An open association of Institutes and Laboratories willing to collaborate in the exploitation and development of long baseline interferometry.

The European Interferometry Initiative (Eii) is an open association of Institutes and Laboratories willing to collaborate in the exploitation and development of optical long baseline interferometry in optical/infrared astronomy. The Eii confederates the activities included in the European Commission instruments of the 6th, 7th and H2020 R&D program, including the most recent Optical/RadioNet Pilot Program. The current Eii activities are:

  • The establishment of a network of VLTI expertise centres across Europe
  • A joint research activity preparing for the third generation of VLTI instruments
  • The Fizeau staff exchange programme
  • The organisation of VLTI training summer schools and VLTI open days

Funding for the activities was obtained through the OPTICON/RadioNet Pilot Program (2021-2024; grant agreement 101004719), OPTICON - the Optical Infrared Co-ordination Network for astronomy - Horizon 2020 (2017-2020, grant agreement 730890), OPTICON FP7 II (2013-2016, grant agreement 312430), OPTICON FP7 (2009-2012, grant agreement 226604), ONTHEFRINGE (2006-2008: grant MSCF-CT-2005-029954) and OPTICON FP6 (2002-2006, RII3-Ct-2004-001566).

The MoU and Management composition can be found here.


This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 101004719. This material reflects only the authors views and the Commission is not liable for any use that may be made of the information contained therein.



OPTICON/RadioNet Pilot Program

Under H2020-INFRAIA-2018-2020, the European Commission approved the new project OPTICON/RadioNet Pilot (ORP), which mobilizes the two flagship communities of advanced radio and optical/infrared astronomy.

2023 NEON Observing School

The 2023 NEON Observing School will be held at the Astrophysical Observatory of Asiago, Italy from the 29th of October to the 10th of November, 2023. As of Friday, the 11th of August, applications have closed.

Fizeau Grants

Fizeau grant applications are now being accepted until November 15. Grants are awarded for the February to July 2024 period. Documentation and rules can be found under the Fizeau program banner.