Patrick Michel
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View article: The Radio Science Experiment on Hera, Juventas and Milani
The Radio Science Experiment on Hera, Juventas and Milani Open
Hera, the European Space Agency’s first planetary defence mission, complements NASA’s DART mission as part of the Asteroid Impact and Deflection Assessment collaboration. Its primary objective is to conduct a detailed post-impact analysis …
View article: Direct In Situ Measurement of Alkalinity Export for Real-Time Enhanced Weathering MRV
Direct In Situ Measurement of Alkalinity Export for Real-Time Enhanced Weathering MRV Open
View article: Correction to: HyperScout-H: The Hyperspectral Imager for the ESA Hera Mission
Correction to: HyperScout-H: The Hyperspectral Imager for the ESA Hera Mission Open
View article: HyperScout-H: The Hyperspectral Imager for the ESA Hera Mission
HyperScout-H: The Hyperspectral Imager for the ESA Hera Mission Open
View article: The Influence of Central Body Tides on Catastrophic Disruptions of Close-in Planetary Satellites
The Influence of Central Body Tides on Catastrophic Disruptions of Close-in Planetary Satellites Open
We model the outcomes of catastrophic disruptions on small, gravity-dominated natural satellites, accounting for the tidal potential of the central body, which is neglected in classical disruption scaling laws. We introduce the concept of …
View article: Correction: The WheelCams on the IDEFIX rover
Correction: The WheelCams on the IDEFIX rover Open
View article: Effects of ethylenediamine on the intrinsic photoresponse of PbS quantum dots
Effects of ethylenediamine on the intrinsic photoresponse of PbS quantum dots Open
We examine the intrinsic recombination dynamics of PbS quantum dots (QDs) functionalized with ethylenediamine (EDA) and compare it to the same QDs functionalized with ethane-1,2-dithiol (EDT). The recombination dynamics were studied as a f…
View article: Time‐Resolved Intrinsic and Extrinsic Photoresponse of Colloidal Short‐Wavelength Infrared‐Active Indium Antimonide Quantum Dot Photodetectors
Time‐Resolved Intrinsic and Extrinsic Photoresponse of Colloidal Short‐Wavelength Infrared‐Active Indium Antimonide Quantum Dot Photodetectors Open
Colloidal indium antimonide (InSb) quantum dots (QDs) are highly promising nanomaterials for short‐wavelength infrared (SWIR) photodetectors due to their optical properties, solution processability, and low toxicity. Here, surface engineer…
View article: The WheelCams on the IDEFIX rover
The WheelCams on the IDEFIX rover Open
View article: Understanding the Long-term Rotational Evolution of Asteroids with Gaia
Understanding the Long-term Rotational Evolution of Asteroids with Gaia Open
The rotational dynamics of asteroids are primarily governed by two mechanisms: collisions and the Yarkovsky–O'Keefe–Radzievskii–Paddack (YORP) effect. The YORP effect is a radiative torque resulting from the anisotropic emission of thermal…
View article: Seismic Instrument for Asteroids (SIA): the RAMSES seismometer
Seismic Instrument for Asteroids (SIA): the RAMSES seismometer Open
The close encounter between asteroid Apophis and Earth in 2029 presents an unparalleled opportunity for the first in-situ seismic study of an asteroid. The Seismic Instrument for Asteroids (SIA) will be deployed to the surface of (99942) A…
View article: Refining the Deimos Shape Model with Hera Asteroid Framing Cameras Observations
Refining the Deimos Shape Model with Hera Asteroid Framing Cameras Observations Open
While there has never been a dedicated spacecraft mission to Deimos, several Mars-focused spacecraft have imaged the small moon. The spacecraft orbits, number of imaging opportunities, and tidally locked state of Deimos have limited the sp…
View article: Spectral Characterization of the Far Side of Deimos Using the HyperScout-H Instrument Aboard the ESA Hera Spacecraft
Spectral Characterization of the Far Side of Deimos Using the HyperScout-H Instrument Aboard the ESA Hera Spacecraft Open
On March 12, 2025, the ESA Hera mission performed a flyby of Mars on the way to its target, the binary asteroid system Didymos–Dimorphos. This event provided a unique opportunity to acquire spectral data (within the 0.65–0.96 micron wavele…
View article: The ESA Hera mission on its way to the binary asteroid Didymos: characterization of the asteroid and full documentation of the NASA DART impact
The ESA Hera mission on its way to the binary asteroid Didymos: characterization of the asteroid and full documentation of the NASA DART impact Open
The Hera mission was launched on October 7, 2024 and performed succefully a flyby of Mars on March 12, 2025, which placed the spacecraft on its trajectory to the binary asteroid Didymos. Hera will approach Didymos in October 2026 and start…
View article: Radar tomography of asteroid deep interior. JuRa / HERA to Didymos and the Radars to Apophis: status of the instruments
Radar tomography of asteroid deep interior. JuRa / HERA to Didymos and the Radars to Apophis: status of the instruments Open
Our knowledge of the internal structure of asteroids relies entirely on inferences from remote sensing observations of the surface and theoretical modeling. Many fundamental questions are still unresolved. Is the body a monolithic piece of…
View article: Findings and Recommendations of the Apophis T-4 Years Workshop "Knowledge Opportunity for the Science of Planetary Defense"
Findings and Recommendations of the Apophis T-4 Years Workshop "Knowledge Opportunity for the Science of Planetary Defense" Open
