  On 26 September 2022 the Double Asteroid Redirection Test (DART) spacecraft
impacted Dimorphos, a satellite of the asteroid 65803 Didymos. Because it is a
binary system, it is possible to determine how much the orbit of the satellite
changed, as part of a test of what is necessary to deflect an asteroid that
might threaten Earth with an impact. In nominal cases, pre-impact predictions
of the orbital period reduction ranged from ~8.8 - 17.2 minutes. Here we report
optical observations of Dimorphos before, during and after the impact, from a
network of citizen science telescopes across the world. We find a maximum
brightening of 2.29 $\pm$ 0.14 mag upon impact. Didymos fades back to its
pre-impact brightness over the course of 23.7 $\pm$ 0.7 days. We estimate lower
limits on the mass contained in the ejecta, which was 0.3 - 0.5% Dimorphos'
mass depending on the dust size. We also observe a reddening of the ejecta upon
impact.
