Around what?

NASA discovered that there was a satellite rock orbiting the asteroid that passed close by Earth earlier this week.

NASA has discovered a tiny moon 70 meters (230 feet) in diameter circling the asteroid that passed very close to Earth earlier this week, a situation that occurs in just 16 percent of the cases of known asteroids.

The tiny moon is orbiting the asteroid, which itself is only 325 meters (about 1,060 feet) in diameter.

If this asteroid went close enough to the moon it could get trapped into orbit.

Then there would be a moon around a moon around the Moon.

Around Earth. Around the Sun. Around the Milky Way. Around the Universe.

Around what?