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Thomas Bensby. Profile photo.

Thomas Bensby

Senior lecturer

Thomas Bensby. Profile photo.

4MOST : The 4-metre Multi-Object Spectroscopic Telescope project at preliminary design review


  • Roelof S. De Jong
  • Samuel C. Barden
  • Olga Bellido-Tirado
  • Joar G. Brynnel
  • Steffen Frey
  • Domenico Giannone
  • Roger Haynes
  • Diana Johl
  • Daniel Phillips
  • Olivier Schnurr
  • Jakob C. Walcher
  • Roland Winkler
  • Wolfgang R. Ansorge
  • Sofia Feltzing
  • Richard G. McMahon
  • Gabriella Baker
  • Patrick Caillier
  • Tom Dwelly
  • Wolfgang Gaessler
  • Olaf Iwert
  • Holger G. Mandel
  • Nikolai A. Piskunov
  • Johan H. Pragt
  • Nicholas A. Walton
  • Thomas Bensby
  • Maria Bergemann
  • Cristina Chiappini
  • Norbert Christlieb
  • Maria Rosa L. Cioni
  • Simon Driver
  • Alexis Finoguenov
  • Amina Helmi
  • Michael J. Irwin
  • Francisco Shu Kitaura
  • Jean Paul Kneib
  • Jochen Liske
  • Andrea Merloni
  • Ivan Minchev
  • Johan Richard
  • Else Starkenburg


  • Luc Simard
  • Christopher J. Evans
  • Hideki Takami

Summary, in English

We present an overview of the 4MOST project at the Preliminary Design Review. 4MOST is a major new wide-field, high-multiplex spectroscopic survey facility under development for the VISTA telescope of ESO. 4MOST has a broad range of science goals ranging from Galactic Archaeology and stellar physics to the high-energy physics, galaxy evolution, and cosmology. Starting in 2021, 4MOST will deploy 2436 fibres in a 4.1 square degree field-of-view using a positioner based on the tilting spine principle. The fibres will feed one high-resolution (R∼20,000) and two medium resolution (R∼5000) spectrographs with fixed 3-channel designs and identical 6k x 6k CCD detectors. 4MOST will have a unique operations concept in which 5-year public surveys from both the consortium and the ESO community will be combined and observed in parallel during each exposure. The 4MOST Facility Simulator (4FS) was developed to demonstrate the feasibility of this observing concept, showing that we can expect to observe more than 25 million objects in each 5-year survey period and will eventually be used to plan and conduct the actual survey.


  • Lund Observatory - Has been reorganised

Publishing year





Proceedings of SPIE - The International Society for Optical Engineering



Document type

Conference paper




  • Astronomy, Astrophysics and Cosmology


  • Euclid
  • Facility simulator
  • Fibre-fed spectrographs
  • Gaia
  • Science operations
  • Tilting-spine fibre postioner
  • VISTA telescope
  • Wide field corrector
  • Wide-field multi-object spectrograph facility

Conference name

Ground-Based and Airborne Instrumentation for Astronomy VI

Conference date

2016-06-26 - 2016-06-30

Conference place

Edinburgh, United Kingdom




  • ISSN: 1996-756X
  • ISSN: 0277-786X
  • ISBN: 9781510601956