STScI Logo

Hubble Space Telescope
STIS Software Tools

Tools for planning STIS observations

The STIS Exposure Time Calculators (ETCs) are online tools that predict the count rates and S/N in various observing modes given specified source characteristics.

The Target Acquisition Simulator (TAS) applies the actual STIS target acquisition algorithm to a user supplied image.

The Astronomer's Proposal Tool (APT) is the general proposal planning tool for all HST instruments. The Bright Object Tool (BOT) in APT is now availble for STIS CCD and STIS MAMA observations.