This page presents revised calculations of the aperture corrections published in
Sirianni et al. (2005, hereafter S05). Tabled corrections on this page are from
Bohlin's ISR-II (2011)
and ISR-IV (2012).
Encircled Energy fractions for K type and hotter stars
in 0.5" and 1.0" apertures.
Encircled Energy within 0.5" for very cool stars as a function of spectral type. The recommended
values are flagged with an asterisk. For spectral type + filter combinations with no asterisk,
use the hot star values in column 2, which are copied from Table 1.
As for Table 2, except that the Encircled Energy fractions are for a 1.0" aperture.
Table of WFC Encircled Energy corrections from
Table of HRC Encircled Energy corrections from
Bohlin, R. C. 2011,
Instrument Science Report, ACS 2011-02, (Baltimore:STScI)(ISR-II)
Bohlin, R. C. 2012,
Instrument Science Report, ACS 2012-01, (Baltimore:STScI)(ISR-IV)
Sirianni, M., et
al. 2005, PASP, 117, 1049S (S05)
Last modified on May 11, 2012.