Scaling An External Occulter Coronagraph Mission

Details Scaling An External Occulter Coronagraph Mission Scaling An External Occulter Coronagraph Mission

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21340403n&link_type=abstract

American Astronomical Society, AAS Meeting #213, #404.03; Bulletin of the American Astronomical Society, Vol. 41, p.196

Astronomy and Astrophysics

Astronomy

Scientific paper

An excellent candidate for the Terrestrial Planet Finder mission is an external occulter coronagraph like New Worlds Observer, in which the glare of the host star is blocked by an opaque starshade located between the star and the telescope which observes it. It has proven difficult to visualize and manage the interplay between starshade size and distance, telescope size, optical wavelength, and the depth of stellar suppression. The traditional method is to choose some parameters, calculate the stellar suppression, and iterate. This paper presents an alternate approach which exploits scaling relationships, allowing quick calculation of each new case and better visualization of the ramifications of a modest departure from that case. I apply this method to illustrate the pros and cons of a few different cases at different scales.

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