1. AAAC Presentation JWST Status Eric P. Smith JWST Program Scientist

2. AAAC Presentation 11-October-2005 2 Topics JWST Cost Growth Science Assessment Team Findings and Program Response JWST Plans

3. AAAC Presentation 11-October-2005 3 Recent Programmatic Changes ~$1B net cost growth ~$180M at NGST and ~$35M at subs –Reevaluation of I&T effort (metrology, GSE) –Additional launcher-related testing requirements –Reallocation of technical resources (e.g., mass and power budgets) among observatory elements ~$85M in instruments and related elements ~$160M of recommended added contingency funding ~$600M for 22 month launch slip to 6/2013 –Launch vehicle uncertainty and lack of TAA –Budget profile limitations in FY06 and 07 –Schedule risk reduction (negotiated w/ NGST) Technology maturation efforts remain on schedule

4. AAAC Presentation 11-October-2005 4 Science Assessment Team (SAT) Findings “… the scientific case for the JWST mission has become even stronger since its highest ranking by the Decadal report in 2000.”  Retain current 6.5 meter primary aperture  Retain current instrument complement  Priority on unique capabilities, i.e., performance longward of 1.7 microns, given the limitations of other future ground and space-based assets Use prioritization as a guide to reduce cost and risk

5. AAAC Presentation 11-October-2005 5 SAT-Endorsed Changes SAT RecommendationProgram Response De-emphasize or eliminate low-priority instrument capabilities See next chart Simplify Integration & Test Revising Integration & Test plan (e.g., “cup-up” testing)  ~$130M & 3 months savings (TBR) Eliminate 1 µm encircled energy requirement Eliminate Level 1 requirement (possible degradation of imaging performance at shortest wavelengths)  enables simplified I&T (see above)  reduces mirror polishing schedule risk Relax scattered light requirement Change cleanliness levels (acceptable potential reduction in sensitivity)  enables “cup-up” layout, simplified I&T (see above) Relax optical stability requirement Change t stab = 30 days to t stab = 14 days (reduce observing efficiency ~1%)  reduces telescope backplane development risk Relax/eliminate anisotropy requirement Eliminate Level 2 Point-Spread-Function anisotropy requirement (no expected science impact)  reduces telescope development risk Maintain mission lifetime goal No change

6. AAAC Presentation 11-October-2005 6 SAT-Endorsed Changes: Science Instruments SAT RecommendationProgram Response Maintain short wavelength ( < 1.7 µm) instrument capabilities, but eliminate JWST architecture (ISIM level and above) requirements for testing/verification of these capabilities Revising Integration & Test and verification plans to comply with recommendation (fewer reverifications of lowest priority science modes, elimination of potentially infeasible tests)  specific cost and schedule benefits TBD Maintain current MIRI coronography capabilities No change Retain single channel tunable filter Eliminate short wavelength portion of tunable filter (loss of lowest priority science capability)  saves 80kg; improves mass margin  reduces complexity; enhances likelihood of on-time delivery of FGS

7. AAAC Presentation 11-October-2005 7 Moving Forward Consult scientists regarding JWST’s scientific significance, prioritize JWST’s capabilities Revise mission development plan PreliminaryFinal Independent Assessment Formulate budget May’05 Apr’06 Science Assessment Team (SAT) NASA’s Independent Program Analysis Office (IPAO)

8. AAAC Presentation 11-October-2005 8 JWST Replan It’s not over… –Additional study of I&T and verification plan forecast with ultimate conclusion around April 06 Will this happen again? –History of replans 8m  6m diameter requirement, Fall 2000 Replan I, Fall 2002 Replan II, Summer 2005 (see chart 9) Will the science change? –No, first light goal combined with NAS decadal position prohibits significant changes in observatory

9. AAAC Presentation 11-October-2005 9 HST Spending History HST (no servicing costs) JWST (Projection)

10. AAAC Presentation 11-October-2005 10 JWST Program Today Early emphasis on vigorous technology development to retire risk –Pacing items (primary mirror, detectors) already in Phase C/D and flight production ~$820M (~20% of Phase A through D total) invested so far today Concept DevelopmentDesign, Fabrication, Assembly and Test Formulation Authorization Non-Advocate Review (NAR) -Program Commitment- Launch science operations... Initial Confirmation Review (ICR) Phase A Phase B Phase C/D Phase E Formulation Implementation …

11. AAAC Presentation 11-October-2005 11 Summary Actions being taken to address JWST cost and schedule changes –Current estimated cost, inception through launch$3.7B –Current estimated cost, Oct’06 through launch$2.9B Science assessment complete –JWST reconfirmed as mission of paramount significance and priority –Scientific capabilities prioritized –Recommendations provide some cost savings and significant risk reduction; added flexibility for program management Preliminary replanning complete, FY07 budget adjusted and submitted –Science assessment recommendations embraced, being implemented –Launch in June 2013 Preliminary stage of independent assessment found program work plan fundamentally sound, but likely to need more time and money Detailed replanning will be complete by April 2006 –Fully implement embraced SAT changes –Follow-up independent review and assessment –Forms basis for FY08 budget development

12. AAAC Presentation Mission Objective Study the origin and evolution of galaxies, stars and planetary systems  Optimized for infrared observations (0.6 – 28  m) Organization –Mission Lead: Goddard Space Flight Center –International collaboration with ESA & CSA –Prime Contractor: Northrop Grumman Space Technology –Instruments: –Near Infrared Camera (NIRCam) – Univ. of Arizona –Near Infrared Spectrograph (NIRSpec) – ESA –Mid-Infrared Instrument (MIRI) – JPL/ESA –Fine Guidance Sensor (FGS) – CSA Description –Deployable telescope w/ 6.5m diameter segmented adjustable primary mirror –Cryogenic temperature telescope and instruments for infrared performance –Launch NET June 2013 on an ESA-supplied Ariane 5 rocket to Sun-Earth L2 –5-year science mission (10-year goal) James Webb Space Telescope (JWST) www.JWST.nasa.gov Phase A Phase B Phase C/DPhase E Telescope Primary Mirror (PM) Cold, space-facing side Sunshield Spacecraft Bus Warm, Sun-facing side Instrument module scale: 1 meter