GEO Satellite Stationkeeping Calculator
Spacecraft orbit maintenance: Calculate North-South (NSSK) and East-West (EWSK) gravitational perturbations, annual Δv budget, and lifetime propulsion propellant.
Mission Life & Spacecraft Configuration
Annual & Lifetime Stationkeeping Budget
Recommended Tools & Equipment
Tested hardware and components for high reliability
Frequently Asked Questions
Why does North-South stationkeeping (NSSK) consume over 90% of a GEO satellite's delta-v budget?
The Moon and Sun exert continuous gravitational torques on a geostationary orbit, pulling its orbital plane away from Earth's equatorial plane towards an inclination of ~15°. To keep dish antennas on the ground pointed accurately without tracking mechanisms, satellites must perform regular out-of-plane burns to cancel this inclination drift (~0.85° per year), consuming ~45–50 m/s/year out of a total ~52 m/s/year budget.
What are the Earth triaxiality libration points in geostationary orbit?
Earth's equator is not a perfect circle; it is slightly elliptical (J22 harmonic term). This gravitational lumpiness creates two stable gravitational valleys (libration points at 75.1°E over the Indian Ocean and 105.3°W over the Galápagos) and two unstable peaks. Satellites placed anywhere else experience a persistent tangential force pulling them toward the nearest valley, requiring periodic East-West burns (~2 m/s/yr).
What is the IADC graveyard orbit requirement for GEO satellites?
Inter-Agency Space Debris Coordination Committee (IADC) guidelines mandate that at end-of-life, geostationary satellites must use their remaining propellant to boost into a "supersynchronous graveyard orbit" at least 235 km + (1000 * C_R * A/m) km above the GEO ring (~300 km higher), ensuring they never drift back into operational commercial slots.