What's New

Numerical Force Models

astroz now includes high fidelity force models for orbit propagation, all implementing a common ForceModel interface:

• Zonal harmonics: J2, J3, and J4 Earth oblateness perturbations
• Atmospheric drag: Exponential density model with solar activity scaling
• Solar radiation pressure: Includes cylindrical Earth shadow model
• Composite model: Combine multiple force models into a single propagation pipeline

Dormand-Prince 8(7) Adaptive Integrator

A new high order adaptive step size integrator (DormandPrince87) for long duration, high accuracy propagation. Configurable absolute and relative tolerances, and compatible with all force models.

CSPICE Integration

Optional NAIF CSPICE bindings (enabled with -Denable-cspice=true) for high precision planetary ephemeris and leap second handling. Planetary kernels are fetched automatically at build time.

New Examples

• conjunction_screening.zig — Collision avoidance screening
• maneuver_planning.zig — Hohmann transfers with J2 effects
• constellation_phasing.zig — RAAN drift for Walker constellations
• spice_propagation.zig — High-precision propagation with CSPICE ephemeris