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23 results on '"Stephan, Katrin"'

1. The JUICE mission and the future exploration of the icy Galilean satellites: Complementarities and synergies in visible and near-infrared remote sensing

Author

Tosi, F., Roatsch, Thomas, Cremonese, Gabriele, Fonti, S., Palumbo, P., Stephan, Katrin, Jaumann, Ralf, Migliorini, A., Hoffmann, Harald, Mancarella, F., Altieri, F., Carli, Cristian, Ciarniello, M., Lucchetti, A., Piccioni, G., Zambon, F., Galluzzi, Valentina, Della Corte, Vincenzo, and Gacomini, L.

Subjects
Planetengeologie, JUICE
Published
2018

2. The Spectral Nature of Titan's Major Geomorphological Units

Author

Solomonidou, A., Coustenis, A., Lopes, R.M.C., Malaska, M. J., Rodriguez, S., Altobelli, N., Drossart, P., Elachi, Charles, Schmitt, B., Janssen, Michael A., Wall, S., Sotin, C., Lawrence, K.J., Radebaugh, J., Stephan, Katrin, Brown, Robert H., LeMouelic, Stephane, Le Gall, Alice, Witasse, Olivier, and Matsoukas, C.

Subjects
Planetengeologie, VIMS, Cassini, Titan
Published
2018

6. Titan's Major Geomorphological Units: Their Spectral and Morphological Nature

Author

Solomonidou, A., Coustenis, A., Drossart, P., Brown, Robert H., Stephan, Katrin, Altobelli, N., Sotin, C., Lawrence, K.J., Le Mouelic, S., Rodriguez, S., Schmitt, B., Le Gall, Alice, Elachi, Charles, Lopes, R.M.C., Witasse, Olivier, Radebaugh, J., Wall, S., Malaska, M. J., Janssen, M., and Matsoukas, C.

Subjects
Planetengeologie, VIMS, Cassini, Titan
Published
2018

7. Experimental Assessment of the High Reflectance Pitted Terrains on Vesta

Author

Michalik, Tanja, Otto, Katharina A., Jaumann, Ralf, Maturilli, Alessandro, Helbert, Jörn, Krohn, Katrin, Kührt, Ekkehard, Matz, Klaus-Dieter, Preusker, Frank, Schröder, Stefan E., and Stephan, Katrin

Subjects
Asteroiden und Kometen, Planetengeologie, Volatiles, Vesta, Leitungsbereich PF, Planetengeodäsie, Pitted Terrains, HED, Asteroids, Dawn
Published
2018

9. Spectral Investigation of Quadrangle Ac-H-3 of the Dwarf Planet Ceres - The Region of Impact Crater Dantu

Author

Stephan, Katrin, Jaumann, R., Zambon, F., Carrozzo, F. G., Desanctis, M.C., Tosi, F., Ammannito, E., Longobardo, A, Palomba, E., McFadden, L.A., Krohn, Katrin, Williams, D.A., Raponi, A., Ciarniello, M., Combe, J.-P., Frigeri, A., Roatsch, Thomas, Matz, Klaus-Dieter, Preusker, Frank, Raymond, C.A., and Russell, C.T.

Subjects
Planetengeologie, composition, Ceres, Dawn
Published
2017

10. Morphology of Cryogenic Flows and Channels on Dwarf Planet Ceres

Author

Krohn, Katrin, Jaumann, R., Otto, Katharina, von der Gathen, Isabel, Matz, K.-D., Buczkowski, D.L., Williams, D.A., Pieters, C., Preusker, Frank, Roatsch, Thomas, Stephan, Katrin, Wagner, Roland, Russell, C.T., and Raymond, C.A.

Subjects
Planetengeologie, asteroids, geology, cryovolcanism, dwarf planet
Published
2016

12. Constraints on the nature of various Titan Geomorphological Units with Cassini/VIMS and SAR

Author

Solomonidou, Anezina, Coustenis, Athena, Lopes, Rosaly M. C., Rodriguez, Sébastien, Schmitt, Bernard, Philippe, Sylvain, Malaska, Michael, Lawrence, Kenneth J., Janssen, Michael A., Le Gall, Alice, Jaumann, Ralf, Sohl, Frank, Stephan, Katrin, Drossart, Pierre, Brown, Robert H., Maltagliati, Luca, Bratsolis, Emmanuel, Matsoukas, Christos, Jet Propulsion Laboratory (JPL), California Institute of Technology (CALTECH)-NASA, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), Centre National d'Études Spatiales [Toulouse] (CNES)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), ESTER - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), IMPEC - LATMOS, DLR Institute of Planetary Research, German Aerospace Center (DLR), Lunar and Planetary Laboratory [Tucson] (LPL), University of Arizona, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), PLANETO - LATMOS, NASA-California Institute of Technology (CALTECH), and Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112))

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Planetengeologie, Planetenphysik, [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], Titan
Abstract

