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| ELT HARMONI | |
|---|---|
| Name | HARMONI |
| Telescope | Extremely Large Telescope |
| Type | Integral Field Spectrograph |
| Wavelength | Visible to near-infrared (0.47–2.45 μm) |
| Institution | European Southern Observatory |
| Status | Commissioned |
| First light | 2027 |
| Authors | consortium including UK Astronomy Technology Centre, Durham University, Oxford University |
ELT HARMONI
HARMONI is an integral field spectrograph built for the Extremely Large Telescope to deliver spatially resolved spectroscopy across visible and near-infrared bands. Conceived and developed by a European consortium led by the European Southern Observatory and UK institutions, HARMONI is designed to exploit the aperture of the ELT for studies ranging from exoplanet atmospheres to galaxy evolution. Its role complements instruments such as METIS, MICADO, and MOSAIC within the ELT instrument suite and builds on heritage from instruments like SINFONI, KMOS, and MUSE.
HARMONI provides optical design modes enabling diffraction-limited performance with the Adaptive Optics Facility and laser guide star systems developed for the European Southern Observatory instrumentation program. It supports multiple spatial scales and spectral resolutions to observe targets studied by observatories such as Hubble Space Telescope, James Webb Space Telescope, Atacama Large Millimeter/submillimeter Array, Very Large Telescope, and Subaru Telescope. Scientific drivers link to campaigns by teams at Max Planck Institute for Astronomy, Harvard-Smithsonian Center for Astrophysics, Institute of Astronomy, Cambridge, Leiden Observatory, and University of California, Berkeley.
The optical layout employs an integral field unit feeding spectrographs that cover 0.47–2.45 μm with selectable resolving powers up to R~20000, matching science cases proposed by consortia including STFC, CNRS, INAF, FCT, and NSF. HARMONI's field of view and spaxel scales are optimized for synergy with adaptive optics modules from UK Astronomy Technology Centre, ONERA, and European Southern Observatory partners. Mechanical and cryogenic systems reflect engineering practices from projects such as JWST NIRSpec, VLT SINFONI, and Keck OSIRIS, while detector choices reference devices used on Hubble Space Telescope Wide Field Camera 3 and NIRCam teams.
HARMONI targets a range of astrophysical problems championed by researchers at University of Cambridge, University of Oxford, University of Tokyo, Caltech, Oxford Astrophysics, and Imperial College London. Key objectives include characterizing exoplanet atmospheres discovered by Kepler, TESS, and PLATO; measuring stellar populations in galaxies observed by Sloan Digital Sky Survey and Euclid; and probing high-redshift galaxies at epochs studied by ALMA and JWST. The instrument enables kinematic mapping central to programs by European Research Council grantees, long-baseline studies by Max Planck Society groups, and chemical abundance work from teams at Carnegie Institution for Science and Leiden University.
HARMONI comprises an integral field unit, selectable gratings, cryogenic spectrograph assemblies, and detector arrays derived from collaborations with Teledyne Imaging Sensors teams and laboratories at RAL Space and CEA. Adaptive optics integration uses real-time controllers and wavefront sensors informed by developments at ESO Optics Laboratory, Durham University, and Oxford Instrumentation. Calibration subsystems draw on methods tested with VLT X-shooter and Keck DEIMOS, while software and data reduction pipelines were coordinated with science centers such as Centre de Recherche Astrophysique de Lyon, Instituto de Astrofísica de Canarias, and Space Telescope Science Institute.
HARMONI is mounted on the ELT Nasmyth platforms and interfaces with the ELT adaptive optics modules and ELT M4 adaptive mirror control systems. Its operation is planned within ELT observing modes established by the European Southern Observatory governance framework and scheduling tools used by facilities like Gemini Observatory and Keck Observatory. The instrument's cryogenic and thermal design aligns with site conditions at Paranal Observatory and complements nearby facilities including ALMA and VISTA for multiwavelength campaigns.
Commissioning followed phases coordinated with the ELT project office, involving teams from STFC Rutherford Appleton Laboratory, INAF Arcetri Astrophysical Observatory, Observatoire de Paris, and Max Planck Institute for Extraterrestrial Physics. Performance verification benchmarks compared HARMONI results against expectations from lab testbeds and simulations developed in collaboration with ESO Science Operations and academic software groups at University of Durham and Leiden Observatory. On-sky demonstrations targeted calibration stars cataloged by Gaia and science verification observations tied to programs led by researchers at University of California, Santa Cruz and University of Toronto.
The HARMONI consortium assembled partners across Europe and international collaborators including institutions like UK Astronomy Technology Centre, Durham University, Leiden Observatory, INAF, TU Delft, ETH Zurich, and industrial partners such as Thales Alenia Space and E2V. Funding and governance involved agencies including European Southern Observatory, STFC, CNRS, INFN, and national ministries. Technology transfer and legacy draw on prior collaborations exemplified by MUSE consortium, SINFONI team, and instrument projects at European Southern Observatory. The instrument’s development history reflects coordinated milestones with the ELT program, major reviews by panels from European Commission research frameworks, and community-driven science prioritization via reports from ESO Science Committee and the A&A journal community.
Category:Instruments of the Extremely Large Telescope