JpGU-AGU Joint Meeting 2026

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[E] Oral

P (Space and Planetary Sciences ) » P-PS Planetary Sciences

[P-PS08] Science of Venus in the post-VEx/Akatsuki era

Fri. May 29, 2026 1:45 PM - 3:15 PM 303 (International Conference Hall, Makuhari Messe)

Chairperson:Harada Yuki(ISEE, Nagoya University), Tellmann Silvia(University of Cologne)

On 18 September 2025, the Akatsuki team transmitted the "termination of telecommunication" command to the spacecraft, thereby officially ending the operation of Akatsuki which has been and still is in the Venus' orbit since December 2015. ESA's Venus Express (in orbit from April 2006 till December 2014) and Akatsuki together had greatly advanced our knowledge about the Venusian atmosphere, with the focus of VEx being primarily chemistry and Akatsuki's focus being almost exclusively dynamics. The planetary science community in the world gained a strong momentum to further investigate Earth's twin sister: Two of the upcoming three Venus missions, NASA's VERITAS and ESA's EnVision, are more focused on the geology, interior and evolution of the solid body with the synthetic aperture radar and other tools. Another NASA mission DAVINCI will sense both the atmosphere and the surface by a descent probe. Other recent developments include the approval of the Venus Orbiter Mission (VOM) by the Indian government; the upgrade of Chinese VOICE mission to a Venus sample return mission, and announcement of the first private sector Venus mission, Venus Life Finder.
This momentum is driven by the analytical studies based on all previous Venus missions, numerical simulations (recently with data assimilation), ground-based observations, as well as laboratory experiments. This session will therefore cover all aspects of Venus science, derived observationally or theoretically, from its interior over the surface and atmosphere to the surrounding plasma environment and including possible implications for exoplanets. Contributions at all levels, from early-career researchers to experts, are all welcome.

1:45 PM - 2:05 PM

[PPS08-01] Constraining Venus’ Water Loss History Using D/H Ratio observations from Ion Cyclotron Wave Analysis

★Invited Papers

*Fabian Weichbold1,2, Helmut Lammer1, Manuel Scherf1, Daniel Schmid1, Cyril Simon-Wedlund2, Christian Mazelle3, Tereza Constantinou4, Martin Volwerk1, Woitke Peter1 (1. Space Research Institute (IWF), Austrian Academy of Sciences (OeAW), Austria , 2. Institute of Physics, University of Graz, Universitätsplatz 5, 8010 Graz, Austria , 3. Institut de Recherche en Astrophysique et Planétologie, CNRS, University of Toulouse, CNES, Toulouse, France , 4. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK)

2:20 PM - 2:40 PM

[PPS08-03] Elucidating the role of Polysulfur Allotropes in the Venusian Atmosphere: (Photo)chemistry and Cloud condensation.

★Invited Papers

*Benjamin Normann Frandsen1, Robert Skog1, Maxence Lefévre2, Franck Lefévre2, Anni Määttänen2, Aurélien Stolzenbach3, Ashwin Braude4 (1. University of Helsinki, Faculty of Science, Department of Chemistry, Molecular Science Unit, Finland, 2. LATMOS/IPSL, Sorbonne Université, UVSQ, Université Paris-Saclay, CNRS, Paris, France, 3. Instituto de Astrofísica de Andalucía (IAA), Granada, Spain, 4. Astera Institute, Emeryville, CA, USA)

2:40 PM - 2:55 PM

[PPS08-04] Multi-Spatiotemporal Variations of the Venusian Cloud-Top Sulfur Dioxide Derived from Akatsuki/UVI Observations

*Tatsuro Iwanaka1, Takeshi Imamura2, Shohei Aoki2,3, Marcq Emmanuel4, Hideo Sagawa5 (1. RIKEN Center for Computational Science , 2. Graduate School of Frontier Sciences, the University of Tokyo, 3. Graduate School of Science, Tohoku University, 4. LATMOS/IPSL, UVSQ Université Paris-Saclay, 5. Faculty of Science, Kyoto Sangyo University)

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