K. Stephan
A5069582259- Astro and Planetary Science
- Planetary Science and Exploration
- Space Exploration and Technology
- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Stellar, planetary, and galactic studies
- Spacecraft and Cryogenic Technologies
- Geochemistry and Geologic Mapping
- Geological and Geochemical Analysis
- Geomagnetism and Paleomagnetism Studies
- Maritime and Coastal Archaeology
- Astrophysics and Star Formation Studies
- Marine and environmental studies
- Scientific Research and Discoveries
- Astronomy and Astrophysical Research
- Methane Hydrates and Related Phenomena
- Archaeology and ancient environmental studies
- Space Satellite Systems and Control
- Historical Astronomy and Related Studies
- Gamma-ray bursts and supernovae
- Geological Modeling and Analysis
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- Ancient and Medieval Archaeology Studies
- Space Science and Extraterrestrial Life
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2015-2024
Planet
2014-2023
Laboratoire de Chimie Moléculaire et Thioorganique
2023
Software (Spain)
2023
Institut für Zuckerrübenforschung
2023
Dienstleistungszentrum Ländlicher Raum
2021
Institut für Lungenforschung
2014-2020
Johns Hopkins University Applied Physics Laboratory
2020
Planetary Science Institute
2007-2018
Institute for Space Astrophysics and Planetology
2016
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...
We report the identification of compounds on Titan's surface by spatially resolved imaging spectroscopy methods through atmosphere, and set upper limits to other organic compounds. present evidence for deposits solid benzene (C 6 H ), and/or liquid ethane 2 or methane (CH 4 clouds hydrogen cyanide (HCN) aerosols using diagnostic spectral features in data from Cassini Visual Infrared Mapping Spectrometer (VIMS). Cyanoacetylene (2‐propynenitrile, IUPAC nomenclature, HC 3 N) is indicated...
After more than 50 close flybys of Titan by the Cassini spacecraft, it has become evident that features similar in morphology to terrestrial lakes and seas exist Titan's polar regions. As progresses into northern spring, much numerous larger north‐polar region suggested RADAR data, are becoming directly illuminated for first time since arrival spacecraft. This allows optical instruments search specular reflections provide further confirmation liquids present these lakes. On July 8, 2009 VIMS...
Landing on the surface of Ryugu In October 2018, Hayabusa2 spacecraft dropped Mobile Asteroid Surface Scout (MASCOT) lander onto asteroid (162173) Ryugu. Jaumann et al. analyzed images taken by MASCOT camera during its descent and when resting surface. Colored light-emitting diodes were used to illuminate lander's surroundings at night produce color images. Ryugu's is dominated two types rock, but there no evidence for fine-grained dust. Millimeter-sized inclusions in rocks are similar those...
Abstract The MAJIS (Moons And Jupiter Imaging Spectrometer) instrument on board the ESA JUICE (JUpiter ICy moon Explorer) mission is an imaging spectrometer operating in visible and near-infrared spectral range from 0.50 to 5.55 μm two channels with a boundary at 2.3 samplings for VISNIR IR better than 4 nm/band 7 nm/band, respectively. IFOV 150 μrad over total of 400 pixels. As already amply demonstrated by past present operative planetary space missions, this type can span wide scientific...
Abstract The Dawn spacecraft mission has provided extensive new and detailed data on Vesta that confirm strengthen the Vesta–howardite–eucrite–diogenite ( HED ) meteorite link concept is differentiated, as derived from earlier telescopic observations. Here, we present results by newly calibrated spectra of Vesta. comparison between imaging spectrometer— VIR —and different class meteorites shows average spectrum resembles howardite spectra. Nevertheless, at high spatial resolution reveal...
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...