Other
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.848g&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Other
Scientific paper
the possible role of the ISS for spacecraft servicing for future, mostly scientific missions. Whereas in most cases the benefit to mission success was clearly visible, the cost aspects however outruled the ISS involvement in favour of non-servicing mission. With the enhancements in space science however, more powerful space observatories require aperture sizes that are far beyond the envelope of existing or planned launch vehicles, clearly underscoring the role of the ISS for servicing or construction of large observation facilities. The paper presents the pilot case of the X-Ray Mission for Evolving Universe Spectroscopy (XEUS), as studied for ESA by an industrial team lead by Astrium, Bremen involving Dornier, Media Lario and Fokker Space. The team analysed the feasibility of XEUS assembly in orbit, being a realistic example for various other planned, very large free-flying spacecraft to make use of ISS services. The study case assumes an initial operation of a base mirror spacecraft with some 4 m aperture and a detector spacecraft to be launched in a single mission. Both spacecraft operate for an initial period of five years, the mirror spacecraft then rendezvous with and docks to the ISS where the aperture is increased to 10 m by mirror petals transported to the ISS by the Space Shuttle. This servicing is done robotically with just one final inspection using extra-vehicular crew activity. After successful servicing operation, the mirror spacecraft undocks from the ISS, rendezvous with and docks to a new detector spacecraft, transfers to the operational orbit where both spacecraft fly in close controlled formation 50 meters apart. XEUS stretches the ISS capabilities to a servicing base for large scientific spacecraft, thereby enhancing its value for the scientific community and leading to a wider public acceptance as a space base performing extra-ordinary science.
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