Search Publications
Transmission Electron Microscopy of CONCORDIA UltraCarbonaceous Antarctic MicroMeteorites (UCAMMs): Mineralogical properties
Engrand, C.; Rouzaud, J. -N.; Duprat, J. +2 more
We performed mineralogical and petrographic studies of three UltraCarbonaceous Antarctic Micrometeorites (UCAMMs) by analytical transmission electron microscopy (TEM). The UCAMMs were identified in the CONCORDIA micrometeorite collection (2002 and 2006) recovered from central Antarctic snow, and are of probable cometary origin. UCAMMs are dominate…
The calculation of Afρ and mass loss rate for comets
Rubin, Martin; Fink, Uwe
Ab initio calculations of Afρ are presented using Mie scattering theory and a Direct Simulation Monte Carlo (DSMC) dust outflow model in support of the Rosetta mission and its target 67P/Churyumov-Gerasimenko (CG). These calculations are performed for particle sizes ranging from 0.010 µm to 1.0 cm. The present status of our knowledge of vari…
Atomic model of the type III secretion system needle
Baker, David; Loquet, Antoine; Sgourakis, Nikolaos G. +8 more
Pathogenic bacteria using a type III secretion system (T3SS) to manipulate host cells cause many different infections including Shigella dysentery, typhoid fever, enterohaemorrhagic colitis and bubonic plague. An essential part of the T3SS is a hollow needle-like protein filament through which effector proteins are injected into eukaryotic host ce…
Interpretation of combined infrared, submillimeter, and millimeter thermal flux data obtained during the Rosetta fly-by of Asteroid (21) Lutetia
Capaccioni, F.; Lee, S.; Hofstadter, M. +9 more
The European Space Agency’s Rosetta spacecraft is the first Solar System mission to include instrumentation capable of measuring planetary thermal fluxes at both near-IR (VIRTIS) and submillimeter-millimeter (smm-mm, MIRO) wavelengths. Its primary mission is a 1 year reconnaissance of Comet 67P/Churyumov-Gerasimenko beginning in 2014. During a 201…
The nucleus of Comet 67P/Churyumov-Gerasimenko. A new shape model and thermophysical analysis
Lowry, S.; Snodgrass, C.; Green, S. F. +5 more
Context. Comet 67P/Churyumov-Gerasimenko is the target of the European Space Agency Rosetta spacecraft rendez-vous mission. Detailed physical characteristation of the comet before arrival is important for mission planning as well as providing a test bed for ground-based observing and data-analysis methods.
Aims: To conduct a long-term observa…
The geomorphology of (21) Lutetia: Results from the OSIRIS imaging system onboard ESA's Rosetta spacecraft
Jorda, L.; Stephan, K.; Lamy, P. +27 more
The surface of (21) Lutetia is highly complex with significant interactions between ancient and more recent structures. This work attempts to summarize the surface geomorphology observed using the high resolution images from OSIRIS, the imaging system onboard the European Space Agency's Rosetta spacecraft. A wide range of surface morphologies are …
Boulders on Lutetia
Lara, L. M.; Bertaux, J. -L.; Lamy, P. +37 more
More than 200 boulders are among the many prominent geological features seen on Lutetia by the OSIRIS cameras onboard Rosetta. Most are concentrated around the central crater in Baetica regio with a few more apparently associated with Patavium crater. The size range of boulders visible to OSIRIS is about 60-300 m. We model the trajectories of boul…
Narrow Dust Jets in a Diffuse Gas Coma: A Natural Product of Small Active Regions on Comets
Combi, M. R.; Fougere, N.; Gombosi, T. I. +2 more
Comets often display narrow dust jets but more diffuse gas comae when their eccentric orbits bring them into the inner solar system and sunlight sublimates the ice on the nucleus. Comets are also understood to have one or more active areas covering only a fraction of the total surface active with sublimating volatile ices. Calculations of the gas …
Shape modeling technique KOALA validated by ESA Rosetta at (21) Lutetia
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +44 more
We present here a comparison of our results from ground-based observations of asteroid (21) Lutetia with imaging data acquired during the flyby of the asteroid by the ESA Rosetta mission. This flyby provided a unique opportunity to evaluate and calibrate our method of determination of size, 3-D shape, and spin of an asteroid from ground-based obse…
Radar properties of comets: Parametric dielectric modeling of Comet 67P/Churyumov-Gerasimenko
Kofman, Wlodek; Heggy, Essam; Palmer, Elizabeth M. +3 more
In 2014, the European Space Agency’s Rosetta mission is scheduled to rendezvous with Comet 67P/Churyumov-Gerasimenko (Comet 67P). Rosetta’s CONSERT experiment aims to explore the cometary nucleus’ geophysical properties using radar tomography. The expected scientific return and inversion algorithms are mainly dependent on our understanding of the …