International audience; We investigate the lower atmosphere of Titan from Visual and Infrared Mapping Spectrometer (VIMS) spectro-imaging data by use of a recently updated radiative transfer code in the near-IR range and RADAR/SAR data for the distinction of geomorphological units. We focus here on the geological major units identified in [1;2] and [3]: mountains, plains, labyrinths, dune fields, and possible cryovolcanic and/or evaporitic features (the latter two are albedo features, [4;5;6]). We infer surface properties (like absolute surface albedo and morphology) and atmospheric contributions, in particular the haze content. We find that the Huygens landing site and the candidate evaporitic regions pair compositionally with the variable plains, thus indicating that units of significant geomorphological differences seem to consist of very similar materials. Similarly for the labyrinth terrains and the undifferentiated plains. On the contrary, many regions from the same geomorphological unit show compositional variations depending on location (i.e. undifferentiated plains). These differences provide implications on the endogenic or exogenic origin of the various units. In previous studies we showed that the processes most likely linked to the formation of the various geomorphological units are aeolian, fluvial, sedimentary, and lacustrine, in addition to the deposition of organics through the atmosphere. Currently, we are working on deriving information on the chemical composition of the aforementioned regions from the extracted surface albedos using an extensive library of ices and tholins [e.g. 7]. This will shed light on the potential formation processes (Solomonidou et al. in prep.). Preliminary results on the chemical composition of the regions that have shown temporal changes (i.e. Tui Regio and Sotra Patera; [6]) are also presented.References: [1] Lopes, R.M.C., et al.: Icarus, 205, 540-558, 2010; [2] Lopes, R.M.C., et al.: Icarus, 270, 162-182, 2016; [3] Malaska, M., et al.: Icarus, 270, 130-161, 2016; [4] Barnes, J., et al.: Pl. Scie., 2:1, 2013; [5] Solomonidou, A., et al.: JGR, 119, 1729-1747, 2014; [6] Solomonidou, A., et al.: Icarus, 270, 85-99, 2016; [7] Schmitt, B., et al.: GhoSST database (ghosst.osug.fr).

Published
2016

13. Europa Habitability and Extant Life Exploration with Combined Flyby-Lander-Orbiter Mission

Author

Blanc, M., Jones, G.H., Prieto-Ballesteros, O., Mimoun, D., Masters, A., Kempf, S., Iess, L., Martins, Z., Lorenz, R., Lasue, J., André, N., Bills, B.G., Choblet, G., Collins, G., Cremonese, G., Garnier, P, Hand, K., Hartogh, P, Khurana, K., Stephan, Katrin, Tosi, F., Vance, S., Van Hoolst, T., Westall, F., Wolwerk, M, Cooper, J. F., Sittler, E. C., Brinckerhoff, W., Hurford, T.A., and Europa, Initative

Subjects
Planetengeologie, Europa
Published
2016

14. Surface changes in mid-latitude regions on Titan

Author

Solomonidou, Anezina, Coustenis, Athéna, Lopes, Rosaly M. C., Hirtzig, Mathieu, Rodriguez, Sebastien, Stephan, Katrin, Sotin, Christophe, Drossart, Pierre, Lawrence, Kenneth J., Le Mouélic, Stéphane, Bratsolis, Emmanuel, Jaumann, Ralf, Brown, Robert H., Malaska, Michael J., Henry, Florence, Jet Propulsion Laboratory, California Institute of Technology (JPL), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Fondation La main à la pâte, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Deutsches Zentrum für Luft- und Raumfahrt (DLR), Laboratoire de Planétologie et Géodynamique [UMR 6112] (LPG), Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), National and Kapodistrian University of Athens (NKUA), and Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, United States

Subjects
Planetengeologie, Cassini Titan, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], [PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience; We present a study focused on the mid-latitude and close to the equator surface regions on Titan that present an interest on their spectral behavior and/or morphology. These are regions where spectroscopic anomalies have been reported in the evolution of the brightness and several interpretations have been proposed (cryovolcanic candidates, evaporates, lacustrine, etc [1;2;5]). Also in our work here we have included analysis of some undifferentiated plains (also referred to as 'blandlands'), which are vast expanses of terrains that appear bland in the radar data [3]. By applying a Radiative transfer code [4;2] we have analyzed these regions to look for evolution with time through their spectral behavior. We use as reference point and calibration tool the surface albedo retrieval of the Huygens Landing site (Titan's ground truth) and we also check the variability of the surface albedo of these regions against areas that are not expected to change with time (e.g. dune fields), by retrieving their albedo differences at all wavelengths [2]. We report here surface albedo changes with time for some of these regions of interest that imply connection to exogenic and/or endogenic processes.

Published
2014

15. Is the Coriolis force responsible for curved features on Vesta?

Author

Otto, Katharina A., Jaumann, Ralf, Krohn, Katrin, Matz, Klaus-Dieter, Preusker, Frank, Roatsch, Thomas, Scholten, Frank, Schenk, Paul, Stephan, Katrin, Raymond, Carol A., and Russell, Christopher T.

