The first thought looking at the picture -- it could be interstellar probe created by some alien race. Rotation and metal body -- something to think about. This reminds me "The Dark Forest Theory" described in the fantastic trilogy "The Three-Body Problem" by Cixin Liu [1] -- Chinese Isaac Asimov. Really great read in case you didn't read it yet.

[1] https://www.amazon.com/Three-Body-Problem-Cixin-Liu/dp/07653...

Had never heard of it, but it looks really interesting:

https://www.amazon.com/Three-Body-Problem-Cixin-Liu/dp/07653...