High Angular Resolution Monolithic Optical and Near-infrared Integral field spectrograph

HARMONI, or the High Angular Resolution Monolithic Optical and Near-infrared Integral field spectrograph, is one of the first-light instruments installed on the Extremely Large Telescope (ELT) and will function as the telescope's workhorse instrument for spectroscopy in the wavelength range 0.47–2.45 µm. This versatile instrument will offer a set of spatial scales to optimise observations for a wide range of science programmes and observing conditions. In particular, HARMONI will be optimised to exploit the best image quality delivered from a post-focal laser tomographic adaptive optics module.

HARMONI is an integral field spectrograph, which can operate in a number of different ways. The design of the instrument is such that it will be easy to calibrate and operate, providing the ELT with a "point-and-shoot" spectroscopic instrument.

Thanks to the enormous 39-metre main mirror of the ELT, HARMONI will be used to explore galaxies in the early Universe, study the constituents of the local Universe and and characterise exoplanets in great detail. In many ways, it will be complementary to ALMA and the James Webb Space Telescope. HARMONI follows in the footsteps of the innovative second-generation VLT instruments like MUSE and SPHERE on the VLT.

The picture above shows a sectional view of HARMONI and its
size in comparison with a man. Credit: HARMONI Consortium


This table lists the global capabilities of the instrument. The authoritative technical specifications as offered for astronomical observations are available from the Science Operation page.

Site: Cerro Armazones
Telescope: Extremely Large Telescope
Focus: Nasmyth
Type: Spectrograph
Wavelength coverage: 0.47−2.45 µm
Spatial resolution: From seeing-limited to diffraction-limited
Spectral resolution: R~3000–20 000
First light date: 2024
Images taken with the instrument: Link
Images of the instrument: Link
Press Releases with the instrument: Link
Science goals: High-redshift galaxies, quasars, gamma-ray bursts, resolved stellar populations, exoplanets


United Kingdom:
The University of Oxford (UK)
UK Astronomy Technology Centre (UKATC)

Centre de Recherche Astrophysique de Lyon, France (CRAL)
Laboratoire d'Astrophysique de Marseille (LAM), France

Instituto de Astrofísica de Canarias, Spain (IAC)
Centro de Astrobiologia (CSIC - INTA)