That sort of event would typically be getting a slingshot[1] boost from a large passing mass. Those wouldn't come anywhere near breaking a normal asteroid but

That sort of event would typically be getting a slingshot[1] boost from a large passing mass. Those wouldn't come anywhere near breaking a normal asteroid but who knows with a fluffy one. [1]https://en.wikipedia.org/wiki/Gravity_assist https://en.wikipedia.org/wiki/Gravity_assist