Search Publications
A first assessment of the strength of cometary particles collected in-situ by the COSIMA instrument onboard ROSETTA
Langevin, Yves; Della Corte, Vincenzo; Hornung, Klaus +9 more
Soon after the arrival of the ROSETTA spacecraft at Comet 67/P Churyumov-Gerasimenko the onboard instrument COSIMA ("Cometary Secondary Ion Mass Analyzer") collected a large number of cometary dust particles on targets from gold black of thickness between 10 and 30 µm. Inspection by its camera subsystem revealed that many of them consist of …
ROSETTA lander Philae: Touch-down reconstruction
Roll, Reinhard; Witte, Lars
The landing of the ROSETTA-mission lander Philae on November 12th 2014 on Comet 67 P/Churyumov-Gerasimenko was planned as a descent with passive landing and anchoring by harpoons at touch-down. Actually the lander was not fixed at touch-down to the ground due to failing harpoons. The lander internal damper was actuated at touch-down for 42.6 mm wi…
Polarimetry observations of comets: Status, questions, future pathways
Hines, Dean C.; Levasseur-Regourd, Anny-Chantal
Polarimetric observations of comets have provided crucial insight into the composition and evolution of cometary dust particles. Herein, we present a brief overview of the polarization properties observed in comets, and some possible interpretations. We also discuss recent imaging polarimetry observations of C/2012 S1 (ISON) and 67P/Churyumov-Gera…
A simple model for understanding the DIM dust measurement at comet 67P/Churyumov-Gerasimenko
Flandes, Alberto; Krüger, Harald; Della Corte, Vincenzo +1 more
We present a simple model for gas and dust flow from 67P/Churyumov-Gerasimenko that can be used to understand the grain impact observed by the DIM instrument on Philae (Krüger et al., 2015). We show how model results when applied to the GIADA measurements (Rotundi et al., 2015; Della Corte et al., 2015) can be used, in conjunction with the results…
Planetary heat flow from shallow subsurface measurements: Mars
Hagermann, Axel; Cornwall, Marc
Planetary heat flow probes measure heat flow (depth-resolved temperature and thermal conductivity) to provide insight into the internal state of a planet. The probes have been utilized extensively on Earth, twice on the Moon, and once on the Surface of comet 67P-CG. Mars is an important target for heat flow measurement as heat flow is a critical p…
Comet 67P/Churyumov-Gerasimenko, location of pristine material?
Kossacki, Konrad J.
This work is intended to answer the question, whether on comet 67P/Churyumov-Gerasimenko pristine, not hardened material can be locally preserved close to the surface. Simulated is the thermally driven sintering of ice-dust grains underlying the dust mantle. Considered is the Ma'at region located at the north side of the small lobe Head. It is sho…
Corrigendum to "Comet 67P/Churyumov-Gerasimenko, location of pristine material?" [Planet. Space Sci. 125 (2016) 96-104]
kossacki, Konrad J.
In this paper was investigated evolution of the material structure in selected locations on the nucleus of comet 67P/Churyumov-Gerasimenko. The shape of the surface was described by the shape model SHAP4s v1.0. The considered locations i.e. sectors of the surface were marked in Fig. 1.
Interfacial Tension-Driven Differentiation-(ITDD) may result in a low-density central region inside kilometer-sized bodies
Arias, Francisco J.
Interfacial Tension-Driven Differentiation, (ITDD), and its possible significance with regards to the interior structures of kilometer-sized bodies is discussed. Using a simple physical and geometrical model, an analytical expression for the conditions in which ITDD can occur is derived. It is shown that ITDD coupled with internal convection can l…