Occultation by the Jovian satellite Ganymede on the 14th of October 2025

In the morning of October 14th 2025 the Jovian satellite Ganymede will occult a 7th mag star for large parts of Europe. Ganymede is the main goal of the European Juice mission. After a few years’ tour around Jupiter (2031-2034), it will ultimately orbit around Ganymede (starting on December 2034) making a large number of measurements including radar sounding, altimetry, imaging and radio-science measurements.

Many information about the event can be found in our JOA Journal following page 3

A special meeting before the event is hold on 4th of October 2025 14h30 - 17h00

Agenda:

Valery Lainey : The stellar occultation of Oct. 14th: a unique opportunity to test the European ephemerides of the Jovian system before the arrival of Juice.

Josselin Desmars : Maps and data related to the forecasted event

Thierry Midavaine : The ability to measure the diameter and the shape of the cross section of an occulted star

Arnaud Leroy : Setup configuration 10 days to be ready, preliminary test on the targets

Tune the latency of each amateur setup for the European wide occultation chaser community.

Q&A

Session Question Réponse en français

Website of the campaign

Website of the campaign

The Zoom link to take part of the online meeting