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Orbital Debris Assessment

Orbital Debris Assessment. PDR ODA has been completed: Forwarded to UCB, GSFC Explorers office, and to KSC. Following PDR, will work with UCB to remove TBD/TBRs Will work with GSFC/JSC to assess validity of approach and analyses ODA Guideline Compliance Status:

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Orbital Debris Assessment

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  1. Orbital Debris Assessment • PDR ODA has been completed: • Forwarded to UCB, GSFC Explorers office, and to KSC. • Following PDR, will work with UCB to remove TBD/TBRs • Will work with GSFC/JSC to assess validity of approach and analyses • ODA Guideline Compliance Status: • 3.1 OPERATIONAL DEBRIS PASSING THROUGH LEO • Guideline met: No debris released from pyrotechnic devices due to boots and restraints, vs a guideline of less than 1mm (TBR). • 3.2 OPERATIONAL DEBRIS PASSING THROUGH GEO • Guideline met: No debris released from pyrotechnic devices due to boots and restraints, vs a guideline of less than 5 cm (TBR). • 4.1 ACCIDENTAL EXPLOSIONS DURING MISSION • Guideline met: Li-Ion Battery will have active charge control to prevent over charge • Guideline met: Tanks are Inconel, designed to leak before burst at operational pressures • 4.2 ACCIDENTAL EXPLOSIONS AFTER COMPLETION OF MISSION OPERATIONS • Guideline TBD: Plan for depleting Batteries is TBD • Guideline met: Tanks will be completely emptied during depletion burn (no internal diaphragm) • 4.3, 4.4, 4.5 INTENTIONAL BREAKUPS • Guideline met: All operations preclude intentional breakups.

  2. Orbital Debris Assessment • ODA Guideline Compliance Status: • 5.1 ASSESSMENT OF COLLISIONS WITH LARGE OBJECTS DURING MISSION OPERATIONS • Guideline met: Total probability of any THEMIS probe having a collision with large objects is less than 9.43E-6, vs guideline of less than 0.001. (for Probes only; Delta 3rd stage and PC assessment to be performed by KSC) • 5.2 ASSESSMENT OF COLLISIONS WITH SMALL DEBRIS DURING MISSION OPERATIONS • Guideline met: Probability of failure during the nominal 2-year mission life of 0.0015 vs guideline of less than 0.01. • 6.1 DISPOSAL FOR FINAL MISSION ORBITS PASSING THROUGH LEO • Guideline met: Probes in orbits P1 and P2 re-entering within 12 years with targeted depletion burns, and remaining Probes and Probe Carrier re-enter within • 5 years with depletion burns. (From CSR) • 6.4 RELIABILITY OF POSTMISSION DISPOSAL OPERATIONS • Guideline TBD: Reliability calculation is TBD • 7.1 LIMIT THE RISK OF HUMAN CASUALTY • Guideline met: Each Probe casualty area is 2.6768 m2, vs guideline of less than 8 m2. • Guideline met: PC with 3rd stage casualty area is 1.0439 m2, vs 8 m2. • Note: 7.1 is per event – “An upper limit of 8 m2 is derived by assuming an average risk of human casualty of 0.0001 per reentry event.”

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