Warning!!

On 29 September 2022 between approximately 08:00 and 08:30 CEST the ESO Archive Science Portal may be available with reduced functionality due to IT maintenance. Request submission and data download via the Request Handler will not be possible on the same day between 08:00 and 09:00 CEST. We apologize for any inconvenience.

We have recently uncovered a bug in the delivery software that started to be in use as of February 2020, which led to the possibility that the incorrect copy of 561 files have been downloaded. Please check here.

ESO Archive Frequently Asked Questions

What is the maximum number of files I can submit as a request?

The maximum number of files that can be requested is currently 20000 files per request.