On-Orbit Photometric Calibration of the WFPC2 Linear Ramp Filters

Details On-Orbit Photometric Calibration of the WFPC2 Linear Ramp Filters On-Orbit Photometric Calibration of the WFPC2 Linear Ramp Filters

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009wfpc.rept....6b&link_type=abstract

Instrument Science Report WFPC2 2009-06, 67 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wfpc2

Scientific paper

As part of the WFPC2 close-out calibrations, we have revised the SYNPHOT throughput curves for the linear ramp filters using on-orbit photometry of a standard white dwarf, EGGR-102 (GRW +70 5824). Comparison of the new on-orbit data and previous groundbased calibrations show differences up to ~20%. The accuracy of the new throughput table is expected to be ~2% at most wavelengths, though as noted herein, some wavelengths with limited or no on-orbit data will have poorer accuracy. The new ramp filter throughput file has been delivered to CDBS and will be used in reprocessing the WFPC2 archive.

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