I believe it came a close as 0.16 AU (tracing the path backward), which is 66 times further than the moon. Being an interstellar object though, it moves faster

I believe it came a close as 0.16 AU (tracing the path backward), which is 66 times further than the moon. Being an interstellar object though, it moves faster than the escape velocity to the sun, so it would pack a higher energy per unit of mass than a regular comet or asteroid. Fortunately such objects are also somewhat rare.