It equally orbits the sun and the earth. Normally, objects with smaller orbits take less time to make a circuit. But this is placed where the earth's gravity p

It equally orbits the sun and the earth. Normally, objects with smaller orbits take less time to make a circuit. But this is placed where the earth's gravity pulls it back, just enough to make it take one (earth) year to finish its smaller orbit. So gravity from the earth and the sun are involved.