surface. If the kinetic energy delivered to its surface is high enough, reshaping may also occur in Didymos, given its near-rotational-breakup spin rate. Reshaping on either body will modify their mutual gravitational field, leading to a reshaping-induced orbital period change, in addition to the impact-induced orbital period change. If left unaccounted for, this could lead to an erroneous interpretation of the effect of the kinetic deflection technique. Observations of the impact DART's companion LICIACube, the Hubble and James Webb space telescopes, and the Earth-based ATLAS observatory all detected the ejecta plume from the DART impact. On September 26, SOAR observed the visible impact trail to be over 10,000 km long. Initial estimates of the change in binary orbit period were expected within a week and with the data released by LICIACube. DART's mission science depends on careful Earth-based monitoring of the orbit of Dimorphos over the subsequent days and months. Dimorphos was too small and too close to Didymos for almost any observer to see directly, but its orbital geometry is such that it transits Didymos once each orbit and then passes behind it half an orbit later. Any observer that can detect the Didymos system therefore sees the system dim and brighten again as the two bodies cross. The impact was planned for a moment when the distance between Didymos and Earth is at a minimum, permitting many telescopes to make observations from many locations. The asteroid will be near opposition and visible high in the night sky into 2023. The change in Dimorphos's orbit around Didymos was detected by optical telescopes watching mutual eclipses of the two bodies through photometry on the Dimorphos-Didymos pair. In addition to radar observations, they confirmed that the impact shortened Dimorphos' orbital period by 32 minutes. Follow-up mission In a collaborating project, the European Space Agency is developing Hera, a spacecraft that will be launched to Didymos in 2024 and arrive in 2026. (5 years after DART's impact), to do a detailed reconnaissance and assessment. Hera would carry two CubeSats, Milani and Juventas. AIDA mission architecture Mission profile Target asteroid The mission's target was Dimorphos in 65803 Didymos system, a binary asteroid system in which one asteroid is orbited by a smaller one. The primary asteroid (Didymos A) is about in diameter; the asteroid moon Dimorphos (Didymos B) is about in diameter in an orbit about from the primary. The mass of the