The GMT telescope metrology system design

Breann N. Sitarski, Andrew Rakich, Hugo Chiquito, Wylie Rosenthal, Antonin H. Bouchez, William Schoenell, Bo Xin, Priscila Pires, Joel Nissen, P. Schurter, Richard T. Demers, Peter Thompson, Brian McLeod, Bijan Nemati, Glenn Brossus, Brian Walls, Heejoo Choi, Guillermo Gonzalez, David Nemati

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations


The Giant Magellan Telescope will be a 25.4-m visible and infrared telescope at Las Campanas Observatory. The optical design consists of 7 8.4-m primary mirror segments that reflect light to 7 secondary mirror segments in a doubly segmented direct Gregorian configuration. GMT is developing a Telescope Metrology System (TMS) to decrease the complexity of alignment and increase observatory efficiency. The TMS has been developed to Preliminary Design Review level. A prototyping, modelling, and analysis effort has been completed. All components of the system were matured, and the edge-sensing strategy was significantly revised. This paper describes the current TMS design.

Original languageEnglish (US)
Title of host publicationGround-Based and Airborne Telescopes IX
EditorsHeather K. Marshall, Jason Spyromilio, Tomonori Usuda
ISBN (Electronic)9781510653450
StatePublished - 2022
EventGround-Based and Airborne Telescopes IX 2022 - Montreal, United States
Duration: Jul 17 2022Jul 22 2022

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceGround-Based and Airborne Telescopes IX 2022
Country/TerritoryUnited States


  • 3D metrology
  • absolute distance interferometry
  • active optics
  • differential distance measuring interferometry
  • edge sensing
  • laser trackers
  • laser truss
  • pointing models
  • telescope alignment

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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