The Call for Proposals describes the policies and procedures for submitting a Phase I proposal for HST Observing, Archival or Theoretical Research. Please read our guide to the use of electronic document formats.
Up to 10% of the available HST observing time may be reserved for Director's Discretionary (DD) allocation.
- Frontier Fields
- Cycle 21 Call for Proposals
- HST Primer
- Science Justification Templates
- Status of current and Past Treasury,
Archival Legacy and Large Proposals
- Multi-Cycle Treasury Programs Call for Proposals
- Phase II Instructions
- HST Documents