Abstract
This paper describes the IRIS system, an Italian upper stage that will operate from the U.S. Space Shuttle to inject payloads up to 900 kg mass into geostationary orbit. This description is a summary of the information included in the IRIS User's Manual that has been issued to provide possible users with the necessary performance data, environment and interfaces for their payloads. The IRIS User's Manual will be delivered as soon as possible to every organization, institute or industry that may be interested in using the system. A review of the status of the project, which is nearing completion, is presented. The first flight unit will be launched in August 1991 with the LAGEOS 2 satellite as payload. The paper is completed by information about the development program that will be funded by the Italian Space Agency aimed at enhancing the performances of the Shuttle upper stage and at studying the application of IRIS as the third or fourth stage of expendable launch vehicles. Notice of private studies conducted by Aeritalia on IRIS utilization for this last application will also be provided.
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