A graveyard orbit is a parking zone in space where retired satellites are sent to spend eternity, safely out of the way of working spacecraft. It sits roughly 300 kilometers above the geostationary belt, the ring of orbits about 36,000 kilometers above Earth where communications and weather satellites operate. When a satellite reaches the end of its useful life, operators use its last remaining fuel to push it upward into this orbital junkyard rather than leaving it to drift among active missions.
Why Satellites Can’t Just Fall Back to Earth
For satellites orbiting relatively close to Earth, the standard practice is to lower their orbit so they re-enter the atmosphere and burn up. The FCC now requires low-Earth orbit satellites to complete this disposal within five years of ending their mission, a rule that took effect in late 2024 and replaced the older 25-year guideline.
Geostationary satellites don’t have that option. They orbit at about 35,800 kilometers, and slowing one down enough to drop it into the atmosphere would require an enormous amount of fuel. That fuel burn would eat deeply into the satellite’s operational lifespan, effectively cutting years off a multimillion-dollar mission just to dispose of it. The distance alone makes atmospheric re-entry impractical. Instead, a small push in the opposite direction, upward, moves the satellite out of the busy geostationary corridor at a fraction of the fuel cost.
How Much Fuel It Takes
Reaching a graveyard orbit is surprisingly cheap in fuel terms. A typical 2,000-kilogram geostationary satellite needs only about 8 kilograms of propellant to raise its orbit by the recommended minimum of 280 kilometers. That translates to a velocity change of roughly 12 meters per second, a tiny nudge by spacecraft standards. Mission planners reserve this fuel from the start, budgeting it into the satellite’s total propellant load so there’s always enough left for one final maneuver when the mission ends.
The exact altitude a satellite needs to reach depends on its physical characteristics. The international formula accounts for the satellite’s reflectivity and its size relative to its mass, because sunlight exerts a small but constant pressure on orbiting objects. A large, lightweight satellite with big solar panels gets pushed around more by sunlight than a compact, heavy one, so it needs to be parked higher to stay clear of the geostationary belt over the long term.
What Happens After Disposal
Once a satellite reaches its graveyard orbit, ground controllers send a final sequence of commands to shut down all instruments and decommission the spacecraft. From that point on, the satellite is an inert piece of metal drifting in a slow, slightly elliptical path above the geostationary ring. It will remain there for hundreds, potentially thousands, of years. There is no mechanism to bring it back or clean it up with current technology.
These retired satellites don’t stay perfectly still. Solar radiation pressure gradually shifts their orbits over time, changing their shape and tilt. The gravitational pull of the Moon and Sun also introduces slow wobbles. These effects are small on human timescales but significant over centuries, which is why the recommended disposal altitude includes a buffer above the minimum safe distance.
The Growing Collision Risk
Graveyard orbits solve one problem (keeping dead satellites away from working ones) while creating another: a slowly accumulating population of uncontrolled objects all sharing a similar orbital band. Research from the Aerospace Corporation and ESA found that the collision risk between disposed satellites in graveyard orbits is one to three orders of magnitude higher than the risk those same satellites pose to the active constellation below them.
For one studied scenario involving a medium-Earth orbit constellation, the cumulative probability of a collision between disposed satellites reached 2.4% after 100 years and climbed to 12.6% after 200 years. Alternative disposal strategies that place satellites into more eccentric (elongated) orbits can reduce that risk significantly, bringing the 200-year collision probability down to around 3%. But even low-probability collisions matter at these altitudes, because any debris generated would persist indefinitely with no atmospheric drag to clean it up.
Other Names for the Same Thing
You may see graveyard orbits referred to as “supersynchronous orbits,” “disposal orbits,” or informally as “junk orbits.” These all describe the same concept: a parking altitude above the geostationary belt reserved for decommissioned spacecraft. NASA uses “supersynchronous” and “graveyard” interchangeably in its training materials. The term “graveyard” has stuck in popular usage because it captures the reality: satellites sent there are permanently retired, with no prospect of retrieval or reuse.
The graveyard orbit concept applies primarily to geostationary satellites, but disposal strategies exist for other high-altitude orbits too. Navigation satellite constellations in medium-Earth orbit, like GPS, face similar disposal challenges and use comparable approaches, raising retired satellites above the operational altitude band. The underlying principle is the same: when you can’t bring a satellite down, move it up and out of the way.