Table 2: System Efficiencies and Zeropoints
Filter
QTd 
/
QTmax
d/d
p
<>
max
me/sec
twfsky
|
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To be read in conjunction with Section 6.1 of the WFPC2 Instrument Handbook, Version 4.0.Table 2 is an update to Table 6.1 of the WFPC2 Instrument Handbook. New calibration information has caused us to change the estimated efficiencies and throughputs of several of the narrowband and UV filters since the last publication of this table. These numbers are accurate to at least 10%-which is sufficient for planning observations, but not for the analysis of many programs. Investigators wishing to do photometry on WFPC2 images should examine the HST Data Handbook for an explanation of the conventions used in determining WFPC2 zeropoints and should use the zeropoints given in Table 28.1 of the Data Handbook. For the most accurate and up-to-date calibrations you may wish to examine the on-line version of the Data Handbook to make sure that no numbers of interest to you have changed since the last paper publication.
Last updated: 06/16/98 10:38:00