LIRA, a pioneer in astrophysics and instrumentation, pushes back the frontiers of knowledge
LIRA
Laboratory for Instrumentation and Research in Astrophysics
BepiColombo begins its approach to Mercury!
7 September 2026After nearly eight years of travel, 10.2 billion km and nine planetary flybys – including six of Mercury – the BepiColombo mission has just reached a major milestone: on 3 September 2026, the Mercury Transfer Module (MTM) successfully separated from the two scientific orbiters, ESA’s Mercury Planetary Orbiter (MPO) and the Mercury Magnetospheric Orbiter (Mio). Equipped with solar-powered electric motors, the MTM’s mission ends here, but this separation does not mark BepiColombo’s arrival at the planet: it marks the beginning of its mission.
The two orbiters are now continuing their journey together towards Mercury before separating in turn and each entering their dedicated scientific orbit to study the planet from complementary perspectives.
LIRA plays a central role in this mission with two instruments: VIHI, a spectro-imager on board the MPO, which will produce a comprehensive mineralogical map of the planet’s surface to shed light on its geological history; and SORBET, a high-frequency radio receiver on board the Mio, which will study Mercury’s magnetosphere and its interaction with the solar wind using radio frequencies for the first time.
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News
Successful separation of the transfer module from the BepiColombo mission
The fastest star in the Milky Way orbits so close to our supermassive black hole that it is affected by its rotation
Mathias Nowak has been awarded a ‘PSL Young Researcher Starting Grant’ for 2026
Presentation
LIRA, a CNRS joint research unit at Paris Observatory, is a laboratory of excellence in astrophysics and instrumentation. It studies astrophysical objects, from the Solar System to our Galaxy and beyond, through five thematic areas. Through international collaboration and instrumental innovation, it pushes back the frontiers of science and contributes to the training and dissemination of knowledge.
Our projects
MIRS on the JAXA MMX mission
The Martian Moons eXploration (MMX) mission of JAXA (Japan Aerospace Exploration Agency) is the first sample-return mission from the Phobos satellite. It also includes an exploration of the Martian system. The mission’s primary objective is to decipher the origin of Martian moons, which will provide important information on planet formation and the conditions for the emergence of water on Earth-like planets.
The MIRS (MMX InfraRed Spectrometer) instrument, developed under the leadership of LESIA (now LIRA), is an imaging spectrometer that will characterize the composition of the Martian system and help select candidate sites for sample collection.
GRAVITY+
The GRAVITY instrument, installed on the European Southern Observatory’s Very Large Telescope Interferometer (VLTI/ESO), has produced spectacular and transformative results on the supermassive black hole at the centre of the Milky Way, the active nuclei of other galaxies, proto-planetary disks around young stars and exoplanets. GRAVITY+ aims to modernise both VLTI and GRAVITY to make them ≈ 100 times more sensitive, while increasing sky coverage by a factor of ≈ 100, and contrast in the vicinity of bright objects by a factor of ≈ 10. These gains will benefit all the VLTI’s current and future instruments for the next 20 years, and will perpetuate it as a unique infrastructure in the world.
All projects
Projets en développement
Projets en exploitation
Projets passés
Contacts
Contacts
Postal address
Observatoire de Paris
5, place Jules Janssen
92195 Meudon
Phone
01 45 07 77 01
Meudon site
LIRA
Observatoire de Paris
5, place Jules Janssen
92195 MEUDON Cedex
Paris site
LIRA
Observatoire de Paris
77, Avenue Denfert-Rochereau
75014 Paris
Cergy site
LIRA - Site de Neuville II
UFR Sciences et Techniques - Département de physique
5, mail Gay Lussac
95000 Neuville-sur-Oise