C. Tubiana
A5008368651- Astro and Planetary Science
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Stellar, planetary, and galactic studies
- Astronomical and nuclear sciences
- Geology and Paleoclimatology Research
- Atmospheric Ozone and Climate
- Spacecraft and Cryogenic Technologies
- Astrophysics and Star Formation Studies
- Nuclear Physics and Applications
- Nuclear physics research studies
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Radioactive Decay and Measurement Techniques
- Medical Imaging Techniques and Applications
- Space Satellite Systems and Control
- Solar and Space Plasma Dynamics
- Space Exploration and Technology
- Radioactivity and Radon Measurements
- Radioactive contamination and transfer
- Geomagnetism and Paleomagnetism Studies
- Spacecraft Design and Technology
- Atmospheric and Environmental Gas Dynamics
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
Max Planck Institute for Solar System Research
2014-2024
Institute for Space Astrophysics and Planetology
2021-2024
National Institute for Astrophysics
2021-2024
Université Paris Cité
2024
Laboratoire d’études spatiales et d’instrumentation en astrophysique
2024
Observatoire de Paris
2024
Centre National de la Recherche Scientifique
2024
Sorbonne Université
2024
Université Paris Sciences et Lettres
2024
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2021
Images from the OSIRIS scientific imaging system onboard Rosetta show that nucleus of 67P/Churyumov-Gerasimenko consists two lobes connected by a short neck. The has bulk density less than half water. Activity at distance Sun >3 astronomical units is predominantly neck, where jets have been seen consistently. rotates about principal axis momentum. surface morphology suggests removal larger volumes material, possibly via explosive release subsurface pressure or creation overhangs sublimation,...
Critical measurements for understanding accretion and the dust/gas ratio in solar nebula, where planets were forming 4.5 billion years ago, are being obtained by GIADA (Grain Impact Analyser Dust Accumulator) experiment on European Space Agency's Rosetta spacecraft orbiting comet 67P/Churyumov-Gerasimenko. Between 3.6 3.4 astronomical units inbound, OSIRIS (Optical, Spectroscopic, Infrared Remote Imaging System) detected 35 outflowing grains of mass 10(-10) to 10(-7) kilograms, 48 10(-5)...
Images of comet 67P/Churyumov-Gerasimenko acquired by the OSIRIS (Optical, Spectroscopic and Infrared Remote Imaging System) imaging system onboard European Space Agency’s Rosetta spacecraft at scales better than 0.8 meter per pixel show a wide variety different structures textures. The data importance airfall, surface dust transport, mass wasting, insolation weathering for cometary evolution, they offer some support subsurface fluidization models loss through ejection large chunks material.
We analyzed more than 200 OSIRIS NAC images with a pixel scale of 0.9−2.4 m/pixel comet 67P/Churyumov-Gerasimenko (67P) that have been acquired from onboard the Rosetta spacecraft in August and September 2014 using stereo-photogrammetric methods (SPG). derived improved position pointing data for high-resolution shape model consists about 16 million facets (2 m horizontal sampling) typical vertical accuracy at decimeter scale. From this model, we derive volume northern hemisphere 9.35 km3 ±...
Context. The complex shape of comet 67P and its oblique rotation axis cause pronounced seasonal effects. Irradiation hence activity vary strongly.
Context. We investigate the formation and evolution of comet nuclei other trans-Neptunian objects (TNOs) in solar nebula primordial disk prior to giant planet orbit instability foreseen by Nice model.
ABSTRACT The Rosetta probe, orbiting Jupiter-family comet 67P/Churyumov–Gerasimenko, has been detecting individual dust particles of mass larger than 10 −10 kg by means the GIADA collector and OSIRIS Wide Angle Camera Narrow since 2014 August will continue until 2016 September. Detections single allow us to estimate anisotropic flux from 67P, infer loss rate size distribution at surface sunlit nucleus, see whether 67P evolves in time. velocity orbiter, relative is much lower measured GIADA,...
A spacecraft flyby of an asteroid reveals a high-density body that is more like planetesimal than rubble pile.
