STARDUST Project CRITICAL EVENTS READINESS REVIEW COMET P WILD

STARDUST Project CRITICAL EVENTS READINESS REVIEW COMET P/WILD 2 ENCOUNTER READINESS PREPARATION T. Duxbury JPL: 303 -411 AM / 301 -427 PM LMA: MSA +1 818 354 -1275 08: 00 AM - 05: 00 PM PST 20 Nov 2003 CERR - Duxbury

STARDUST Total Workforce Operations, Science, E/PO and Management at JPL and LMA 20 Nov 2003 CERR - Duxbury

STARDUST SCOPE OF READINESS PREPARATION • Used the Flyby of Main Belt Asteroid Annefrank to Test Wild 2 Approach Operations, Timelines, Interfaces and Encounter Sequence – DRR and CERR Held before Event – Wild 2 E-3 d to E+1 d Timeline – Approach Geometry Significantly More Severe than Wild 2 Approach • Annefrank 30 deg from Sun, Required Large Attitude Turns and Performed on Batteries with Flyby Speed 7. 4 km vrs 6. 1 km/s at Wild 2 • Annefrank Too Dim to See Before Flyby – All Operations Performed Within Timelines – All Interfaces, Peer Reviews, Command Products Implemented/Validated – Survived Loss of 1 + 1/2 DSN Passes - Forced Quick Turn Around of Sequences – Radio/Optical Nav Performed w/ Encounter Annefrank/Star Images – Encounter Sequence Completely Successful • Collector Deployed, CIDA and DFMI on and Nucleus Tracking Captured All 72 Flyby Images • Nav too Accurate, Bank Turn Computed but too Small to Implement – Operations Would Have Succeeded at Wild 2 20 Nov 2003 CERR - Duxbury

STARDUST SCOPE OF READINESS PREPARATION • Produced New Wild 2 Dust Production Model – 10 Times Less Collectable Dust w/ Ten Times More Hazardous Dust – Peer Reviewed w/ 15 International Comet Scientists • James Rose Chaired Review • Current Model Viewed as Worst Case/Upper Limit to Large Dust • Recommended Earth-based Observations for Additional Validation • Produced New Wild 2 Ephemerides – Accuracy of Time of Encounter Degraded from 30 seconds to 180 seconds (1, 100 km 1 s) – Reviewed by Navigation Advisory Group (NAG) • Validated New Model • Recommended Earth-based Observations for Additional Validation 20 Nov 2003 CERR - Duxbury

STARDUST SCOPE OF READINESS PREPARATION • Reviewed Science Requirements and Spacecraft Safety – Moved Flyby from 150 km to 300 km for S/C Safety • Response to New Dust Model – Reduced Collection from 1, 000 Particles > 15 mm to 500 • Effect of New Dust Model – Reduced # Images Within 2, 000 km from 65 to 30 • Effect of Degraded Time of Encounter Uncertainty – New Mission Success Criteria in Approval Cycle at NASA HQ • Changes to Level 1 Requirements Need OSS Associate Administer Approval • Is a Given for This Review 20 Nov 2003 CERR - Duxbury

STARDUST SCOPE OF READINESS PREPARATION • • • Conducted Readiness Reviews of Key Operational Elements – Nav Readiness Review by Navigation Advisory Group (NAG) – Deep Space Mission Systems (DSMS) Readiness Review – Multi Mission Office (MMO) Ground Data System Readiness Review – Planetary Data System (PDS) Review of Data Archive Formats and Contents - Used for Operations as Well – Meetings with JPL Office of Communications and Education Continuing 20+ Full Tests of Encounter Sequence with Expected Range in Variables Plus Anomalies Nearing Completion in the Spacecraft Test Laboratory Conducting Operational Readiness Testing (ORT’s) – Radio + Opt Nav for E-2 d TCM Completed – E-2 d to E-6 h ORT Remaining – Science ORT Remaining – E/PO ORT Remaining Camera Cleanup Performed / Opt Nav Images Started Compliant w/ Flight Project Practices 20 Nov 2003 CERR - Duxbury

STARDUST SCOPE OF READINESS PREPARATION 20 Nov 2003 CERR - Duxbury

STARDUST READINESS • • • Simple Flyby Trajectory at Encounter – Straight Line Motion Past a Massless Body Moved from Previous Planned Flyby of 150 km to 300 km – Reduced Spacecraft Risk at Flyby by a Factor of 2 – Reduced Delivery Performance by Nav by a Factor of 2 Successful Flyby Totally Dependent on Op. Nav – Needs DS 1 Level of Sensitivity and Geometric Accuracy Op Nav Already Detected Wild 2 - Will Significantly Ease Encounter Operations – Deleted Many Contingency Plans if Detection was Late – No Need to Take Lots of Pictures and Co-Add on the Ground for Detection as Planned – Can Implement Leisurely Trajectory Correction Maneuver Schedule and Miss a Few if Needed The Remaining Presentations will Demonstrate – Relative Ease of Remaining Operations – Excellent Preparation and Qualifications of Flight Team – Robust Timeline w/ Excellent Margin and Contingency Strategies – The STARDUST Project is Ready for Wild 2 20 Nov 2003 CERR - Duxbury