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Lego Figure holding a lego telescope. Photo

Arne Ardeberg

Professor emeritus

Lego Figure holding a lego telescope. Photo

Status of the Euro50 project


  • Torben Andersen
  • Arne Ardeberg
  • Holger Riewaldt
  • M. Lastiwka
  • N. Quinlan
  • K. McNamara
  • Xin Wang
  • Anita Enmark
  • Mette Owner-Petersen
  • A Shearer
  • Chengyu Fan
  • Dan Moraru

Summary, in English

The Euro50 is an extremely large telescope for optical and infrared wavelength with a 50 m primary mirror. It has a segmented, aspherical primary mirror and an aspherical, deformable secondary in a Gregorian layout. A tentative conceptual design exists and has been documented in a study report. Recent activities have concentrated on the science case for extremely large telescopes in the 50 m class and on identification of potential technical "show stoppers". The science case investigation has identified four fields of particular interest. The studies of critical technical issues have concentrated on atmospheric dispersion effects for high-resolution adaptive optics for extremely large telescopes, and on the influence of wind and other disturbances on wavefront control. Wind load on the telescope, the primary mirror and the enclosure has been studied using wind tunnel measurements and computational fluid dynamics. The impact of wind on the total system has been investigated using an integrated model that includes the telescope structure, the primary mirror segment alignment system, the secondary mirror alignment system, and single conjugate adaptive optics using the deformable secondary mirror. The first, tentative results show that wind disturbances may be significant and that the task of correcting for wind residuals may be at least as large for the adaptive optics system as that of correcting for atmospheric aberrations. The results suggest that use of extremely large telescopes for observations of earth-like planets around nearby stars may imply a considerable challenge


  • Lund Observatory - Has been reorganised

Publishing year







Proceedings of the SPIE - The International Society for Optical Engineering





Document type

Conference paper




  • Astronomy, Astrophysics and Cosmology


  • segmented aspherical primary mirror
  • atmospheric dispersion effects
  • wavefront control
  • high-resolution adaptive optics
  • wind tunnel measurements
  • wind load
  • computational fluid dynamics
  • primary mirror segment alignment system
  • 50 m
  • secondary mirror alignment system
  • deformable secondary mirror
  • exoplanet detection
  • integrated modeling
  • Euro50
  • Extremely Large Telescopes

Conference name

Ground-Based Telescopes

Conference date

2004-06-21 - 2004-06-25

Conference place

Glasgow, United Kingdom




  • ISSN: 1996-756X
  • ISSN: 0277-786X