Update on parametric cost models for space telescopes

Parametric cost models are used to plan missions, compare concepts and justify technology investments. This paper updates an ongoing effort to develop cost modes for space telescopes and summarizes how recent database changes have changed previously published preliminary results. While the models are evolving, the previously published findings are valid: telescope cost increases with aperture diameter; it costs less per square meter of collecting aperture to build a large telescope than a small telescope; lower areal density telescopes cost more than more massive telescopes.