MICADO

MICADO. The Multi-Adaptive Optics Imaging Camera for Deep Observations is a first-light instrument for the Extremely Large Telescope under construction in Chile. It is designed to deliver extremely sharp, high-resolution images in the near-infrared, leveraging the telescope's unprecedented light-collecting power. This instrument will enable transformative studies of exoplanets, distant galaxies, and the dynamics of stars near the supermassive black hole at the center of the Milky Way.

Overview

MICADO is a cornerstone first-generation instrument for the European Southern Observatory's flagship ground-based observatory. Its primary capability is diffraction-limited imaging, which will be achieved through a sophisticated combination of the ELT's adaptive optics systems. The instrument consortium is spearheaded by the Max Planck Institute for Extraterrestrial Physics in Garching, with major contributions from institutes across Europe, including the Netherlands Research School for Astronomy and the Institut de Planétologie et d'Astrophysique de Grenoble. Upon commissioning, it will provide astronomers with an unparalleled view of the universe in the J, H, and K band atmospheric windows.

Instrument design

The core of the instrument is a high-resolution imaging camera equipped with a large-format detector array sensitive to near-infrared light. It incorporates several key observational modes, including wide-field imaging, high-contrast imaging for exoplanet detection, and long-slit spectroscopy. A critical design feature is its tight integration with the ELT's adaptive optics suite, particularly the MAORY multi-conjugate adaptive optics module, which will correct for atmospheric turbulence across a wide field of view. The cryogenic opto-mechanical design ensures stability and minimal thermal noise for detecting faint astronomical sources, from brown dwarfs to the most distant quasars.

Scientific objectives

The science cases driving the instrument's design are exceptionally broad. A flagship goal is to precisely measure the motions of stars orbiting Sagittarius A*, the supermassive black hole in the Galactic Center, to test predictions of general relativity in an extreme gravitational field. In the field of exoplanetary science, it will directly image and characterize gas giant planets around nearby stars, complementing missions like the James Webb Space Telescope. Cosmological studies will target the assembly of the first galaxies and the evolution of their structures, probing the early universe with a clarity rivaling space-based observatories. Additional programs will study stellar populations in Local Group galaxies like the Andromeda Galaxy and resolve details in protoplanetary disks.

Development and timeline

The project was formally initiated following a successful Phase A study and the signing of a construction agreement between ESO and the instrument consortium. The design and fabrication phase involves a distributed network of partner institutes across several countries, including France, Germany, Italy, Austria, and the Netherlands. Major milestones have included the preliminary design review and the ongoing manufacturing of key subsystems like the cryostat and detector electronics. The project schedule is tightly coordinated with the progress of the ELT itself and the development of the MAORY adaptive optics module to ensure seamless integration.

Integration with the ELT

The instrument will be installed at the Nasmyth platform of the ELT, a stationary focal station where large, heavy instruments can be mounted. Its operation is fundamentally dependent on the telescope's adaptive optics systems, which use laser guide stars and natural guide stars to measure and correct atmospheric distortion in real time. Data from the camera will flow into the ESO data processing pipeline, ultimately being archived at the ESO Science Archive Facility in Garching for use by the global astronomical community. This integration represents a major step in the observatory's plan to revolutionize ground-based astronomy.

Category:Astronomical instruments Category:Extremely Large Telescope