The solar system small bodies community, having a dedicated interest in the planetary defense science opportunity presented by the exceedingly rare natural event of the large (340-meter) asteroid Apophis safely passing within 32,000 km of …
View article: ALE'S Mass Driver Experiment: Investigating Apophis Surface Dynamics for Planetary Defense and Resource Utilization
ALE'S Mass Driver Experiment: Investigating Apophis Surface Dynamics for Planetary Defense and Resource Utilization Open
Introduction: Asteroid (99942) Apophis’ Earth flyby in 2029 presents a unique opportunity to investigate how its surface material behaves under gravitational and external force influences. The ExLabs-led ApophisExL mission integrates multi…
View article: RAMSES: A European rendezvous mission to study tidal effects on the Near-Earth Asteroid Apophis during its 2029 close encounter with the Earth
RAMSES: A European rendezvous mission to study tidal effects on the Near-Earth Asteroid Apophis during its 2029 close encounter with the Earth Open
IntroductionThe ESA RAMSES (Rapid Apophis Mission for SpacE Safety) mission is designed to rendezvous with the Potentially Hazardous Asteroid (99942) Apophis prior to its extremely close approach to Earth on April 13, 2029, at a distance o…
View article: Geomorphology and Albedo distribution on the Anti-Mars hemisphere of Deimos observed with Asteroid Framing Cameras (AFC) on the Hera Spacecraft
Geomorphology and Albedo distribution on the Anti-Mars hemisphere of Deimos observed with Asteroid Framing Cameras (AFC) on the Hera Spacecraft Open
ESA’s Hera mission performed a Mars flyby on March 12, 2025, en route to the binary asteroid system Didymos–Dimorphos, which has been greatly influenced by NASA’s DART spacecraft impact (Michel et al. 2022). This flyby event presented a un…
View article: Satellite formation around the largest asteroids
Satellite formation around the largest asteroids Open
A subset of large asteroids (Diameter larger than 100km) are found to be in multi-asteroid systems: asteroids with one or more satellites. The formation of these large multi-asteroid systems is generally thought to occur through impacts in…
View article: IDEFIX - The MMX Phobos Rover: One year before launch
IDEFIX - The MMX Phobos Rover: One year before launch Open
IntroductionThe Martian Moon eXploration (MMX) mission by the Japan Aerospace Exploration Agency, JAXA,is going to explore the martian moons Phobos and Deimos. Both moons will be investigated remotely from the mother spacecraft, that will …
View article: Orbital Capture of Ejecta into Periodic Orbits around Binary Asteroid (65803) Didymos
Orbital Capture of Ejecta into Periodic Orbits around Binary Asteroid (65803) Didymos Open
The successful impact of the Double Asteroid Redirection Test (DART) spacecraft on Dimorphos enabled the first-ever extensive observation of a postimpact ejecta tail from a binary asteroid system. Studying the ejecta can provide insights i…
View article: Satellite Formation around the Largest Asteroids
Satellite Formation around the Largest Asteroids Open
Satellites around large asteroids are preferentially found among those with the most rapid rotation and elongated shape. The taxonomic statistics are similarly skewed; in total, 13 asteroids larger than 100 km are known to have satellites,…
View article: Satellite formation around the largest asteroids
Satellite formation around the largest asteroids Open
Satellites around large asteroids are preferentially found among those with the most rapid rotation and elongated shape. The taxonomic statistics are similarly skewed; in total, 13 asteroids larger than 100 km are known to have satellites,…
View article: Time-Resolved Intrinsic and Extrinsic Photoresponse of Colloidal SWIR-Active Indium Antimonide Quantum Dot Photodetectors
Time-Resolved Intrinsic and Extrinsic Photoresponse of Colloidal SWIR-Active Indium Antimonide Quantum Dot Photodetectors Open
Colloidal indium antimonide (InSb) quantum dots (QDs) are highly promising nanomaterials for SWIR photodetectors due to their optical properties, solution processability, and low toxicity. Here, we present surface engineering of colloidal …
View article: Diverse evolutionary pathways of spheroidal asteroids driven by rotation rate
Diverse evolutionary pathways of spheroidal asteroids driven by rotation rate Open
Asteroids preserve a continuous record of evolutionary processes since the early solar system. They can take various shapes that represent the cumulative results of their evolution. However, for those showing common characteristics, this d…
View article: The Religious Factor in the Global World: Indicator and Modality of Management
The Religious Factor in the Global World: Indicator and Modality of Management Open
Our point of departure is Michel de Certeau's statement that when the politics weakens, the religious returns. However, when it returns, it is not the same. The first function of its re-appearance is to emphasise such a severe deficit of p…
View article: Confined tumbling state as the origin of the excess of slowly rotating asteroids
Confined tumbling state as the origin of the excess of slowly rotating asteroids Open
View article: Ultrafast Hot Carrier Cooling Enabled van der Waals Photodetectors at Telecom Wavelengths
Ultrafast Hot Carrier Cooling Enabled van der Waals Photodetectors at Telecom Wavelengths Open
Two-dimensional (2D) materials with high carrier mobility and picosecond intrinsic response times exhibit large potential for fast optoelectronics operating at telecom wavelengths. However, due to the inefficient utilization of hot carrier…
View article: Elliptical ejecta of asteroid Dimorphos is due to its surface curvature
Elliptical ejecta of asteroid Dimorphos is due to its surface curvature Open