But for the scientists, we would never have known about an asteroid that was leading the Earth around the Sun. Only detected around Jupiter, Neptune and Mars, the asteroid which is named as Trojan 2010 TK7 measures only about 300 yards across, making the Earth the fourth planet in the solar system. Being a helping hand to the Earth along with Moon on the year long journey, the discovery has brought new ideas for the scientists by making them assume that more of asteroids are yet to be found.
As it is never going to get closer than 50-times, exactly the same distance as the moon sits from us, they are very hard to find from the Earth because they are not too big and pretty faint. But they are identifiable from space and if one wants to identify its path, one should consider Earth and the asteroid in a traveling position around a clock face with the Sun in the middle.
Also revealing that there will be more of them which is close to the Earth which can be potential targets to go to with spacecraft in the future. Also check the video