Jupiter System Observer Mission Study: Final Report - Lunar and ...

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01 NOVEMBER 2007 2007 JUPITER SYSTEM OBSERVER MISSION STUDY: FINAL REPORT SECTION 4— MISSION CONCEPT IMPLEMENTATION Task Order #NMO710851 4.10 Programmatics 4.10.1 Schedule The JSO team selected a development lifecycle duration of 15/15/30/30 months for Phase A/B/C/D respectively. This is within the range of “Rules of Thumb” for flagship missions recommended by the JPL Project Formulation Office with the exception of phase D where the range is between 18 – 24 months. Here, the study team took a more conservative approach of 30 months, particularly in view of potential foreign contribution with the complication of ITAR and Technical Assistant Agreements during test and integration. Figure 4.10-1 shows the start date of Phase A needed to meet the available launch opportunities. The first available VEEGA opportunity in the 2015 to 2022 time frame is a January 2015 launch. It would require accelerating Phase A with significant investment in 2008 and would incur schedule risk. There is a launch opportunity in July 2015 that was not considered by the JSO team but is currently planned by the Europa Explorer study team. It would require significant investment in 2008 and mass reduction for JSO. There is a launch opportunity in September of 2016 but it arrives at Jupiter later than the January 2017 launch trajectory. With these considerations, the JSO Project Start Jul 2007 Jan 2008 Mar 2009 July 2009 A 15 mo B 15 mo C 30 mo A 15 mo B 15 mo A 15 mo B 15 mo A 15 mo B 15 mo 4-64 team selected the January 2017 launch as the baseline. Figure 4.10-2 shows the key activities and milestones of the major systems that conform to the Principles and Practices recommended by the JPL Project Formulation and Implementation Offices. The schedule includes a pre-phase A period during 2008 and 2009. This period will be used to reduce risk in several areas and thus reduce cost uncertainty. The current PP implementation assumes the probability of contaminating the Ganymede ocean is vanishingly small and therefore the bus and instrument components do not require sterilization by dry heat. Pre-phase A includes analysis leading to a decision prior to SRR. Pre-phase A also includes the formation of the project science team that will continue to refine the mission architecture, help establish level 1 requirements, identify descope options and define the science floor. The engineering teams will conduct trades and generate scenarios that will lead to definition of the instrument performances and interfaces (mass, power, volume, data, electrical, mechanical, thermal, radiation tolerance, reliability, pointing, alignment, shared optics, operations, data products, and team responsibilities) in support of the instrument Announcement of Opportunity. Accelerate A, significant investment 2008 with schedule risk Significant investment 2008, need mass reduction D 30 mo C 30 mo D 30 mo Has later arrival date than Jan 2017 launch C 30 mo D 30 mo Pre-A in 2008, refine architecture, science definition, & payload req C 30 mo D 30 mo Figure 4.10-1. 2017 launch date provides good lead time for start of Phase A. Launch Jan2015 July2015 Sep2016 Jan2017
2007 JUPITER SYSTEM OBSERVER MISSION STUDY: FINAL STUDY 01 NOVEMBER 2007 Task Order #NMO710851 SECTION 4—MISSION CONCEPT IMPLEMENTATION Fig. 4.10-2. JSO Project Schedule. 4-65
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