U. Carsenty
A5090596743- 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
- Solar and Space Plasma Dynamics
- Gamma-ray bursts and supernovae
- Spacecraft Design and Technology
- Space Science and Extraterrestrial Life
- Nuclear Physics and Applications
- Geological and Geochemical Analysis
- Infrared Target Detection Methodologies
- Satellite Image Processing and Photogrammetry
- Geology and Paleoclimatology Research
- Calibration and Measurement Techniques
- Space exploration and regulation
- Spacecraft and Cryogenic Technologies
- Astrophysics and Star Formation Studies
- History and Developments in Astronomy
- High-pressure geophysics and materials
- Advanced Semiconductor Detectors and Materials
- Astrophysical Phenomena and Observations
- Geological Formations and Processes Exploration
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2011-2024
Institut de Planétologie et d'Astrophysique de Grenoble
2016
Centre National de la Recherche Scientifique
2016
Université Grenoble Alpes
2016
Planet
1995-2016
Planetary Science Institute
2010-2011
Polish Academy of Sciences
1998
University of Maryland, College Park
1990
Arizona State University
1986
Max Planck Institute for Astronomy
1983
The VIRTIS (Visible, Infrared and Thermal Imaging Spectrometer) instrument on board the Rosetta spacecraft has provided evidence of carbon-bearing compounds nucleus comet 67P/Churyumov-Gerasimenko. very low reflectance (normal albedo 0.060 ± 0.003 at 0.55 micrometers), spectral slopes in visible infrared ranges (5 to 25 1.5 5% kÅ(-1)), broad absorption feature 2.9-to-3.6-micrometer range present across entire illuminated surface are compatible with opaque minerals associated nonvolatile...
A New Dawn Since 17 July 2011, NASA's spacecraft has been orbiting the asteroid Vesta—the second most massive and third largest in solar system (see cover). Russell et al. (p. 684 ) use Dawn's observations to confirm that Vesta is a small differentiated planetary body with an inner core, represents surviving proto-planet from earliest epoch of formation; also confirmed as source howardite-eucrite-diogenite (HED) meteorites. Jaumann 687 report on asteroid's overall geometry topography, based...
The Visible, InfraRed, and Thermal Imaging Spectrometer (VIRTIS) on Rosetta obtained hyperspectral images, spectral reflectance maps, temperature maps of the asteroid 21 Lutetia. No absorption features, either silicates or hydrated minerals, have been detected across observed area in range from 0.4 to 3.5 micrometers. surface reaches a maximum value 245 kelvin correlates well with topographic features. thermal inertia is 20 30 joules meter(-2) kelvin(-1) second(-0.5), comparable lunarlike...
Rosetta observes sublimating surface ices Comets are “dirty snowballs” made of ice and dust, but they dark because the sublimates away, leaving some dust behind on surface. The spacecraft has provided a close-up view comet 67P/Churyumov-Gerasimenko as it passes through its closest point to Sun (see Perspective by Dello Russo). Filacchione et al. detected spectral signature solid CO 2 (dry ice) in small patches nucleus emerged from local winter. By modeling how sublimates, constrain...
ABSTRACT Previous observations suggested that Ceres has active, but possibly sporadic, water outgassing as well varying spectral characteristics over a timescale of months. We used all available data collected in the past three decades from ground and Hubble Space Telescope , newly acquired images by Dawn Framing Camera, to search for albedo variability on Ceres, both global scale local regions, particularly bright spots inside Occator crater, timescales few months decades. Our analysis...
We present the results of a Jupiter Trojans' light curve survey aimed at characterizing rotational properties Trojans in approximate size range 60–150 km. The survey, which was designed to provide reliable and unbiased estimates rotation periods amplitudes, resulted curves for total 80 objects, 56 represent first determinations published date nine supersede previously erroneous values. Our more than double existing database Jovian selected range. analysis distributions amplitudes is subject...
Abstract Due to the small current obliquity of Ceres ( ε ≈4°), permanently shadowed regions (PSRs) exist on dwarf planet's surface. Since existence and persistence PSRs depend obliquity, we compute history over last 3 Myr find that it undergoes large oscillations with a period 24.5 kyr maximum m x ≈19.6°. During periods most present‐day receive direct sunlight. Some craters in Ceres's polar possess bright crater floor deposits (BCFDs). We an apparent correlation between BCFDs persistent...
Earth-based observations of Jupiter indicate that the Galileo probe probably entered Jupiter's atmosphere just inside a region has less cloud cover and drier conditions than more 99 percent rest planet. The visual appearance clouds at site was generally dark longer wavelengths. tropospheric stratospheric temperature fields have strong longitudinal wave structure is expected to manifest itself in vertical profile.
We present a comprehensive analysis of bright, long duration (T90 ~ 257 s) GRB 110205A at redshift z= 2.22. The optical prompt emission was detected by Swift/UVOT, ROTSE-IIIb and BOOTES telescopes when the still radiating in gamma-ray band. Nearly 200 s observations were obtained simultaneously from optical, X-ray to gamma-ray, which makes it one exceptional cases study broadband spectral energy distribution across 6 orders magnitude during phase. By fitting time resolved spectra, we clearly...
Abstract We mapped all boulders larger than 105 m on the surface of dwarf planet Ceres using images Dawn framing camera acquired in Low Altitude Mapping Orbit. find that are more numerous toward high latitudes and have a maximum lifetime 150 ± 50 Ma, based crater counts. These characteristics distinctly different from those asteroid (4) Vesta, an earlier target Dawn, which implies Ceres’ mechanically weaker. Clues to their properties can be found composition complex crust, is rich...
The visible infrared thermal imaging spectrometer (VIRTIS) is one of the principal payloads to be launched in 2003 on ESA's Rosetta spacecraft. Its primary scientific objective s are map surface comet Wirtanen, monitor its temperature, and identify solids gaseous species nucleus coma. VIRTIS will also collet data two asteroids, which has been identified as Mimistrobell. collected remotely using a mapping co-boresighted with high spectral resolution spectrometer. mapper consists Shafer...
Dawn's framing camera observed boulders on the surface of Vesta when spacecraft was in its lowest orbit (LAMO). We identified, measured, and mapped LAMO images, which have a scale 20 m per pixel. estimate that our sample is virtually complete down to boulder size 4 pixels (80 m). The largest 400 m-sized block Marcia crater floor. Relatively few reside large area relatively low albedo, surmised be carbon-rich ejecta Veneneia basin, either because form less easily here or live shorter. By...
The Rosetta spacecraft accomplished a flyby of Mars on its way to 67P/Churyumov‐Gerasimenko 25 February 2007. In this paper we describe the measurements obtained by M channel Visual and Infrared Thermal Imaging Spectrometer (VIRTIS‐M) first scientific results derived from their analysis. broad spectral coverage VIRTIS‐M in IR permitted study various phenomena occurring Martian atmosphere; observations were further exploited achieve accurate absolute radiometric calibration. Nighttime data...