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Science Objectives of the Ganymede Laser Altimeter (GALA) for the JUICE Mission

Kimura, Jun and Hussmann, Hauke and Kamata, Shunichi and Matsumoto, Koji and Oberst, Jürgen and Steinbrügge, Gregor and Stark, Alexander and Gwinner, Klaus and Oshigami, Shoko and Namiki, Noriyuki and Lingenauber, Kay and Enya, Keigo and Kuramoto, Kiyoshi and Sasaki, Sho (2019) Science Objectives of the Ganymede Laser Altimeter (GALA) for the JUICE Mission. In: TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 17 (2), pp. 234-243. International Symposium on Space Technology and Science, 03.-09. Jun. 2017, Matsuyama, Japan. DOI: 10.2322/tastj.17.234

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Official URL: https://www.jstage.jst.go.jp/article/tastj/17/2/17_17.234/_article


Abstract Laser altimetry is a powerful tool for addressing the major objectives of planetary physics and geodesy. Through measurements of distances between a spacecraft and the surface of the planetary bodies, it can be used to determine the global shape and radius: global, regional, and local topography: tidal deformation: and rotational states including physical librations. Laser altimeters have been applied in planetary explorations of the Moon, Mars, Mercury, and the asteroids Eros, and Itokawa. The JUpiter Icy Moons Explorer (JUICE), led by European Space Agency (ESA), has started development to explore the emergence of habitable worlds around gas giants. The Ganymede Laser Altimeter (GALA) will be the first laser altimeter for icy bodies, and will measure the shape and topography of the large icy moons of Jupiter, (globally for Ganymede, and using flyby ground-tracks for Europa and Callisto). Such information is crucial for understanding the formation of surface features and can tremendously improve our understanding of the icy tectonics. In addition, the GALA will infer the presence or absence of a subsurface ocean by measuring the tidal and rotational responses. Furthermore, it also improves the accuracy of gravity field measurements reflecting the interior structure, collaborating with the radio science experiment. In addition to range measurements, the signal strength and the waveform of the laser pulses reflected from the moon's surface contain information about surface reflectance at the laser wavelength and small scale roughness. Therefore we can infer the degrees of chemical and physical alterations, e.g., erosion, space weathering, compaction and deposition of exogenous materials, through GALA measurements without being affected by illumination conditions. JUICE spacecraft carries ten science payloads including GALA. They work closely together in a synergistic way with GALA being one of the key instruments for understanding the evolution of the icy satellites Ganymede, Europa, and Callisto.

Item URL in elib:https://elib.dlr.de/132319/
Document Type:Conference or Workshop Item (Other)
Title:Science Objectives of the Ganymede Laser Altimeter (GALA) for the JUICE Mission
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kimura, JunOsaka University, JapanUNSPECIFIED
Hussmann, Haukehauke.Hussmann (at) dlr.deUNSPECIFIED
Kamata, ShunichiCreative Research Institution, Hokkaido University, JapanUNSPECIFIED
Matsumoto, KojiNational Astronomical Observatory of JapanUNSPECIFIED
Oberst, JürgenJuergen.Oberst (at) dlr.deUNSPECIFIED
Steinbrügge, Gregorgregor.steinbruegge (at) dlr.deUNSPECIFIED
Stark, Alexanderalexander.stark (at) dlr.dehttps://orcid.org/0000-0001-9110-1138
Gwinner, KlausKlaus.Gwinner (at) dlr.deUNSPECIFIED
Oshigami, ShokoNational Astronomical Observatory of JapanUNSPECIFIED
Namiki, NoriyukiNational Astronomical Observatory of JapanUNSPECIFIED
Lingenauber, Kaykay.lingenauber (at) dlr.deUNSPECIFIED
Kuramoto, KiyoshiHokkaido UniversityUNSPECIFIED
Sasaki, ShoOsaka University, JapanUNSPECIFIED
Date:31 January 2019
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.2322/tastj.17.234
Page Range:pp. 234-243
Keywords:Laser Altimetry, Ganymede, GALA, JUICE
Event Title:International Symposium on Space Technology and Science
Event Location:Matsuyama, Japan
Event Type:international Conference
Event Dates:03.-09. Jun. 2017
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):Project JUICE JANUS and GALA
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Institute of Planetary Research > Planetary Sensor Systems
Deposited By: Stark, Alexander
Deposited On:09 Dec 2019 11:35
Last Modified:09 Dec 2019 11:35

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