Other
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.672v&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 International Space Station (ISS) has a number of locations for external payloads that are suitable for astronomical and space science observations. Each of the international partners providing science facilities to the United States on Orbit Segment (USOS) section of the ISS have included opportunities for external payloads. One attribute that all the sites have in common is that the ISS acts as the spacecraft, allowing the science team to concentrate on the science instrumentation. Physically, the various facilities available have somewhat different accommodations in terms of the size and mass of the payload accommodated and the resources of power and data services. In addition, each location has a different field of view due to the self-blockage by ISS elements and structures. We address these issues as well as the ISS orbit for space science for the four external payload accommodations described below. The four external payload accommodations that will be discussed are the USOS Truss Segment 3 (S3), the EXPRESS Pallet System (ExPS) when mounted on S3, the Columbus Exposed Payload Facility (CEPF), and the Japanese Experiment Module - Exposed Facility (JEM-EF). The S3 has four sites available for payloads. Two of these sites are on the zenith side of the truss and provide deep space viewing. The current NASA long-term plans are to mount an EXPRESS Pallet on one of the available zenith S3 Truss sites with the other being populated by large payloads, the first of which will be the Alpha Magnetic Spectrometer. The ExPS is a facility that can be attached at the NASA primary external locations on the S3 Truss to support up to six smaller payloads. The ExPS consists of the EXPRESS Pallet, the EXPRESS Pallet Controller and the EXPRESS Pallet Adapters. User developed payloads are attached and interfaced to the EXPRESS Pallet Adapter and through this EXPRESS Pallet Adapter, the EXPRESS Pallet System provides the payloads with an attachment location, power, and data. The CEPF consists of two mounted structures attached to the starboard end-cone of the Columbus module. Each of these structures has accommodations for attaching two external payloads. One of the four sites provides and excellent zenith view and on of the other sites provides a significant zenith viewing opportunity. The mechanical attachment is compatible with that of the EXPRESS Pallet. The JEM-EF is module-sized structure attached to port end-cone of the JEM Pressurized Module. There are ten locations for attaching payloads and each of the locations provides some zenith viewing. Eight of the sites also provide similar simultaneous viewing of the earth, allowing for science programs that require both space and earth observations.
Dettman J.
Takayanagi Masahiro
Voels Stephen A.
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