How do you address space debris mitigation in spacecraft design?

Space debris mitigation addresses growing collision risk and long-term space sustainability. Design requirements (per IADC guidelines, national policies): End-of-life disposal - LEO: deorbit within 25 years (propulsive or drag devices), GEO: boost to graveyard orbit (300+ km above GEO); Passivation - Deplete propellants and pressurants, Disconnect batteries, and Safe reaction wheels; Collision avoidance - Trackable catalog comparison, Conjunction assessment and maneuver capability. Design impact: Propellant allocation for disposal, Deorbit propulsion system or drag augmentation device, Passivation valve design, and Operational margin for avoidance maneuvers. Analysis: Orbital lifetime prediction, Collision probability assessment (NASA DAS, ESA DRAMA), and Post-mission disposal success probability. Small satellite challenges: Propulsionless designs need drag devices, Lower altitude to ensure decay, and Active debris removal as backup. Regulatory: FCC, ESA, and national requirements for licensing. Design for Demise: Materials that burn up during reentry, reducing ground casualty risk.