An analysis of the linear stability and control of families of displac
ed solar sail orbits is presented. Three families of orbits are review
ed along with their linear stability characteristics. It is then shown
that the unstable subfamilies of orbits that exist are controllable u
sing state feedback to the sail attitude. However, a more useful resul
t is presented that demonstrates that linear stability can be achieved
if the sail attitude is fixed relative to the sun-sail line. Such an
attitude can be achieved by passive means by a suitable choice of sail
shape. Therefore, the subfamilies of unstable orbits can in principle
be stabilized by fully passive means. Such passive control is clearly
useful for simplifying station-keeping on such orbits.