with HST since this is one of the WFPC2 filters most often used for solar system studies. More than 600 images have been taken with FQCH4N-D. During Cycle 10, observations of Saturn with this filter will quantify the spatial variation of the filter transmission characteristics. I propose to analyze those observations and to provide the size and the direction of the effect, as well as estimates on how this may affect photometry based on imaging of giant planets and Titan with this filter. Similar data is published for ultraviolet filters with red leaks but still missing for FQCH4N-D. I successfully completed two previous investigations for the calibration of WFPC2.
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