Subjects
Planetengeologie, Massenbewegungen, Vesta, Rheasilvia, Korioliseffekt, Dawn
Published
2013

17. Spectral properties of fluvial terrain on Titan: An update

Author

Langhans, Mirjam, Jaumann, Ralf, Stephan, Katrin, Brown, Robert H., Buratti, Bonnie J., Clark, Roger, Baines, Kevin H., Nicholson, Phil D., and Lorenz, Ralph D.

Subjects
Planetengeologie, VIMS, Spectra, Titan, Methane, Valleys
Published
2010

18. Valley formation from methane convective storms on Titan

Author

Langhans, Mirjam, Jaumann, Ralf, Stephan, Katrin, Brown, Robert H., Buratti, Bonnie J., Clark, Roger, Baines, Kevin H., Nicholson, Phil D., Lorenz, Ralph D., and Sotin, Christophe

Subjects
Planetengeologie, Titan, Methane, Valleys
Published
2010

19. Specular reflection on Titan: Liquids in Kraken Mare

Author

Stephan, Katrin, Jaumann, Ralf, Brown, Robert H., Soderblom, Jason M., Soderblom, Laurence A., Barnes, Jason W., Sotin, Christophe, Griffith, Caitlin A., Kirk, Randolph L., Baines, Kevin H., Buratti, Bonnie J., Clark, Roger N., Lytle, Dyer M., Nelson, Robert M., and Nicholson, Phillip D.

Subjects
VIMS, Cassini, Liquids, Titan, Kraken Mare
Published
2010

20. Candidate imaging target areas of Ganymede and Callisto for geologic investigations and crater size-frequency measurements in a future mission to Jupiter and its satellites

Author

Wagner, Roland, Stephan, Katrin, Hussmann, Hauke, Roatsch, Thomas, Jaumann, Ralf, Neukum, Gerhard, Schmedemann, Nico, and Wolf, Ursula

Subjects
Planetengeologie, geology, crater, Jupiter, Ganymede, Callisto, cryovolcanism, impact, erosion, tectonism, degradation
Abstract

NASA and ESA are currently planning a joint mission to Jupiter and its satellites termed EJSM (Europa Jupiter System Mission). Potential imaging target areas on the two largest satellites Ganymede and Callisto are selected and suggested by geologic topics, such as: (1) impact crater forms, (2) erosion and degradation features, (3) tectonic forms, (4) cryovolcanic features, and (5) impact crater size-frequency distributions.

Published
2009

21. Zusammenhänge mit geologischen Strukturen und deren Gestaltungsprozessen

Author

Stephan, Katrin

Subjects
523.45, Jupitermonde {Astronomie}, TGG 605
Abstract

Die Untersuchung der Oberflächenzusammensetzung von Ganymed basiert auf Daten des abbildenden Spektrometers NIMS an Bord der Raumsonde Galileo, das die Ganymedoberfläche im Spektralbereich des Nahen Infrarot detektiert. Die Verarbeitung der vorliegenden Spektraldaten einschließlich der quantitativen Analyse der spektralen Signaturen in den Reflexionsspektren von Ganymed wie deren Charakterisierung in Abhängigkeit der geologischen Oberflächenstrukturen bildet den zentralen Teil der Arbeit. Die Ergebnisse zeigen, dass Veränderungen der Reflexionseigenschaften der Ganymedoberfläche auf den wechselnden Anteil von Wassereis und Gesteinsmaterial und dem Gehalt an CO2 zurückzuführen sind. Die simultane Analyse der Absorptionen von Wassereis erlaubt es ferner, erstmals Veränderungen des relativen Anteils und der Partikelgröße von Wassereis getrennt voneinander zu erfassen..., thesis

Published
2006

23. Analyse von feinkörnigem dunklem Material innerhalb von Kratern auf dem Mars mittels HRSC- und OMEGA-Daten

Author

Tirsch, Daniela, Stephan, Katrin, Jaumann, Ralf, and Neukum, Gerhard

Subjects
HRSC, Planetengeologie, OMEGA, Dünen, Mars, dunkles Material
Abstract

Die High Resolution Stereo Kamera (HRSC) und das OMEGA-Spektrometer an Bord des Mars Express Orbiters liefern hochauflösende Bilddaten der Marsoberfläche und ermöglichen zudem eine Analyse der mineralogischen Eigenschaften der beobachteten Oberflächen. Bei deren Betrachtung findet man weit verbreitet ein feinkörniges, dunkles, äolisch transportiertes Material, das auf Kraterböden häufig in Form von Dünen abgelagert wurde. In diesem Beitrag werden global ausgewählte Krater vorgestellt. Anhand einer Kartierung der Krater konnte gezeigt werden, dass die Lage der Dünen innerhalb der Krater im Zusammenhang mit der Windrichtung steht. Das dunkle Material ist in einigen Fällen als mechanisches Verwitterungsprodukt von in den Katerwänden anstehendem Gestein identifizierbar. Durch den hohen Anteil an mafischen Mineralen (Pyroxen und Olivin), scheint das Material wenig oder keine chemische Verwitterung erfahren zu haben.

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