Therefore, for bodies made mainly of rock, the minimum size to become a self-gravitating sphere is about 600km diameter.
As you can see in the one scan, the moon is round so the moon is at least 600 km in diameter. The planet is shown to have three times the diameter of the moon. So the planet is at least 1800 km in diameter. So you can't say it's any smaller. That's the super low ball but it's not some tiny asteroid.