A5047071378- Astro and Planetary Science
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Space Exploration and Technology
- Space Science and Extraterrestrial Life
- Nuclear Physics and Applications
- Geomagnetism and Paleomagnetism Studies
- Atmospheric Ozone and Climate
- Spacecraft Design and Technology
- Astronomical and nuclear sciences
- Geophysics and Gravity Measurements
- Calibration and Measurement Techniques
- Spacecraft and Cryogenic Technologies
- Mass Spectrometry Techniques and Applications
- Earthquake Detection and Analysis
- Gamma-ray bursts and supernovae
- Image Processing and 3D Reconstruction
- Stellar, planetary, and galactic studies
- Geochemistry and Geologic Mapping
- Atomic and Molecular Physics
- Marine and environmental studies
- Radioactive contamination and transfer
- Astrophysics and Star Formation Studies
Max Planck Institute for Solar System Research
2015-2024
Planet
2018-2020
Max Planck Society
2008-2019
Brown University
2006
Max Planck Institute for Astronomy
1997-2004
University of Bern
1992-1993
The detection of glycine and phosphorus in the coma 67P shows that comets contain all ingredients to help spark life on Earth.
The provenance of water and organic compounds on Earth other terrestrial planets has been discussed for a long time without reaching consensus. One the best means to distinguish between different scenarios is by determining deuterium-to-hydrogen (D/H) ratios in reservoirs comets Earth’s oceans. Here, we report direct situ measurement D/H ratio Jupiter family comet 67P/Churyumov-Gerasimenko ROSINA mass spectrometer aboard European Space Agency’s Rosetta spacecraft, which found be (5.3 ± 0.7)...
Comets contain the best-preserved material from beginning of our planetary system. Their nuclei and comae composition reveal clues about physical chemical conditions during early solar system when comets formed. ROSINA (Rosetta Orbiter Spectrometer for Ion Neutral Analysis) onboard Rosetta spacecraft has measured coma comet 67P/Churyumov-Gerasimenko with well-sampled time resolution per rotation. Measurements were made over many rotation periods a wide range latitudes. These measurements...
Molecular nitrogen (N2) is thought to have been the most abundant form of in protosolar nebula. It main N-bearing molecule atmospheres Pluto and Triton probably reservoir from which giant planets formed. Yet comets, often considered primitive bodies solar system, N2 has not detected. Here we report direct situ measurement Jupiter family comet 67P/Churyumov-Gerasimenko, made by Rosetta Orbiter Spectrometer for Ion Neutral Analysis mass spectrometer aboard spacecraft. A N2/CO ratio (5.70 ±...
The origin of cometary matter and the potential contribution comets to inner-planet atmospheres are long-standing problems. During a series dedicated low-altitude orbits, Rosetta Orbiter Spectrometer for Ion Neutral Analysis (ROSINA) on spacecraft analyzed isotopes xenon in coma comet 67P/Churyumov-Gerasimenko. isotopic composition shows deficits heavy matches that primordial atmospheric component. present-day Earth atmosphere contains 22 ± 5% xenon, addition chondritic (or solar) xenon.
ABSTRACT Comets are considered to be some of the most pristine and unprocessed Solar system objects accessible in situ exploration. Investigating their molecular elemental composition takes us on a journey back early period our possibly even further. In this work, we deduce bulk abundances major volatile species comet 67P/Churyumov-Gerasimenko, target European Space Agency’s (ESA) Rosetta mission. The basis measurements obtained with ROSINA instrument suite board orbiter during suitable high...
ROSINA/DFMS shows that comets of type 67P/CG likely did not significantly contribute to Earth’s volatile budget.
67P/Churyumov-Gerasimenko (67P) is a Jupiter-family comet and the object of investigation European Space Agency mission Rosetta. This report presents first full 3D simulation results 67P's neutral gas coma. In this study we include from direct Monte Carlo method, hydrodynamic code, purely geometric calculation which computes total illuminated surface area on nucleus. All models triangulated shape model 67P as well realistic illumination shadowing conditions. The basic concept assumption that...
