STARDUST 20 Nov 2003CERR - Mastrodemus1 of 10 STARDUST Project CRITICAL EVENTS READINESS REVIEW COMET P/WILD 2 ENCOUNTER OPTICAL NAVIGATION N. Mastrodemos JPL: AM / PM LMA:MSA :00 AM - 05:00 PM PST 20 Nov 2003

STARDUST 20 Nov 2003CERR - Mastrodemus2 of 10 Optical Navigation Requirements Need to detect 8th visual magnitude stars at signal-to-noise 7 or higher both outside and through-periscope to support approach OpNav. –Most recent images outside periscope confirm that Need to model camera geometric parameters to < 0.2 pixels –Latest images yield results at 0.2 pixel level Need to Detect Wild 2 > E-8d for Ease of Operations –Wild2 already detected as of Nov 17 This level of performance will provide 16 km (1-  ) flyby control accuracy at E-18h to insure dust collection, spacecraft safety and carrier signal during flyby

STARDUST 20 Nov 2003CERR - Mastrodemus3 of 10 Wild 2 Windowed frameWild 2 in a 15 sec exposure

STARDUST 20 Nov 2003CERR - Mastrodemus4 of 10 Observation Plan Most OpNav image set consists of 25 windowed frames with exposures in the second range. E-50 to E-30d: Two image sets per week E-30d to E-10d: One image set per day E-10d to E-3d: 3 image sets per day E-3d to E-12h: 1 image set/hour (up to 16 frames per set) Windowed images used for calibration and at Annefrank approach –Already imaged Wild2 with windowed images OpNav tools and people performed same functions at DS1 / Borrelly Baseline plan sufficiently adequate to tolerate data loss with acceptable degradation in delivery accuracy. E.g. a 50% data loss will increase the flyby delivery error to ~26 km (1-  )

STARDUST 20 Nov 2003CERR - Mastrodemus5 of 10 Remaining Efforts Determine need for additional camera heating, geometric calibration Characterize camera sensitivity and window parameter definition for imaging through periscope within E-10d –Necessary images will be taken and processed by early- December Determine if OpNav backup at LMA can be provided –NAG RFA –Only needed if catastrophic event occurs at JPL –Action Item on MMO, expected resolution by mid-December

STARDUST 20 Nov 2003CERR - Mastrodemus6 of 10 Opt Nav Navigation Readiness All operations, timelines and interfaces tested successfully at Annefrank flyby Same ops facilities as with ORT. Use of institutional software and/or tools certified by DS1. Workforce with backups and contingencies in place –LMA Backup under Study (OpNav related RFA) Navigation Advisory Group (NAG) readiness review successfully completed –Agreed that OpNav was ready, tested and qualified for Wild 2 encounter operations –No open ISA’s –No first time events

STARDUST 20 Nov 2003CERR - Mastrodemus7 of 10 Training Lunar flyby images Cruise star calibration images Annefrank –Radio + optical orbit determination using Annefrank flyby ORT’s DS1/Borrelly Wild2 started Final ORT (E-2d – E-18h) in early December