6th International Planetary Probe Workshop IPPW-6, Session III: Probe Missions to the Giant Planets, Titan and Venus OverviewOverview ofof FlagshipFlagship ClassClass VenusVenus MissionMission ArchitecturesArchitectures by Tibor S. Balint, James A. Cutts & Johnny H. Kwok Jet Propulsion Laboratory, California Institute of Technology Atlanta, Georgia IPPW-6 –IPPW-6 Balint, Architectures, Mission Venus Class of Flagship Overview June 24, 2008 Kwok, Cutts, June 24, 2008 Pre-decisional – for discussion purposes only Page-1 Outline • Introduction – Venus STDT & Study Overview – A world of contrasts – Extreme Environments of Venus – Role of Mission Architectures • Typical mission architectures at Venus • Venus STDT Process – VSTDT Process Description – Science & Technology Traceability & FOM • Interim Study Results • Conclusions IPPW-6 –IPPW-6 Balint, Architectures, Mission Venus Class of Flagship Overview June 24, 2008 Kwok, Cutts, Pre-decisional – for discussion purposes only Page-2 Introduction Venus STDT & Study Overview • NASA is interested in a high science-return inner solar system Flagship mission in addition to Mars Sample Return – Target Launch: 2020 – 2025 – Life Cycle Mission Cost Range: $3-4B (FY’08) – Technology Maturation: TRL 6 by 2015 • Venus STDT formed on 1/8/08 by NASA – to define a Flagship-class mission to Venus • The combined team of scientists, engineers and technologists is tasked to – determine prioritized science objectives, – recommend suitable flagship class mission architectures, – assess cost, and other mission elements – recommend a Venus technology development roadmap • Final report due to NASA by late November 2008 IPPW-6 –IPPW-6 Balint, Architectures, Mission Venus Class of Flagship Overview June 24, 2008 Kwok, Cutts, Pre-decisional – for discussion purposes only Page-3 Introduction Acknowledgments – VSTDT & Study Team Atmosphere Subgroup Technology • David Grinspoon (DMNS) • Elizabeth Kolawa (JPL) • Anthony Colaprete (NASA Ames) • Viktor Kerzhanovich (JPL) • Sanjay Limaye (U. Wisconsin) • Gary Hunter (NASA GRC) • George Hashimoto (Kobe U.) • Steve Gorevan (Honeybee Robotics) • Dimitri Titov (ESA) • Eric Chassefiere (U. of Nantes--France) Ex Officio • Hakan Svedhem (ESA) • Ellen Stofan (VEXAG Chair) Geochemistry Subgroup • Tibor Kremic (NASA GRC) • Allan Treiman (LPI) • Steve Mackwell (LPI) JPL Venus Flagship Study Core Team • Natasha Johnson (NASA GSFC) • Johnny Kwok (Study Lead) • Tibor Balint (Mission Lead) Geology and Geophysics • Craig Peterson • Jim Head (Brown University) • Tom Spilker • Dave Senske (JPL) • Bruce Campbell (Smithsonian) NASA and JPL • Gerald Schubert (UCLA) • Jim Cutts (JPL) • Walter Kieffer (LPI) • Adriana Ocampo (NASA HQ) • Lori Glaze (NASA GSFC) IPPW-6 –IPPW-6 Balint, Architectures, Mission Venus Class of Flagship Overview June 24, 2008 Kwok, Cutts, Pre-decisional – for discussion purposes only Page-4 Introduction Venus: World of Contrasts Solar wind • Why is Venus so different from Earth? – What does the Venus greenhouse tell us about climate change? Atmosphere • Could be addressed with probes & balloons at various altitudes – How active is Venus? Climate • Could be addressed with orbiters & in-situ elements Crust – When and where did the water go? • Could be addressed with landers Core Ref: M. Bullock, D. Senske, J. Kwok, Venus Flagship Study: Exploring a World of Contrasts (Interim Briefing), NASA HQ, Ref: Image by E. Stofan & T. Balint May 9, 2008 Ref: VEXAG White Paper, 2007-2008 IPPW-6 –IPPW-6 Balint, Architectures, Mission Venus Class of Flagship Overview June 24, 2008 Kwok, Cutts, Pre-decisional – for discussion purposes only Page-5 Introduction The Extreme Environment of Venus • Greenhouse effect results in VERY HIGH SURFACE TEMPERATURES • Average surface temperature: ~ 460°C to 480°C • Average pressure on the surface: ~ 92 bars • Cloud layer composed of aqueous sulfuric acid droplets – at ~45 to ~70 km attitude • Venus atmosphere is mainly CO2 (96.5%) and N2 (3.5%) with: – small amounts of noble gases (He, Ne, Ar, Kr, Xe) – small amount of reactive trace gases (SO2, H2O, CO, OCS, H2S, HCl, SO, HF …) • Zonal winds: at 4 km altitude ~1 m/s; at 55 km ~60 m/s; at 65 km ~95 m/s • Superrotating prograde jets in the upper atmosphere Ref: C. Wilson, U of Oxford, Personal communications Ref: V. Kerzhanovich et al., "Circulation of the atmosphere IPPW-6 –IPPW-6 Balint, Architectures, Mission Venus Class of Flagship Overview June 24, 2008 Kwok, Cutts, from the surface to 100 km", Pre-decisional – for discussion purposes only Page-6 Introduction Role of Mission Architectures e.g., - mission class (flagship, NF, Discovery) e.g., - NRC Decadal Survey; - mission cost cap - VEXAG goals & objectives - SSE Roadmap; mission lineup - Project science team - international