Proposal Documentation

Cycle 27 Announcement Page

The online authority with the latest information on the current proposing cycle. Learn More

The Call for Proposals

The Call for Proposals describes the policies and procedures for submitting a HST Phase I proposal. Learn More

The Primer

The Primer provides an introductory overview of the Hubble Space Telescope and explains how to calculate the appropriate number of orbits for an observing proposal. Learn More

HST Phase I Roadmap

The Roadmap is a step-by-step guide to proposing and submitting an HST proposal. Learn More   

Science Justification Templates 

PDF Templates for HST Cycle 27 Phase I Proposals. Learn More

Orbital Visibility and Scheduling

Observing considerations, including guidelines, instructions and links to other documents in support of proposal applications.  Learn More


Proposal Calendar

April 5, 2019 at 8:00pm EDT

Phase I Proposal Deadline


June 2019

Cycle 27 Peer Review


July 26, 2019

Phase II proposal deadline


August 8, 2019

Budget Submission Deadline


September 27, 2019

1st Cycle 27 Mid-Cycle Deadline


January 2020

2nd Cycle 27 Mid-Cycle Deadline


Additional Resources

Please Contact the HST Help Desk with any Questions