What Is APT?
The Astronomer's Proposal Tool (APT) is used to write, validate, and submit proposals for the Hubble Space Telescope and the James Webb Space Telescope.
Download and Installation Instructions
Trouble installing APT? Please see Troubleshooting Tips at the bottom of each of these platform specific Installation instructions.
Current Release: 2025.5.3
APT 2025.5.3 was released on September 3, 2025 and is needed by JWST MIRI WFSS proposers.
APT 2025.5.2 was released on August 22, 2025 and is a required update for JWST.
Documentation, Training, and Support
Links to user documentation, training materials, and APT support are provided in the sections below based on the type of proposal being submitted.
HST Phase I
- Filling Out the APT Proposal Form
- Training Videos and Documentation for APT's Tools
- Phase I Roadmap
- HST APT Knowledge Base (FAQ)
- HST APT Support (Help Desk)
HST Phase II
- Phase II Proposal Instructions
- Phase II Specific Training Videos and Documentation for APT's Tools
- Phase II Roadmap
- HST APT Knowledge Base (FAQ)