CHEOPS Discretionary programme


Last update 17 JULY 2022

This webpage provides prospective users of CHEOPS with all information (policies and procedures for the programme, documentation, tools and links)  required to prepare and submit proposals to the CHEOPS Discretionary Pragmme, through which 5% of the nominal science observing observing time on CHEOPS will be allocated.

To be eligible for the Discretionary Programme a proposal must meet the following criteria:

  • Contain a single target of high scientific interest
  • Demonstrate that the target was either (a) discovered, or (b) declared to be of high scientific interest since the close of the previous call (15 March 2022)
  • Contain a target/event that is observable by the date by theend of the nominal mission  (24 September 2023), and that is not on the CHEOPS Reserverd Target List
  • It is noted that the requirement to be either newly discovered or newly determined tobe of high scientific interest since the close of AO-3 (i.e  15 March 2022) is waived for proposals led by PhD students (as part of their PhD work) and/or early career researchers within 2 years of the award of their PhD.

Details regarding what needs to be included in a proposal, together with the tools and documentation to support proposal preparation and submission, can be found in the Policies and Procedures document for the Discretionary Programme. Prospective observers are STRONGLY RECOMMENDED to read very carefully through this document before starting work on any proposal. 


Important Notes:

In case of questions, please send an email to,  or kate dot isaak at, replacing the " dot " by "." and " at " by "@".


Key Documentation:


A number of tools, documents, presentations and links are available to help you with your proposal preparation and submission.

Tools and supporting manuals:

Useful presentations, reference data and links    

User-contributed tools/aids:

Below are links to tools that have been developed by members of the CHEOPS Science Team and the CHEOPS Consortium to aid preparing and analysing CHEOPS observations. These are shared for use at the user's own risk, with caveats and warnings that are detailed in the individual documents.



Please check the Frequently Asked Questions page for common questions as well as details of who to contact in case your question is not answered on the page.