collaboration measurements & investigations Science Programmatics Mission Architectures Technologies e.g., - extreme environments technologies e.g., - single or multi-element architecture - systems approaches: - single or dual launch tolerance, protection & hybrid systems - mission elements (orbiter, flyby, - atmospheric entry, descent, landing, balloon, lander, probe, plane) balloon inflation - lifetime (hours, weeks, years) - instrument technologies - telecom link (relay, Direct-to-Earth) Note: NF – New Frontiers mission class (assumed cost cap: ~$650M w/o launch vehicle) Flagship class (assumed cost cap: ~$2-4B); Discovery class (assumed cost cap: ~$450M) IPPW-6 –IPPW-6 Balint, Architectures, Mission Venus Class of Flagship Overview June 24, 2008 Kwok, Cutts, Pre-decisional – for discussion purposes only Page-7 Mission Architectures Potential Venus Mission Elements IPPW-6 –IPPW-6 Balint, Architectures, Mission Venus Class of Flagship Overview June 24, 2008 Kwok, Cutts, Pre-decisional – for discussion purposes only Page-8 Mission Architectures Grouping of Typical Venus Mission Architectures Earth-to-Venus Cruise (~180 days) Remote Sensing In-Situ Short Observation Long Observation Short Lived Long Lived Pioneer-Venus High altitude Flyby Spacecraft Orbiter type balloon Descent Probe (~60-65 km) Multi-Element Venera type Architectures Lander Balloon to Lower Clouds Venus In-Situ (~30-40 km) High Altitude Orbiter + Explorer Balloon + Multi-probes (VISE) Micro-probes Long Lived Seismic Lander Network Sample Return Balloon Network Venus Atmospheric Venus Mobile Mission Class Floor: Sample Return Explorer Free Return Trajectory (VME) Small mission -Air mobility, or Heritage Medium mission Venus Surface - Surface rover SSE Roadmap Sample Return Large mission recommended Ref: Cutts, Balint, “Overview of typical mission architectures”, 3rd VEXAG meeting, Crystal City, VA, Jan.11-12, 2007 IPPW-6 –IPPW-6 Balint, Architectures, Mission Venus Class of Flagship Overview June 24, 2008 Kwok, Cutts, Pre-decisional – for discussion purposes only Page-9 VSTDT Process Description Flowchart for the VSTDT FOM Process • Figure of Merit (FOM) Calibrate Rapid Cost Assessment combines Estimation for of Mission (13) Architecture Architecture – Science ranking Elements – Technology ranking Concepts – Mission architectures Rapid Costing – Programmatics (e.g., costs) for Representative Mission Architecture Concepts Venus STDT Assessment Assess Figure of Merit Science Map Investigation Science FOM (FOM) for 17 Flagship VEXAG Goals, to Instruments & for Investigations & Mission Architectures Objectives, & (from Science Score & Cost Measurements Arch. Elements Mission Architectures & Technology Score) Technology Rate Technologies Technology FOM EE Technologies for Arch. Elements Criticality / Maturity & Instrument Tec for Criticality & Maturity For Arch. Elements Science Subgroups To Recommend Desired Flagship Mission Architecture Concepts Phase 2: Redefine Flagship Class Proceed With Mission Architecture Recommended Concept, Endorsed by Ref: M. Bullock, D. Senske, J. Kwok, Venus Flagship Study: Mission Architecture(s) the 3 Science Subgroups Exploring a World of Contrasts (Interim Briefing), IPPW-6 –IPPW-6 Balint, Architectures, Mission Venus Class of Flagship Overview June 24, 2008 Kwok, Cutts, NASA HQ, May 9, 2008 Pre-decisional – for discussion purposes only Page-10 VSTDT Process Description Science Traceability Matrix & Technology Assessment Investigations Measurement Technique & Instrument type Architecture Element • Two technology categories: –For operation and survivability of subsystems on architectural elements –For science measurements. subgroup • Technology Assessment Process: – STDT technology sub-group Geology & Geophysics identified major technology drivers for all potential missions – Technology Figure of Merit (FOM) was determined using two factors: subgroup Atmospheres • Technology criticality for a specific architecture element – assessed by the mission architecture team subgroup • Technology maturity Geochemistry – assessed by the technology sub-group Flagship Priority Scoring Instrument & Platform Goodness Scores (Column E) Directly answers 1 = Essential to have Major contribution Science & Technology FOMs were 2 = Highly Desirable Minor contribution or then used in the overall proposed 3 = Desirable supporting observations Priorities mission architecture selection 4 = Very Good to have Does not address IPPW-6 –IPPW-6 Balint, Architectures, Mission Venus Class of Flagship Overview June 24, 2008 Kwok, Cutts, Pre-decisional – for discussion purposes only Page-11 Architecture Element Figure of Merit (FOM) Summary of FOM & Costing for Mission Architecture Elements Architecture Element Multiple EntryProbe Multiple Near-Surface