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STScI Software

  • Astronomer's Proposal Tool

    Astronomer's Proposal Tool

    Used to write, validate and submit proposals for the Hubble Space Telescope and the James Webb Space Telescope.

  • Exposure Time Calculator

    Exposure Time Calculator

    Assists Hubble astronomers and engineers in preparing Phase I and Phase II observing proposals for submission to the Space Telescope Science Institute (STScI).


Additional Software Tools

Name Description
DrizzlePac DrizzlePac is a software package for aligning and combining HST images, bringing an array of new features and algorithmic improvements over the prior, widely-used MultiDrizzle software.
Hcompress An image compression package used to compress the STScI Digitized Sky Survey and has also been used to compress the preview images in the Hubble Data Archive.
HSTaXe HSTaXe is a Python package to extract spectra from all slitless spectroscopy modes provided by the Hubble Space Telescope Wide Field Camera 3 (WFC3) and the Advanced Camera for Surveys (ACS). It supports the features provided by the previous IRAF-based aXe package.
OPUS Telemetry processing system that converts the incoming telemetry from the Hubble Space Telescope into standard output. OPUS software is based on the blackboard architecture and, as a result, is highly robust and portable.

Installation Instructions  |  User's Guide  |  Document Index
Percy An interactive computer program which provides ephemeris and geometrical event information about solar system objects.


pysynphot simulates photometric data and spectra as they are observed with the Hubble Space Telescope (HST). It is an object-oriented replacement for STSDAS SYNPHOT synthetic photometry package in IRAF.
Spike A multi-mission planning and scheduling system used for HST and other astronomical missions.