According to NASA, an asteroid is labelled "potentially hazardous" based on a combination of factors: its size and how close its orbit comes to Earth. Asteroids measuring 492 feet or beyond approaching the planet within 4.

Scientists are tracking an object heading toward earth that could enter the planet’s orbit, and they are not entirely sure what it is. The object, named Asteroid 2020 SO, is believed to be man made and not a piece of moon or other planetary debris.