Exposure Time Calculators
Advanced Camera For Surveys (ACS) ETCs
Supported modes: imaging, ramp filter, spectroscopy and special coronographic imaging and ramp filter modes.
Cosmic Origins Spectrograph (COS) ETCs
Spectroscopy, imaging and (imaging) target acquisition are currently offered.
Near Infra-red Camera & Multi-Object Spectrometer (NICMOS) ETCs
Grism spectroscopy and imaging modes are currently supported.
Space Telescope Imaging Spectrograph (STIS) ETCs
Imaging, spectroscopy and target acquisition are currently offered.
Wide Field Camera 3 (WFC3) ETCs
Imaging and spectroscopy ETCs are currently offered for both the UVIS and IR channels.
ETC News
COS - 11 Dec 2007
The throughput tables for MIRRORB have been updated. If you plan on using this setting in an imaging calculation, you should rerun your exposures.
STIS - 14 Jan 2008
For CCD observations at shorter wavelengths (especially with G230LB/G230MB spectroscopy): A defect in the ETC disabled the count-rate adjustment for the 2-photon effect that occurs below 4,000 angstroms. You may wish to rerun your exposures.
