Phil Plait's Bad Astronomy's Fly Me to the Moon and Then to a Near-Earth Asteroid describes Near Earth Asteroid Scout (NEA Scout, or just Scout) a 6U cubesat that will be deployed from Artemis somewhere in cis-lunar space, deploy a solar sail, then sail to a near Earth asteroid:
Don’t let the size fool you. It uses four telescoping aluminum rods that will extend to 6.8 meters long (the height of a two-story house), which will unfurl a solar sail made of a kind of fancy plastic (aluminized polyimide) that is extremely lightweight because it’s only a stunning 2.5 microns thick. For comparison, a typical human hair is 100 microns thick. So, wow.
Once deployed, the sail will use sunlight as propulsion. Although photons have no mass, they do have momentum, so when they hit the sail they give it a kick. This is why the sail is so thin but large (85 square meters) and the spacecraft small and lightweight; the lower the mass the higher the acceleration. Although the acceleration is incredibly low, it’s continuous. That adds up, so while you don’t move fast initially, you can build up quite the velocity over weeks and months.
The asteroid target is not set yet, because the launch date isn’t secure and everything in space moves. After launch it will be placed into orbit around the Sun (what’s called a heliocentric orbit). After that, Scout will use a cold gas thruster to position itself, unfurl the sail, and then away it goes.
The cubesat will have both a large solar sail and solar panels. It will also need an attitude determination and control system for transit and to implement it's asteroid acquisition, approach and observation sequences as it flies past it.
The solar sail structure will be low mass and therefore somewhat delicate, and also subject to excitation into oscillation modes that might be a problem during the observation phase.
Reaction wheels can gently and smoothly change attitude, but the will usually need some kind of momentum unloading scheme.
Question: How will NEA Scout control its attitude during deep space flight and keep its camera steady without causing any vibrations or damage to its 85 square meter solar sail?