The ESO Science Archive Facility (SAF) contains, and provides access to, data from ESO telescopes at La Silla Paranal Observatory, including the APEX submillimeter telescope on Llano de Chajnantor. All raw data from the La Silla Paranal Observatory are stored together with the corresponding calibrations, as well as selected products both contributed by the community or generated at ESO. Processed data downloaded from the ESO Archive are assigned a Digital Object Identifier (DOI). The list of the DOIs currently available can be found here. In addition, the raw UKIDSS/WFCAM data obtained at the UK Infrared Telescope facility in Hawaii are available in the ESO Archive.

The Principal Investigators of successful proposals for time on ESO telescopes have exclusive access to their scientific data for the duration of a proprietary period, normally of one year, after which the data becomes available to the community at large. Please read the ESO Data Access Policy statement for more information, along with the relevant FAQs.

Browsing the archive does not require authentication. Please acknowledge the use of archive data in any publication.

There are various ways to access the archive, varying for content and presentation/interface: via a web browser, the Raw Data query form gives access to the  raw frames and their calibrations, the Science Portal allows to browse and access the processed data, and the Catalogue Facility to browse and access the catalogue data produced by PIs of ESO programmes; the Programmatic and Tools access layer permits direct access to the raw and process data and metadata, to the ambient condition measurements, and to the catalogues, in a scriptable and VO-compatible manner. Other query forms are available in the table at the bottom of this page.