Contest entry: The flying "thing"

It was a year ago when I took some photos of the night sky with my phone. And then just for a second something appeared. It was flying towards and above me. At first I didn't understand what it is, thought it was some sort of a bug. And when I reviewed the pictures on my PC afterwards, it turned out some very strange object with a boomerang shape, instead of a bug. See for yourself...

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Image source: My phone

So I'm still wondering what could it be?

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This is my entry for @manoldonchev's photoanthill photography contest.

Thank you for your time!