The larger asteroid had a diameter of at least 165 metres while the smaller moon-like asteroid was around 70 metres in diameter.
The asteroid is so massive, that if a collision were to occur, the impact would kill off millions of human inhabitants and lead to a mass extinction of animals, and possibly a global nuclear winter that could last for years.
"Potentially hazardous" NEOs are defined as space objects that come within 0.05 astronomical units and measure more than 460 feet in diameter, according to NASA. Given how fast it is going, PZ39 will be approaching Earth on Saturday, the 15th of February. Asteroids this small, if in case it should collide with Earth, would most likely burn up upon contact with the atmosphere.
Because the asteroids' paths often cross our planet's orbit, there is a slim chance they might strike in the future.
A "potentially hazardous" asteroid that is larger than the tallest structure on earth and powerful enough to cause mass extinction is reportedly speeding toward Earth at an estimated 34,000 miles per hour. NASA tracked down an asteroid that could potentially bring disastrous effects on the planet if it collided.
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Asteroid PZ39 is potentially hazardous because it is a near-Earth object (NEO) that is big enough and close enough to raise the alarm bells. Because of its minimum orbit intersection distance (MOID) and size, it was considered as a potentially hazardous asteroid (PHA). CNEOS has identified 2002 PZ39 as an Apollo asteroid.
Currently, there is no known asteroid that is headed directly for Earth and that includes Asteroid PZ39. During its close approach, the asteroid will be nearly 3.58 million miles away from the earth.
A binary asteroid is a two-asteroid system that has one common center.
It will pass Mars in June but won't be back past Earth until 2022 - by then it will be even further way - it's next close approach won't be until after 2100.