Deployable Optics for Future Space Observatories

Abstract

Nomenclature JWST = James Webb Space Telescope RSF = Robotic space flight TPF = Terrestrial Planet Finder PMS = Probability of mission success ELV = Expendable launch vehicle Si = Cost savings for the ith item Mechanisms = Joints providing deployment capability Ci = Cost increase for the ith item HARD = High Accuracy Reflector Development ORU = orbital replacement unit RTJ = Rotational translational joint Pi = Conditional probability of success for the ith term PSI = Pounds per square inch Ni = Number of interfaces in a system RF = Radio frequency Ns = Number of segments in a primary mirror CTE = Coefficient of thermal expansion D = Aperture of the primary mirror, or objective OTA = Optical telescope assembly d = Maximum clear aperture of a mirror segment OHP = Octagonal hub pancake EVA = extravehicular activity HSF = Human space flight PLOC = Probable loss of crew (injury or fatality of one or more members) LEO = Low Earth orbit CG = Center of gravity