CHEOPS Guest Observers Programme

20% of science observing time on CHEOPS is made available to the scientific community to conduct investigations of their choice in the form of an ESA-run Guest Observers’ (GO) Programme. Proposals for GO Programme observing time will be solicited through a series of annual Announcements of Opportunity (AOs). In order to allow new targets to also be included in the GO programme at any time during the mission, up to 25% of the open time will be allocated as Discretionary Time (DT), as part of the Discretionary Programme. This will be overseen by ESA, in consultation with the chair of the TAC and the CHEOPS PI.

On this website we provide the links to key information relevant to prospective users of CHEOPS.

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The third annual announcement of opportunity (AO-3) for participation in the CHEOPS Guest Observers Programme was due to open on 9 November 2021. The AO has been postponed and is currently foreseen to come out in early 2022. Once available the timeline will be circulated widely and also posted on this webpage

In the meantime, there are several documents, tools and webpages available to help you to familiarise yourselves with the capabilities of CHEOPS. Details of these can be found on the following webpage: 
https://www.cosmos.esa.int/web/cheops-guest-observers-programme/ao-3

The Discretionary Programme remains open, with further details available at: 
https://www.cosmos.esa.int/web/cheops-guest-observers-programme/discretionary-programme

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The results of previous Calls can be found here (AO-1: end March 2020 - March 2021; AO-2: end March 2021 - mid March 2022).

Observing time on CHEOPS is currently available through the Discretionary Programme - further details of the programme and how to apply can be found here.

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Questions? Send an email to the ESA CHEOPS Project Scientist at  kate dot isaak at esa.int, replacing the " dot " and the " at " with a "." and "'@" respectiviely