Due to some planned IT maintenance activities, ESO services related to Phase 2 and follow-up of observing programmes may be intermittently unavailable on April 21-22. We apologize for the inconvenience.

Service Mode Special Procedures

There are some special procedures for service mode observations in the following cases:

ESO Public Surveys
Director's Discretionary Time (DDT) programmes
Target of Opportunity (ToO) programmes
Rapid Response Mode (RRM) observations
Observations of Moving Targets
Use of special non-ESO user filters

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ESO — Reaching New Heights in Astronomy

Service Mode Special Procedures

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