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The asteroid’s movements are complicated, as it spends half of its time closer to the sun than Earth and passes it before our planet, and then spends the other half of its time even farther away from us, causing it to eventually fall behind. The orbit is slightly tilted, causing it to engage in a bobbing motion once a year. Over multiple decades, 2016 HO3 also does a slow, back-and-forth twist.
Earth’s gravitational pull prevents the mini-moon from ever getting too far away or too close, ultimately keeping us safe in this temporary relationship …. http://www.trueactivist.com