Call for Proposals

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.

• PDF [US Letter Size]
• PDF [European A4 Size]
• HTML

DD Time

Up to 10% of the available HST observing time may be reserved for Director's Discretionary (DD) allocation.

• DD Submission
• Real-time list of all Approved DD Programs

Shortcuts

• Frontier Fields
• Cycle 21 Call for Proposals
• HST Primer
• Science Justification Templates
• APT
• Status of current and Past Treasury,
  Archival Legacy and Large Proposals
• Multi-Cycle Treasury Programs Call for Proposals
• Phase II Instructions
• HST Documents

Scheduling Considerations

• Special Opportunities