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.

EAS2023 - LS7

We are proud to announce a special (lunch) session at the EAS2023 on The ESO Very Large Telescope Interferometer window into the universe: a hands-on session for newbie. The EAS2023 will be held in Krakow, Poland from the 10th-14th July 2023.

2023B ORP-supported call for optical/IR telescope observing time

We are pleased to announce that the 2023B call for observing time at optical/IR telescopes supported by the OPTICON-Radionet Pilot (ORP) project is now open.

11th VLTI Summer School

The 11th VLTI Interferometry School will be held on 12-17 June 2023 in Budapest. The registration is now open until March 15, 2023.