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More than likely, Jupiter showing 3 moons and maybe a star in the background. The moons lie on an approximate plane around the planets equator. The spot not lying on this plane is possibly a star.
The 4th moon, the closest, Io, is is more than likely in front or behind the planet.
You should be able to make out the equatorial bands around the centre of the planet.
If you look at Jupiter another night the moons will have moved.
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