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Table 1

Apophis’ orbital parameters, comparison with the Earth’s.

Parameter Earth Apophis

e: eccentricity 0.0167 0.191
a: semi major axis 1 au 0.922 au
i: inclination
q = a(1 − e): distance to perihelion 0.98 au 0.746 au
Q = a(1 + e): distance to aphelion 1.02 au 1.099 au

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