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Quick addition, APAS, in its androgynous form, fell out of favor in Russian circles simply because of mass. APAS is of a much greater mass than SSVP leading to the situation where only 2 cosmonauts could be flown instead of the usual 3. The mass of APAS attached led to too many sacrifices elsewhere on payload, so SSVP was carried on. The only time APAS/ASTP-...


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Question: How can the proposed LUVOIR space telescope slew to different directions while keeping the sunshade in a fixed orientation? What compensates? Also: I mention that it moves as a rigid body; in order to change the direction the telescope is pointing the whole spacecraft slews, including the sunshade. In layman terms i think you are asking what is ...


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Both LUVOIR-A and LUVOIR-B designs are intended to be supported at the end of an articulated arm as shown schematically in the figures below. By locating the upper pivot point close to the center of mass of the telescope reduces momentum issues. Details on the PAS (Payload Articulation System) can be found starting on page 8-50 of the LUVOIR Final Report (...


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