Aims. The OSIRIS camera onboard the Rosetta spacecraft has been acquiring images of comet 67P/Churyumov-Gerasimenko (67P)'s nucleus at spatial resolutions down to ~0.17 m/px ever since Aug. 2014. These have yielded unprecedented insight into morphological diversity comet's surface. This paper presents an overview regional morphology 67P.
Context. We present an investigation of the surface properties areas on nucleus comet 67P/Churyumov-Gerasimenko.
Context. The Rosetta mission of the European Space Agency has been orbiting comet 67P/Churyumov-Gerasimenko (67P) since August 2014 and is now in its escort phase. A large complement scientific experiments designed to complete most detailed study a ever attempted are onboard Rosetta.
We study the link between gravitational slopes and surface morphology on nucleus of comet 67P/Churyumov-Gerasimenko provide constraints mechanical properties cometary material. computed for five regions that are representative different morphologies observed surface, using two shape models from OSIRIS images by stereo-photoclinometry (SPC) stereo-photogrammetry (SPG) techniques. estimated tensile, shear, compressive strengths considerations. The show a similar general pattern in terms...
We performed a stereo-photogrammetric (SPG) analysis of more than 1500 Rosetta/OSIRIS NAC images comet 67P/Churyumov-Gerasimenko (67P). The with pixel scales in the range 0.2−3.0 m/pixel were acquired between August 2014 and February 2016. finally derived global high-resolution 3D description 67P's surface, SPG SHAP7 shape model. It consists about 44 million facets (1−1.5 m horizontal sampling) typical vertical accuracy at decimeter scale. Although some taken after perihelion, model can be...
During its 2 yr mission around comet 67P/Churyumov–Gerasimenko, ESA's Rosetta spacecraft had the unique opportunity to follow closely a in most active part of orbit. Many studies have presented typical features associated with activity nucleus, such as localized dust and gas jets. Here, we report on series more energetic transient events observed during 3 months surrounding comet's perihelion passage 2015 August. We detected characterized 34 outbursts cameras, one every 2.4 nucleus...
Before Rosetta, the space missions Giotto and Stardust shaped our view on cometary dust, supported by plentiful data from Earth based observations interplanetary dust particles collected in Earth’s atmosphere. The Rosetta mission at comet 67P/Churyumov-Gerasimenko was equipped with a multitude of instruments designed to study dust. While an abundant amount presented several individual papers, many focused dedicated measurement or topic. Different instruments, methods, sources provide...
Aims.We derive for the first time size-frequency distribution of boulders on a comet, 67P/Churyumov-Gerasimenko (67P), computed from images taken by Rosetta/OSIRIS imaging system.We highlight possible physical processes that lead to these boulder size distributions.Methods.We used acquired OSIRIS Narrow Angle Camera, NAC, 5 and 6 August 2014.The scale (2.44-2.03m/px) is such ≥7 m can be identified manually extracted datasets with software ArcGIS.We derived both global localized...
Dust jets, i.e. fuzzy collimated streams of cometary material arising from the nucleus, have been observed in-situ on all comets since Giotto mission flew by comet 1P/Halley in 1986. Yet their formation mechanism remains unknown. Several solutions proposed, localized physical mechanisms surface/sub-surface (see review Belton (2010)) to purely dynamical processes involving focusing gas flows local topography (Crifo et al. 2002). While latter seems be responsible for larger features, high...
We collect observational evidence that supports the scheme of mass transfer on nucleus comet 67P/Churyumov-Gerasimenko. The obliquity rotation axis 67P causes strong seasonal variations. During perihelion southern hemisphere is four times more active than north. Northern territories are widely covered by granular material indicates back fall originating from south. Decimetre sized chunks contain water ice and their trajectories influenced an anti-solar force instigated sublimation. OSIRIS...
Since OSIRIS started acquiring high-resolution observations of the surface nucleus comet 67P/Churyumov-Gerasimenko, over one hundred meter-sized bright spots have been identified in numerous types geomorphologic regions, but mostly located areas receiving low insolation. The are either clustered, debris fields close to decameter-high cliffs, or isolated without structural relation surrounding terrain. They can be up ten times brighter than average at visible wavelengths and display a...
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...