| Popis: |
JWST has been successfully launched on an Ariane5 rocket from Kourou (French Guiana Space Centre). This launch marked the debut of JWST journey in Space on its way to its halo orbit around L2. The success of the Ariane 5 launch as well as that of the deployment of JWST that followed are the results of many and in particular the results of close cooperation and partnerships involving USA (NASA), CANADA (CSA) and EUROPE (ESA). Europe is a partner of JWST project through ESA participation in this project (ie NIRSpec MIRI instruments as well as launch responsibility). This paper presents the Ariane 5 launch and some of the specificities that have been put in place for JWST mission. Among the specificities for this launch were: - Specific depressurization under the fairing in order to avoid any shock during opening. - Specific roll manoeuver during EPC and ESCA propelled phases towards injection point in order to protect JWST from the sun. - Once JWST has been released, the Upper stage has indeed performed a divert manoeuver (with hydrogen cold gas blow down through the main engine) in order to get out of the way from JWST thus providing a clear path to JWST as it travels towards L2 Lagrange point. This paper focuses on the 3rd point above-described (ie Upper Stage End-Of-Life-Manoeuvre EOLM)This paper provides insights of: - Ariane5 mission to deliver JWST orbit - Orbital sequence (Releasing JWST and upper stage getting out of JWST way) - Short term and long term non-collision as well as short term non-pollution justifications as the Upper Stage was manoeuvring to get out of JWST path. |
