A5011532052- Astro and Planetary Science
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Isotope Analysis in Ecology
- Astronomical Observations and Instrumentation
- Space Exploration and Technology
- Astronomy and Astrophysical Research
- Geophysics and Gravity Measurements
- Geological and Geochemical Analysis
- Geology and Paleoclimatology Research
- Space Satellite Systems and Control
- Satellite Image Processing and Photogrammetry
- Solar and Space Plasma Dynamics
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- History and Developments in Astronomy
- Advanced Photonic Communication Systems
- Atmospheric and Environmental Gas Dynamics
- High-pressure geophysics and materials
- Historical Geography and Cartography
- Spacecraft and Cryogenic Technologies
- Atmospheric Ozone and Climate
- Calibration and Measurement Techniques
- Spacecraft Design and Technology
- Astronomical and nuclear sciences
Observatoire de Paris
2013-2024
Roche (France)
2011-2024
Institut de Mécanique Céleste et de Calcul des Éphémérides
2015-2024
Romanian Academy
2011-2024
Université Paris Sciences et Lettres
2018-2024
Centre National de la Recherche Scientifique
2012-2024
University of Leicester
2024
Astronomical Institute of the Slovak Academy of Sciences
2003-2024
PTC (France)
2024
Sorbonne Université
2004-2023
Meteorites have long been considered as reflections of the compositional diversity main belt asteroids and consequently they used to decipher their origin, formation, evolution. However, while some meteorites are known sample surfaces metallic, rocky hydrated (about one-third mass belt), low-density icy (C-, P-, D-types), representing rest belt, appear be unsampled in our meteorite collections. Here we provide conclusive evidence that surface compositions these bodies compatible with those...
Context. Until recently, the 3D shape, and therefore density (when combining volume estimate with available mass estimates), surface topography of vast majority largest ( D ≥ 100 km) main-belt asteroids have remained poorly constrained. The improved capabilities SPHERE/ZIMPOL instrument opened new doors into ground-based asteroid exploration. Aims. To constrain formation evolution a representative sample large asteroids, we conducted high-angular-resolution imaging survey 42...
Context . The source regions of ordinary chondrites (~80% all falls) and large S-type near-Earth objects (NEOs; ~30%) have recently been identified with three young asteroid families (Karin, Koronis, Massalia) being at the origin most chondrite falls. Aims present work is a continuation our previous studies aims to determine remaining meteorite NEO classes, an emphasis on carbonaceous (CM, CI, CO, CV, CK, CR, CH, CB, or C-ungrouped). Methods We studied 38 individual families, including old...
Context. The interpretation of asteroid spectra provides the basis for determining chemical composition and physical process that modified surface asteroids. increasing number spectral measurements has lead to well-developed methods analyzing spectra. There is however no centralized database all published data a set standard routines also required.
Although petrologic, chemical and isotopic studies of ordinary chondrites meteorites in general have largely helped establish a chronology the earliest events planetesimal formation their evolution, there are several questions that cannot be resolved via laboratory measurements and/or experiments only. Here we propose rationale for new constraints on evolution chondrite parent bodies (and by extension most planetesimals) from newly available spectral mineralogical analysis main belt S-type...
We obtained high signal to noise spectra of the two targets Dawn mission, 4 Vesta and 1 Ceres from observations carried out in remote control between Observatoire de Paris-Meudon NASA Infrared Telescope Facility on Mauna Kea. was observed 0.7–2.5 spectral region at three different rotational phases order i) determine mineral composition; ii) understand variations across surface. also 2.0–3.8 range. The 3 μm absorption feature not detected, implying absence OH and/or H2O-bearing minerals...
Trans-Neptunian objects (TNOs) and Centaurs display the widest color diversity in comparison to other small solar system bodies. The investigation of their properties can help understanding evolution these objects. In this paper we propose a classification scheme based on multivariate statistical analysis homogeneous, high-quality set B - V, V R, I, J indices. Analyzing sample 51 using high confidence level, four groups have been identified named: BB, BR, IR, RR. group BB contains with...
ABSTRACT CM chondrites are the most common type of hydrated meteorites, making up ∼1.5% all falls. Whereas experienced only low-temperature (∼0°C–120°C) aqueous alteration, existence a small fraction that suffered both hydration and heating complicates our understanding early thermal evolution parent body(ies). Here, we provide new constraints on collisional history CM-like bodies from comparison between newly acquired spectral measurements main-belt Ch/Cgh-type asteroids (70 objects)...
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 We present the results of a fourth planetary defense exercise, focused this time on small near-Earth asteroid (NEA) 2023 DZ2 and conducted during its close approach to Earth in March. The International Asteroid Warning Network (IAWN), with support from NASA's Planetary Defense Coordination Office (PDCO), has been coordinating observational campaigns since 2017 test operational readiness global capabilities. last campaign NEA Apophis, an outcome that exercise was need for short burst...
The new Rosetta mission baseline to the comet 67P/Churyumov-Gerasimenko includes two asteroid fly-bys. To help in target selection we studied all candidates of possible scenarios. Observations have been carried out at ESO-NTT (La Silla, Chile), TNG (Canaries), and NASA-IRTF (Hawaii) telescopes, order determine taxonomy candidates. targets were chosen after spacecraft interplanetary orbit insertion manoeuvre, when available total amount was known. On basis our analysis , recommended ESA...
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. It has recently been proposed that the surface composition of icy main-belt asteroids (B-, C-, Cb-, Cg-, P-, and D-types) may be consistent with chondritic porous interplanetary dust particles (CP IDPs).