ESA's Hera mission is bringing two CubeSats along. They'll be landing on Dimorphos

In about one year from now, the European Space Agency will launch its Hera mission. Its destination is the asteroid Didymos, and it'll be the second human spacecraft to visit the 390-meter chunk of rock. NASA's DART mission crashed a kinetic impactor into Didymos' tiny moonlet Dimorphos as a test of planetary defense.