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THEMIS PROBE MISSION PRE-SHIP REVIEW (Update on repressurization) Michael Sholl

THEMIS PROBE MISSION PRE-SHIP REVIEW (Update on repressurization) Michael Sholl University of California – Berkeley RCS Engineer. Repressurization Limits. Thruster qualification levels (MR111C 1lbf thrusters) Steady-state upper limit: 450psi

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THEMIS PROBE MISSION PRE-SHIP REVIEW (Update on repressurization) Michael Sholl

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  1. THEMIS PROBE • MISSION PRE-SHIP REVIEW • (Update on repressurization) • Michael Sholl • University of California – Berkeley • RCS Engineer

  2. Repressurization Limits • Thruster qualification levels (MR111C 1lbf thrusters) • Steady-state upper limit: 450psi • Pulsed upper limit: 400psi (Radarsat, Landsat 6) • THEMIS operational upper limit: 400psi • Pulsed qualification lower limit: 80psi • Additional ATP testing on all THEMIS flight units to 50psi • THEMIS operational lower limit: 75psi • Required: Offload 0.5kg N2H4 (see next slide)

  3. Operational Constraints • 10m/s Δν required by mission operations (0.5kg) • N2H4 loading requirement: 48.8kg ±0.2kg • KSC fueling group scale accuracy: 0.2kg • Precision weights used to increase accuracy further • Conclusion: healthy repressurization margins with 0.5kg N2H4 offload

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