As for the title. Although the scenic Blue Moon Jupiter Saturn combo of last week end wasn't really suitable for shooting with a G-cam in Astrophotography mode, I've nevertheless tried to see if I could have got more stars.
Just after the shooting I was astonished to see that even Jupiter lead to a reflection on the sea surface (no boats or lights were there!).
Later, a friend suggested that the reflection is an up side down ghost of the Moon's one. It seems so, as many features correspond, and one can see a cross shape formed by the little waves breaking on the shore.
I think that experienced photographers here can easily confirm this hypothesis or convertely push back to the astonishing Jupiter reflection (the astrophotography mode of G-cams is, among other things, a kind of long exposure).