Abstract. The advanced energetic particle spectrometer RAPID on board Cluster can provide a complete description of the relevant parameters velocity, V , and atomic mass, A, over an energy range from 30 keV up to 1.5 MeV. We present first measurements taken by during commissioning early operating phases. orbit 14 January 2001, when was travelling perigee near dawn northward across pole towards apogee in solar wind, is used demonstrate capabilities investigating wide variety populations....
In situ mass spectrometry has been a powerful tool in many space missions to investigate atmospheres and exospheres of different bodies the solar system. Applying new technologies, spectrometers have become increasingly more sensitive. this study, we show that spacecraft outgassing, which can never be completely prevented, will limiting factor future very tenuous moons, asteroids, or comets at large heliocentric distances. The Rosetta Orbiter Spectrometer for Ion Neutral Analysis (ROSINA)...
As the spin axis of comet 67P/Churyumov–Gerasimenko (67P) is not normal to orbital plane, 67P has strong seasonal changes in illumination conditions on nucleus' surface, with a short and intense summer Southern hemisphere. We have been monitoring these variations gas coma Rosetta Orbiter Spectrometer for Ion Neutral Analysis (ROSINA) instrument suite aboard ESA's spacecraft. followed from its rendezvous 2014 August, distance almost 3.5 au Sun, through perihelion at 1.24 au, away Sun again....
Context. Early measurements of Rosetta's target comet, 67P/Churyumov-Gerasimenko (67P), showed a strongly heterogeneous coma in H2O, CO, and CO2.
Abstract Past exploration missions have revealed that the lunar topography is eroded through mass wasting processes such as rockfalls and other types of landslides, similar to Earth. We analyzed an archive more than 2 million high-resolution images using AI big data-driven approach created first global map 136.610 rockfall events. Using this map, we show primarily driven by impacts impact-induced fracture networks. further identify a large number currently unknown clusters, potentially...
We report the first in situ detection of halogens a cometary coma, that 67P/Churyumov-Gerasimenko. Neutral gas mass spectra collected by European Space Agency's Rosetta spacecraft during four periods interest from comet encounter up to perihelion indicate main halogen-bearing compounds are HF, HCl and HBr. The bulk elemental abundances relative oxygen ∼8.9 × 10−5 for F/O, ∼1.2 10−4 Cl/O ∼2.5 10−6 Br/O, volatile fraction comet. isotopic ratios 37Cl/35Cl 81Br/79Br match Solar system values...
Aims. Far away from the Sun, at around 3 AU, activity of comet 67P/Churyumov-Gerasimenko is low and changes with local time (solar insolation), location (chemical heterogeneity surface), season. When very because total cross section against Sun small, solar wind has access to surface causes ion-induced sputtering material, which we wish observe.
The analysis of rockfall distribution and magnitude is a useful tool to study the past current endogenic exogenic activity Mars. At same time, tracks left by rockfalls provide insights into mechanical properties Martian surface. While wealth high-resolution spaceborne image data are available, manual mapping displaced boulders with inefficient slow, resulting in: 1) small total number mapped features; 2) inadequate statistics; 3) suboptimal utilization available big data. This implements...
Context. The Rosetta encounter with comet 67P/Churyumov-Gerasimenko provides a unique opportunity for an in situ, up-close investigation of ion-neutral chemistry the coma weakly outgassing far from Sun.
The ion composition in the Jovian environment was investigated with Solar Wind Ion Composition Spectrometer on board Ulysses. A hot tenuous plasma observed throughout outer and middle magnetosphere. In some regions two thermally different components were identified. Oxygen sulfur ions several charge states, from volcanic satellite lo, make largest contribution to mass density of plasma, even at high latitude. wind particles all investigated. Ions Jupiter's ionosphere abundant magnetosphere,...