THE HARDEST PLANET TO DISCOVER

THE HARDEST PLANET TO DISCOVER should be the one which shares the earth’s orbit, following Earth by exactly six months. Look for it with a telescope and, well, there would be the Sun in the way. So far we do not know if it is there.

BUT WE KNOW NOW THAT WE DO SHARE OUR ORBIT. We follow a lump of rock, just as Pacman pursues a pill or a pellet. The rock is 300m across, which makes it an asteroid; it would need to be under 50m to be a meteoroid. Its name is 2010 TK7

IT IS AT LAGRANGE POINT L4

Its orbit is very wobbly, because it is at lagrange point L4. But this makes it easier to find. Lagrange points are locations where the gravity from two neighbouring objects is equal, enabling objects to fall to them, or in and out of them for a wobble. Not only do asteroids fall into planets or moons, they fall into places such as L4.   

See http://en.wikipedia.org/wiki/List_of_objects_at_Lagrangian_points

This drawing shows the 5 lagrange points for
Sun (yellow) - Earth(blue)

THE QUESTION REMAINS

Is there anything PARKED AT L3 ? ? ?