Parameters of the Apophis close encounter with Earth on April 13, 2029. The top panel shows the geocentric (solid line) and selenocentric (dashed line) distance, and the bottom panel shows the relative geocentric and selenocentric velocity. The origin of the abscissa is at the nominal Earth closest approach epoch 62239.90709 (MJD). The horizontal dashed line at the top panel indicates the closest approach distance of 38 012 km, the horizontal dashed lines at the bottom panel show the relative geocentric velocities at the closest approach, 7.42 km s⁻¹, and the asymptotic value, 5.84 km s⁻¹. The closest approach to the Moon is at 95 959 km. The black arrow shows the Apophis P_ϕ timescale for reference.