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** THE CALL has now closed **

The next opportunity for submitting proposals will be via the discretionary Programme, details of
​​​​​​​which can be found on the appropriate webpage.

Please contact the ESA project scientist via cheops-support @ cosmos.esa.int to check the status
​​​​​​​of your ​​​​​​​proposed target before submitting a proposal.

Updated 1 december 2020



SECOND Announcement of Opportunity (AO-2) for participation in the CHEOPS Guest Observers Programme


This announcement solicits proposals for observations to be carried out as part of the CHEOPS Guest Observers Programm,  and covering the period of March 26 2021 to March 25 2022



Release of AO-2: call for Phase I observing proposals           4 November 2020

Deadline for submission of Phase I observing proposals        1 December 2020 (13:00 CET/12:00 GMT)

Meeting of the CHEOPS Time Allocation Committee              2 - 4 February 2021

Announcement of award of observing time on CHEOPS         by 19 February 2021

Preparation of Phase II inputs                                            25 February - 10 March 2021

Start of Year 2 of CHEOPS                                                 26 March 2021



Important Notes:

Prospective observers are requested to take note of the following points:

  • All proposals must be submitted via the Phase I Proposal Handling Tool. Submission requires the use of a Cosmos Website ID together with membership of the CHEOPS Guest Observers Programme Group. Registration is required to download the software for the Scheduling Feasibility Checker, which is one of the tools needed to prepare proposals (see notes below) and also to download simulated CHEOPS data. Requests for both IDs and group membership need to be made by following the instructions at the following link:  https://www.cosmos.esa.int/web/cheops-guest-observers-programme/register

         We recommend that you get an ID/register early during the call.


Last updated:  24 November 2020


Key Documentation:


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

Tools and supporting manuals:


​​​​​​​useful presentations, reference data and links    


User-contributed tools/aids:

Here we provide links to documentation that has been deveolped by members of the CHEOPS Science Team. These are shared for use at the user's own risk, with caveats and warnings that are detailed in the individual documents.