Space astrometry project: Optical concept

Details Space astrometry project: Optical concept Space astrometry project: Optical concept

Mar 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975spam.rept...31b&link_type=abstract

In ESRO Space Astrometry p 31-35 (SEE N75-30957 21-89)

Physics

Optics

Astrometry, Mirrors, Spaceborne Telescopes, Spacelab, Td Satellites, Aberration, Astigmatism, Diffraction Patterns, Light Scattering, Mounting, Optical Equipment

Scientific paper

Solutions are proposed for a telescope Spacelab where an aplanatic system is sufficient because focals parallel to the grid can be used. In the TD option, an aplanatic system is required. It is possible to use four reflection optics (plane mirror, large concave mirror, small convex mirror, and a fourth reflection from the central part of the large mirror) or three reflection optics (deformed plane mirror, large mirror, small mirror). With four reflections, the residual aberrations are negligible. With three reflections, the residual aberrations are notable, but hardly compensatable. The scattered light seems easier to eliminate in the last case than in the former.

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