Welcome to the Astronomer's Proposal Tool (APT) User Guide for the Roman Space Telescope! APT is used to define observations for the Roman Mission. 

If you want a guide to plan an observation now...

Visit the APT Quick Start Guide to begin immediately with basic instructions.

If you know APT from HST or JWST proposals...

Take a look at the How is APT different for Roman? article to learn more about the unique properties of APT designed for the Roman Mission. 

If you are new to APT...

Start with the Astronomers Proposal Tool (APT) overview and the other detailed documentation to learn more about this tool and how to use it. 

Roman APT User Guide List of Contents

• Quick Start Guide
• How is APT different for Roman?
• Astronomers Proposal Tool (APT)
  • APT Program Elements
  • Program Information
  • Targets
    • Fixed Targets
      • Target Importer
      • Fixed Target Resolver
    • Region Targets
  • Mosaic Patterns
    • Tiles
  • Pass Plans
  • Survey Plan
  • Special Requirements
    • Calibration
  • Execution Plans
  • Visit Planner
  • Submission
  • Future Developments for Roman APT
  • Appendix
    • Appendix: WFI Dithering
    • Appendix: WFI MultiAccum Tables

For additional questions not answered in this article, please contact the Roman Help Desk at STScI.