E. Kührt
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View article: Wind measurements and dynamics in Venus’ upper atmosphere measured by high-resolution terahertz spectroscopy of atomic oxygen
Wind measurements and dynamics in Venus’ upper atmosphere measured by high-resolution terahertz spectroscopy of atomic oxygen Open
Atomic oxygen is important for the photochemistry in the mesosphere and thermosphere of Venus and can be used as tracer for atmospheric dynamics. The altitude range where it predominantly occurs is between 90 km and 130 km with a peak at 1…
View article: CO2-driven surface changes in the Hapi region on Comet 67P/Churyumov–Gerasimenko
CO2-driven surface changes in the Hapi region on Comet 67P/Churyumov–Gerasimenko Open
Between 2014 December 31 and 2015 March 17, the OSIRIS cameras on Rosetta documented the growth of a $140\, \mathrm{\hbox{-}m}$ wide and $0.5\, \mathrm{\hbox{-}m}$ deep depression in the Hapi region on Comet 67P/Churyumov–Gerasimenko. This…
Cometary dust analogues for physics experiments Open
The CoPhyLab (Cometary Physics Laboratory) project is designed to study the physics of comets through a series of earth-based experiments. For these experiments, a dust analogue was created with physical properties comparable to those of t…
Mid-infrared emissivity of partially dehydrated asteroid (162173) Ryugu shows strong signs of aqueous alteration Open
The near-Earth asteroid (162173) Ryugu, the target of Hayabusa2 space mission, was observed via both orbiter and the lander instruments. The infrared radiometer on the MASCOT lander (MARA) is the only instrument providing spectrally resolv…
The CoPhyLab comet-simulation chamber Open
The Comet Physics Laboratory (CoPhyLab) is an international research program to study the physical properties of cometary analog materials under simulated space conditions. The project is dedicated to studying, with the help of multiple in…
Parent body of (162173) Ryugu: High porosity, early accretion, small size Open
Introduction: Observations of C-type NEAs and properties of carbonaceous chondrites indicate a high porosity of C-type asteroids. Hayabusa2 demonstrated that Ryugu is a low-density rubble-pile[1] dominated by large surface boulders[2]. Bou…
Chang’E‐4 Rover Spectra Revealing Micro‐scale Surface Thermophysical Properties of the Moon Open
Lunar surface temperature variations provide key information about the thermophysical properties of the regolith. To date, temperatures have been measured using telescopes and orbiter instruments, providing information from mid‐infrared to…
CoPhyLab: recent and future experiments - an overview Open
CoPhyLabLaboratory experiments are of major importance to understand the activity of comets and to support future space missions. However, past comet simulation experiments were performed under the assumption that comets are mainly compose…
Tensile strength of dust-ice mixtures and their relevance as cometary analog material Open
Aims. The tensile strength of granular matter is of great importance to our understanding of the evolution of comets and to our attempts to reproduce processes on cometary surfaces in laboratory experiments. In this work, we investigate th…
Time evolution of dust deposits in the Hapi region of comet 67P/Churyumov-Gerasimenko Open
Aims. We provide a measurement of the seasonal evolution of the dust deposit erosion and accretion in the Hapi region of comet 67P/Churyumov-Gerasimenko with a vertical accuracy of 0.2–0.9 m. Methods. We used OSIRIS Narrow Angle Camera ima…
Cometary Nuclei—From Giotto to Rosetta Open
We will briefly recapitulate the beginning of modern cometary physic. Then we will assess the results of the cometary flyby missions previous to ESA’s Rosetta rendezvous with comet 67P/Churyumov–Gerasimenko. Emphasis is given to the physic…
View article: Magnetic Properties of Asteroid (162173) Ryugu
Magnetic Properties of Asteroid (162173) Ryugu Open
Observations of the magnetization state of asteroids indicate diverse properties. Values between 1.9 10 Am /kg (Eros) and 10 Am /kg (Braille) have been reported. A more detailed understanding of asteroidal magnetic properties allows far‐re…
Experimental simulation of cometary surfaces using volatile-rich analogue materials Open
Cometary surfaces are shaped through the process of activity when the comet approaches the sun and the sublimation of volatiles removes dust and gases. Recently, the ESA Rosetta mission showed the geomorphologic diversity of comet 67P/Chur…
A comparison of multiple Rosetta data sets and 3D model calculations of 67P/Churyumov-Gerasimenko coma around equinox (May 2015) Open
Numerical models are powerful tools for understanding the connection between the emitted gas and dust from the surface of comets and the subsequent expansion into space where remote sensing instruments can perform measurements. We will pre…
Effects of dust layers on thermal emission from airless bodies Open
: We have investigated the influence of thin thermally opaque dust layers on the thermal emission of rocks and regolith and determined the thermal response of these dust-covered surfaces to diurnal insolation cycles. Results are computed f…
On understanding multi-instrument Rosetta data of the innermost dust and gas coma of comet 67P/Churyumov-Gerasimenko - results, strengths, and limitations of models Open
Numerical models are powerful tools for understanding the connection between the emitted gas and dust from the surface of comets and the subsequent expansion into space where remote sensing instruments can perform measurements. We will pre…
A comparison of multiple Rosetta data sets and 3D model calculations of 67P/Churyumov-Gerasimenko coma around equinox (May 2015) Open
We have used the latest available shape model for gas and dust simulations of the inner coma of comet 67P/Churyumov-Gerasimenko for the period around May 2015 (equinox). We compare results from a purely insolation-driven model with a compl…
Constraining models of activity on comet 67P/Churyumov-Gerasimenko with Rosetta trajectory, rotation, and water production measurements Open
Aims. We use four observational data sets, mainly from the Rosetta mission, to constrain the activity pattern of the nucleus of comet 67P/Churyumov-Gerasimenko. Methods. We develop a numerical model that computes the production rate and no…
Seasonal variations in source regions of the dust jets on comet 67P/Churyumov-Gerasimenko Open
Aims. We investigate the surface distribution of the source regions of dust jets on comet 67P/Churyumov-Gerasimenko as a function of time. Methods. The dust jet source regions were traced by the comprehensive imaging data set provided by t…