What is the smallest item for which gravity has been recorded or observed? By this, I mean the smallest object whose gravitational effect upon another object has been detected. (Many thanks to Daniel Griscom for that excellent verbiage.)
In other words, we have plenty of evidence that the planet Earth exhibits gravitational force due to its mass. We also have theories that state that all mass, regardless of size, results in gravitational force.
What is the smallest mass for which its gravity has been recorded or observed?
(By the way, I hoped this Physics SE question would contain the answer, but it wound up being about gravity at the center of planet Earth.)
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