A5101513154- Astro and Planetary Science
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Solar and Space Plasma Dynamics
- Astronomical Observations and Instrumentation
- Isotope Analysis in Ecology
- Astronomy and Astrophysical Research
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Space Exploration and Technology
- Space Satellite Systems and Control
- Geophysics and Gravity Measurements
- Astronomical and nuclear sciences
- High-pressure geophysics and materials
- History and Developments in Astronomy
- Gamma-ray bursts and supernovae
- Geology and Paleoclimatology Research
- Scientific Research and Discoveries
- Space Science and Extraterrestrial Life
- Geological and Geochemical Analysis
- Spaceflight effects on biology
- Distributed and Parallel Computing Systems
- Advanced Frequency and Time Standards
- Advanced optical system design
Institut de Mécanique Céleste et de Calcul des Éphémérides
2012-2024
Sorbonne Université
2011-2023
Centre National de la Recherche Scientifique
2011-2023
Université Paris Sciences et Lettres
2015-2023
Université de Lille
2012-2023
Observatoire de Paris
2008-2017
Roche (France)
1989-2017
ADIR Association
2015
Observatoire Midi-Pyrénées
2015
Physiologie Environnement et Génétique pour l'Animal et les Systèmes d'Elevage
2015
Context. Asteroid modeling efforts in the last decade resulted a comprehensive dataset of almost 400 convex shape models and their rotation states. These already provided deep insight into physical properties main-belt asteroids or large collisional families. Going finer detail (e.g., smaller families, with sizes ≲20 km) requires knowledge parameters more objects.
The larger number of models asteroid shapes and their rotational states derived by the lightcurve inversion give us better insight into both nature individual objects whole population. With a statistical sample we can study physical properties populations, such as main-belt asteroids or families, in more detail. Shape also be used combination with other types observational data (IR, adaptive optics images, stellar occultations), e.g., to determine sizes thermal properties. We use all...
Two narrow and dense rings (called C1R C2R) were discovered around the Centaur object (10199) Chariklo during a stellar occultation observed on 2013 June 3. Following this discovery, we planned observations of several occultations by Chariklo's system in order to better characterize physical properties ring main body. Here, use 12 successful occulations between 2014 2016. They provide profiles (physical width, opacity, edge structure) constraints radii pole position. Our new are currently...
Asteroid (16) Psyche is the target of NASA mission. It considered one few main-belt bodies that could be an exposed proto-planetary metallic core and would thus related to iron meteorites. Such association however challenged by both its near- mid-infrared spectral properties reported estimates density. Here, we aim refine density set further constraints on bulk composition determine potential meteoritic analog. We observed with ESO VLT/SPHERE/ZIMPOL as part our large program (ID 199.C-0074)....
Abstract On February 28, 2021, a fireball dropped ∼0.6 kg of recovered CM2 carbonaceous chondrite meteorites in South‐West England near the town Winchcombe. We reconstruct fireball's atmospheric trajectory, light curve, fragmentation behavior, and pre‐atmospheric orbit from optical records contributed by five networks. The progenitor meteoroid was three orders magnitude less massive (∼13 kg) than any previously observed fall. Winchcombe meteorite survived entry because it exposed to very low...
Aims. We determine the physical properties (spin state and shape) of asteroid (21) Lutetia, target ESA Rosetta mission, to help in preparing for observations during flyby on 2010 July 10 by predicting orientation Lutetia as seen from Rosetta. Methods. use our novel KOALA inversion algorithm asteroids a combination optical lightcurves, disk-resolved images, stellar occultations, although latter are not available Lutetia. Results. find spin axis lie within 5 degrees ({\lambda} = 52 deg.,...
Context. The vast majority of the geophysical and geological constraints (e.g., internal structure, cratering history) for main-belt asteroids have so far been obtained via dedicated interplanetary missions ESA Rosetta, NASA Dawn). high angular resolution SPHERE/ZIMPOL, new-generation visible adaptive-optics camera at ESO VLT, implies that these science objectives can now be investigated from ground a large fraction D ≥ 100 km asteroids. sharp images acquired by this instrument used to...
Context. Over the past decades, several interplanetary missions have studied small bodies in situ, leading to major advances our understanding of their geological and geophysical properties. These missions, however, had a limited number targets. Among them, NASA Dawn mission has characterised detail topography albedo variegation across surface asteroid (4) Vesta down spatial resolution ~20 m pixel −1 scale. Aims. Here aim was determine how much topographic information can be retrieved from...
Dynamical models of Solar System evolution have suggested that P-/D-type volatile-rich asteroids formed in the outer and may be genetically related to Jupiter Trojans, comets small KBOs. Indeed, their spectral properties resemble anhydrous cometary dust. High-angular-resolution images P-type asteroid (87) Sylvia with VLT/SPHERE were used reconstruct its 3D shape, study dynamics two satellites. We also model Sylvia's thermal evolution. The shape appears flattened elongated. derive a...
Aims.In the framework of ground-based science campaign dedicated to encounter with Rosetta spacecraft, mineralogy asteroid (21) Lutetia was investigated.
Context.
Context. The shapes and spin states of asteroids observed with photometric techniques can be reconstructed using the lightcurve inversion method. resultant models then confirmed or exploited further by other techniques, such as adaptive optics, radar, thermal infrared, stellar occultations, space probe imaging.
Context. Asteroid 2867 Steins is the first target of Rosetta space mission with a flyby scheduled in September 2008.
Context.The potentially hazardous asteroid (99942) Apophis, previously designated 2004 MN 4 , is emblematic of the study asteroids that could impact Earth in near future.Orbit monitoring and error propagation analysis are mandatory to predict probability an and, furthermore, its possible mitigation.Several aspects for this prediction have be investigated, particular orbit adjustment updates when new astrometric data available.Aims.We analyze Apophis provide predictions based on observational...
During the 2014–2015 mutual events season, Institut de Mécanique Céleste et Calcul des Éphémérides (IMCCE), Paris, France, and Sternberg Astronomical Institute (SAI), Moscow, Russia, led an international observation campaign to record ground-based photometric observations of Galilean moon occultations eclipses. We focused on processing complete data base compute new accurate astrometric positions. used our method derive positions from light curves events. developed model eclipses, while...