Search Publications
Two methods for determining the temperature on the surface of the cometary nucleus based on spectroscopic measurements
Wesołowski, Marcin; Potera, Piotr; Kucab, Krzysztof
The paper presents two methods that can be used to determine the surface temperature of a cometary nucleus. The key role in this approach is played by the measurement of hemispherical albedo for selected dust analogues, which was performed using a Cary 5000 spectrometer. To most accurately reflect the actual structure of the dust layer present on …
The refractory-to-ice ratio in comet 67P: Implications on the composition of the comet-forming region of the protoplanetary disk
Morbidelli, Alessandro; Marschall, Raphael; Marrocchi, Yves
Comets, asteroids, and other small bodies are thought to be remnants of the original planetesimal population of the Solar System. As such, their physical, chemical, and isotopic properties hold crucial details on how and where they formed and how they evolved. Yet, placing precise constraints on the formation region of these bodies has been challe…
Key structural characteristics of porous layers in diffusion modelling: A study on polydispersity, shape, and hierarchy
Skorov, Yuri; Reshetnyk, Volodymyr; Blum, Jürgen +5 more
In this study, we explored various open-source models for generating porous media. These models enabled us to examine different types of porous beds, including layers of polydisperse spheres with various size distributions, layers of porous aggregates – either fragments of parent porous layers or those formed during the agglomeration of polydisper…
Geomorphological study of the gullies in Penticton Crater, Mars: Classification and origin
Natarajan, Varsha; K N, Kusuma; Nandana, D. Lekshmi
Penticton crater, a southern hemisphere mid-latitude crater on Mars, is covered with features that are typical examples of Martian gullies that resemble the terrestrial gullies on Earth. We studied the gullies present in the Penticton crater, classified them and interpreted their formation mechanism using a remote sensing approach. A wide variety …
A fully kinetic perspective on weakly active comets: Asymmetric outgassing
Henri, Pierre; Galand, Marina; Divin, Andrey +3 more
The European Space Agency's Rosetta mission measured the complex plasma environment surrounding comet 67P/Churyumov-Gerasimenko for more than two years. In this work, the collisionless dynamics of the plasma interaction during the comet's weakly outgassing phases is investigated through a fully kinetic semi-implicit particle-in-cell approach. The …
The Visual Monitoring Camera (VMC) on Mars Express: A new science instrument made from an old webcam orbiting Mars
Hernández-Bernal, Jorge; Cardesín-Moinelo, Alejandro; Hueso, Ricardo +17 more
The Visual Monitoring Camera (VMC) is a small imaging instrument onboard Mars Express with a field of view of ∼40°x30°. The camera was initially intended to provide visual confirmation of the separation of the Beagle 2 lander and has similar technical specifications to a typical webcam of the 2000s. In 2007, a few years after the end of its origin…
Modeling the interstellar dust detections by DESTINY+
Kimura, Hiroshi; Trieloff, Mario; Krüger, Harald +11 more
The DESTINY
Structural study of graben within the Margaritifer Terra region of Mars
Dasgupta, Dipayan; Kundu, Abhik; Basu, Supratik +1 more
The surface of Mars preserves a variety of structural and geomorphic features such as wrinkle ridges, graben, lobate scarps, impact basins, paleochannels etc., which owe their origin to endogenic processes of deformation as well as meteorite impacts. Graben, which form in extensional stress regimes, are one of the most common structural features i…
Applying machine learning to a nonlinear spectral mixing model for mapping lunar soils composition using CHANDRAYAAN-1 M3 data
Mall, Urs; Surkov, Yehor; Kaydash, Vadym +4 more
We present a newly developed method which combines the nonlinear spectral mixing model of Shkuratov et al. (1999) with a machine learning algorithm to map the lunar regolith composition using spectral data. The new method performs orders of magnitude faster than the traditionally used numerical optimization approaches, allowing the mapping of rego…
Investigation and cartographic representation of Hyperion space images photogrammetric processing results
Nadezhdina, I. E.; Sokolov, A. I.; Nyrtsov, M. V. +1 more
In this paper a new body-fixed coordinate system, based on the results of the processing of saturnian satellite Hyperion surface data, obtained by the Cassini spacecraft and proving the chaotic nature of this satellite rotation, was constructed. In this coordinate system, an approximating triaxial ellipsoid is defined, as well as global orthomosai…