... Virtual Observatory . Virtual Observatory systems . The Virtual Observatory Systems (VOS) Department of the ESO Data Management and Operations Division is based in Garching bei MЭnchen, Germany. Its main mission is to make the Science Archive Facility (SAF) into a powerful scientific resource for the ESO community and coordinate ESO?s involvement in Virtual Observatory (VO) activities, building on the success of the AstroVirtel and Astrophysical Virtual Observatory projects. ...