Articles | Volume 44, issue 2
https://doi.org/10.5194/angeo-44-1075-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-44-1075-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Regular paper
| 
14 Oct 2026
Regular paper |
| 14 Oct 2026
| 14 Oct 2026
In-flight receiver calibration of the Ganymede Laser Altimeter (GALA) by passive Earth observations
Institute of Space Research, German Aerospace Center (DLR), Rutherfordstraße 2, 12489 Berlin, Germany
Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
Department of Cosmosciences, Hokkaido University, Kita-10 Nishi-8, Kita-ku, Sapporo, 060-0810, Japan
Alexander Stark
Institute of Space Research, German Aerospace Center (DLR), Rutherfordstraße 2, 12489 Berlin, Germany
Klaus-Dieter Matz
Institute of Space Research, German Aerospace Center (DLR), Rutherfordstraße 2, 12489 Berlin, Germany
Christian Hüttig
Institute of Space Research, German Aerospace Center (DLR), Rutherfordstraße 2, 12489 Berlin, Germany
Kai Wickhusen
Institute of Space Research, German Aerospace Center (DLR), Rutherfordstraße 2, 12489 Berlin, Germany
Livio Agostini
INAF-IAPS (Istituto di Astrofisica e Planetologia Spaziali), Via Fosso del Cavaliere 100, 00133 Rome, Italy
Christian Althaus
Institute of Space Research, German Aerospace Center (DLR), Rutherfordstraße 2, 12489 Berlin, Germany
Jan Binger
Institute of Space Research, German Aerospace Center (DLR), Rutherfordstraße 2, 12489 Berlin, Germany
Keigo Enya
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan
The Graduate University for Advanced Studies, SOKENDAI, Hayama, Miura-gun, Kanagawa 240-0193, Japan
Janot George
Institute of Space Research, German Aerospace Center (DLR), Rutherfordstraße 2, 12489 Berlin, Germany
Kay Lingenauber
Institute of Space Research, German Aerospace Center (DLR), Rutherfordstraße 2, 12489 Berlin, Germany
Jun Kimura
Department of Earth and Space Science, The University of Osaka, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
Masanori Kobayashi
Planetary Exploration Research Center, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
Giulio Macrì
Dipartimento di Fisica e Astronomia “Galileo Galilei”, Università di Padova, Vicolo dell’Osservatorio 3, 35122 Padova, Italy
Institute of Space Research, German Aerospace Center (DLR), Rutherfordstraße 2, 12489 Berlin, Germany
Wladimir Neumann
Institute of Space Research, German Aerospace Center (DLR), Rutherfordstraße 2, 12489 Berlin, Germany
Institute of Geodesy and Geoinformation Science, Technische Universität Berlin, Kaiserin-Augusta-Allee 104-106, 10553 Berlin, Germany
Luca Penasa
INAF-OAPd (Osservatorio Astronomico di Padova), Vicolo Osservatorio 5, 35122 Padova, Italy
Ganna Portyankina
Institute of Space Research, German Aerospace Center (DLR), Rutherfordstraße 2, 12489 Berlin, Germany
Cecilia Tubiana
INAF-IAPS (Istituto di Astrofisica e Planetologia Spaziali), Via Fosso del Cavaliere 100, 00133 Rome, Italy
Konrad Willner
Institute of Space Research, German Aerospace Center (DLR), Rutherfordstraße 2, 12489 Berlin, Germany
Pasquale Palumbo
INAF-IAPS (Istituto di Astrofisica e Planetologia Spaziali), Via Fosso del Cavaliere 100, 00133 Rome, Italy
Hauke Hussmann
Institute of Space Research, German Aerospace Center (DLR), Rutherfordstraße 2, 12489 Berlin, Germany
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Latest update: 16 Oct 2026
Short summary
In-flight calibration of the Ganymede Laser Altimeter (GALA) aboard Juice mission is important for measuring topography and tidal deformation of icy moons as well as surface reflectance. Using passive Earth observations, this study establishes a framework for receiver calibration in comparison with images. As a result, we report that GALA may have experienced a post-launch boresight offset over 700 μrad, together with the radiometric calibration for future reflectance measurements by GALA.
In-flight calibration of the Ganymede Laser Altimeter (GALA) aboard Juice mission is important...
