EGUsphere EGUsphere EGUsphere EGUsphere Copernicus Publications Göttingen, Germany 10.5194/egusphere-2026-2032 Calibrating JANUS: an overview of the calibration pipeline and what we learned from the Moon-Earth flyby data Agostini Livio https://orcid.org/0000-0001-7293-5823 1 Matz Klaus-Dieter 2 Tubiana Cecilia https://orcid.org/0000-0001-8475-9898 1 Della Corte Vincenzo https://orcid.org/0000-0001-6461-5803 3 Penasa Luca https://orcid.org/0000-0002-6394-3108 4 Bilotta Thomas 5 Sarti Francesco 5 Read Matthew 6 Hviid Stubbe 2 Mottola Stefano https://orcid.org/0000-0002-0457-3872 2 Aboudan Alessio 7 Trauthan Frank 2 Politi Romolo 6 Aye Michael https://orcid.org/0000-0002-4088-1928 8 Hueso Ricardo https://orcid.org/0000-0003-0169-123X 9 Lucchetti Alice https://orcid.org/0000-0001-7413-3058 6 Kersten Elke https://orcid.org/0000-0002-3818-5165 2 Belgacem Ines https://orcid.org/0000-0001-8427-4997 10 Dietz Angela 11 Evill Ry 11 Bell III Jim F. 12 Zinzi Angelo 13 Castro-Marin Jose María https://orcid.org/0000-0002-9658-8421 14 Roatsch Thomas 2 Schmitz Nicole 2 Patel Manish R. https://orcid.org/0000-0002-8223-3566 6 Lara Luisa M. https://orcid.org/0000-0002-7184-920X 14 Portyankina Ganna https://orcid.org/0000-0002-1323-8195 2 Palumbo Pasquale https://orcid.org/0000-0003-2323-9228 1 INAF - IAPS (Istituto di Astrofisica e Planetologia Spaziali), Via Fosso del Cavaliere 100, 00133, Rome, Italy German Aerospace Center (DLR), Institute of Space Research, Rutherfordstr. 2, 12489 Berlin, Germany INAF - OACN (Osservatorio Astronomico di Capodimonte), Salita Moiariello 16, 80131, Napoli, Italy INAF - OAPd (Osservatorio Astronomico di Padova), Vicolo Osservatorio 5, 35122, Padova, Italy Leonardo SpA, Via delle Officine Galileo 1, 50013, Campi Bisenzio (FI), Italy School of Physical Sciences, The Open University, Milton Keynes, MK7 6AA, UK Università di Padova - CISAS Giuseppe Colombo, via Venezia 15, 35131 Padova, Italy Freie Universität Berlin, Inst.for Geosciences, Malteserstr. 74-100, 12249 Berlin, Germany Escuela de Ingeniería de Bilbao, Universidad del País Vasco, UPV/EHU, Plaza Ingeniero Torres Quevedo 1, 48013 Bilbao, Spain European Space Agency (ESA), European Space Astronomy Centre (ESAC), Villanueva de la Cañada, Madrid, Spain European Space Agency (ESA), European Space Operation Center, Darmstadt, Germany Arizona State University, School of Earth and Space Exploration, Box 876004, Tempe, AZ, 85287, USA ASI (Agenzia Spaziale Italiana) - Centro Spaziale di Matera, C.da Terlecchia, 75100, Matera, Italy IAA-CSIC (Instituto de Astrofísica de Andalucía - CSIC), Glorieta de la Astronomía 3, 18008 Granada, Spain 14 04 2026 2026 1 36 Copyright: © 2026 Livio Agostini et al. 2026 This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/ This article is available from https://egusphere.copernicus.org/preprints/2026/egusphere-2026-2032/ The full text article is available as a PDF file from https://egusphere.copernicus.org/preprints/2026/egusphere-2026-2032/egusphere-2026-2032.pdf

JANUS (Jovis Amorum Ac Natorum Undique Scrutator) is the high-resolution multispectral camera on board of the ESA Jupiter Icy Moons Explorer (JUICE). The mission, launched in April 2023, is currently traveling towards the Jovian system where it will characterize Jupiter, its environment and its icy moons, primarily Ganymede. During 19–20 August 2024 JUICE flew by the Moon and the Earth performing a Lunar-Earth Gravity Assist maneuver (LEGA) that provided a unique opportunity to test the instruments in mission-like conditions. In this paper we describe the status of the calibration pipeline applied to JANUS data acquired during LEGA, the lessons learned by the analysis of the calibrated data and the open points.