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Hubble Space Telescope
Pushing the Limits of High Contrast with the new BAR5 Aperture location on the 50CORON Aperture

The BAR5 aperture location on the 50CORON aperture has a demonstrated inner working angle of 0.25" and has achieved reliable high contrast results for bright circumstellar disks. As part of an effort to push the limits of contrast with STIS, the COS/STIS team is investigating the BAR5 location for high contrast by conducting an aggressive set of observations designed to achieve a working contrast limited by the photon noise in the wings of the STIS point spread function at the BAR5 inner working angle with a goal of obtaining contrasts of 10-6 or better. For more information please see this high contrast coronagraphy page.