Astronomers studying observations taken by NASA’s Wide-field Infrared Survey Explorer (WISE) mission have discovered the first in a long-sought type of asteroid companion to Earth, known “Trojan”, orbiting the sun along with Earth.Trojans are asteroids that share an orbit with a planet near stable points in front of or behind the planet. They are a hypothetical group of asteroids moving around the sun in Earth’s orbit at 60 ° ahead (L4) or behind (L5) it being in one of the two Lagrange points. The asteroid, called 2010 TK7, is nearly 1,000 feet (300 meters) in diameter across and currently leading the Earth by about 50 million miles (80 million kilometers).
The researchers have calculated the asteroid’s orbit well enough to understand where it will be over the next 10,000 years and so 2010 TK7 will not approach Earth any closer than 12.4 million miles (20 million kilometers), which is more than 50 times the distance from Earth to the moon. Have to say that 2010 TK7 doesn’t have a formal name and also no color information about 2010 TK7 to shed light on its composition. Asteroid 2010 TK7 may be the first confirmed Earth Trojan asteroid, but there are several space rocks known to exist in relatively stable orbits in our planet’s neighborhoods.