Surprise! I found a one-off manga by Kazuhisa Kondo. It was released in 1992 and is one of the first manga in the UC continuity that happened outside of the Earth Sphere. It features Axis units led by two famous Zeon aces against a Gundam unit piloted by a mysterious figure near Jupiter...
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Reference:
https://en.wikipedia.org/wiki/Kazuhisa_Kondo (English version)
https://ja.wikipedia.org/wiki/近藤和久 (Japanese version)
https://gundam.fandom.com/wiki/Jupiter_(Zeus)_in_Operation_Titan_U.C._0083