Stars-894

| Risk ID | Description | Likelihood | Impact | Mitigation | |---------|-------------|------------|--------|------------| | R1 | Radiation‑induced degradation of CZT detector. | Medium | High | Use radiation‑hard shielding (Al + Polyethylene); implement on‑board annealing cycles. | | R2 | Insufficient downlink bandwidth for burst data. | Low | High | Dual‑band Ka‑link for burst mode; on‑board data compression (lossless). | | R3 | Launch vehicle delay. | Medium | Medium | Backup launch provider (Ariane 6) contracted; schedule float. | | R4 | Software bugs in real‑time trigger algorithm. | Low | High | Independent verification & validation; hardware‑in‑the‑loop testing. | | R5 | Space‑weather induced anomalies (charging). | Medium | Medium | Incorporate conductive coatings; frequent charge‑control monitoring. |

A Risk Register (Appendix C) tracks mitigation status quarterly. STARS-894

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    • Feature Draft – STARS‑894
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    | Parameter | Value | |-----------|-------| | Platform | 600 kg, 3‑U (12 U) modular bus (derived from SpaceX Star‑link bus heritage). | | Orbit | Sun‑synchronous LEO, 550 km altitude, 98.2° inclination. | | Power | Deployable 12 m² solar array; 2 kW bus power (peak 2.5 kW). | | Attitude Control | 3‑axis reaction wheels + magnetorquers; pointing accuracy ≤ 0.05°. | | Thermal Control | Passive radiators + active loop heat pipe for detector cooling (−30 °C). | | Command & Data Handling | Dual‑redundant RAD750 processors, 8 TB solid‑state recorder. | | Communications | X‑band (downlink) + Ka‑band (high‑rate burst) via NASA Deep Space Network (DSN) 34 m stations. | | Launch Vehicle | Preferred: Falcon 9 (FT) – 2027 Q3; backup: Ariane 6. | Keyboard – Arrow‑up/down to navigate, Enter to accept,

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