This image of Jupiter was taken at the maximum zoom that this camera could go to. There was a black dot infront of the Jupiter. Certainly i think this was not a shadow of the galileon moons as the sun was behind Jupiter and the galileon moons were on the right of Jupiter. Sensing that my camera lens may have some dirt, i shifted it to take other objects but there was no dot anywhere to be seen. When i took the Jupiter again, i realised the dot was still there. Could it be the conjunction of Pluto and Jupiter? I read from many sources that Pluto and Jupiter will be in conjunction. See this

https://earthsky.org/astronomy-essentials/how-to-see-pluto-in-the-night-sky

So can anyone help to explain what is this black dot infront of Jupiter as seen from Earth? I am puzzled !

https://earthsky.org/astronomy-essentials/how-to-see-pluto-in-the-night-sky