Graveyard Orbit

When a satellite high above Earth reaches the end of its life, it is often too high to safely drop back home and burn up. Instead, controllers nudge it into a “graveyard orbit” — a quiet parking spot just outside the crowded, valuable orbits where working spacecraft live.

Quick facts

• Also called: a disposal, junk, or supersynchronous orbit.
• Where it sits: at least about 300 km above the geostationary ring, which is itself 35,786 km up — so roughly 36,086–36,186 km altitude.
• Cost to get there: a velocity change (delta-v) of about 11 m/s, versus roughly 1,500 m/s to bring a geostationary satellite all the way down to burn up.
• Fuel needed: about the same amount a satellite would use for three months of normal position-keeping — which is why the move is made roughly three months before the tank runs dry.
• How long it stays: essentially forever; abandoned craft drift for centuries, with their tilt (inclination) slowly wandering up to about 15° over the decades.
• Speed: a satellite at geostationary altitude moves about 3.07 km/s; in the graveyard, slightly slower.

How it works

In space, altitude and speed are linked: the higher an orbit, the slower it moves and the longer it takes to circle the planet. To retire a geostationary satellite — one that sits over a fixed point on the equator — controllers fire its thrusters in the direction it is already traveling (a “prograde” burn). This adds a small amount of speed and lifts the orbit a few hundred kilometers higher.

Why not just bring it home? De-orbiting from that height down to the atmosphere would demand an enormous velocity change of about 1,500 m/s, far more fuel than any satellite keeps in reserve. Lifting it out of the busy band instead costs only about 11 m/s — well over a hundred times cheaper. The 300 km buffer is wide enough that gentle nudges from sunlight (solar radiation pressure) and the gravity of the Moon and Sun cannot drag the dead craft back into the active belt for a very long time. Finally the satellite is “passivated” — leftover fuel is vented and batteries are drained so it cannot explode later — and then left to drift.

Why it’s used

The geostationary ring is a one-of-a-kind, limited resource. Only a single thin band directly over the equator lets a satellite hover at a fixed spot in the sky, so that band must be kept clear of dead hardware. Moving retired satellites out of it lowers the chance of collisions that could shatter into debris and trigger a cascading chain reaction (a Kessler-type runaway, where one crash spawns more crashes).

Rules back this up. The U.S. Federal Communications Commission requires every geostationary satellite launched after 18 March 2002 to commit to a graveyard-orbit disposal, and the European Space Agency treats clearing the ring as essential. The maneuver is done before the fuel runs out — usually about three months ahead — because a satellite that dies first can never be moved.

It is a practical compromise, not a true cleanup. The craft is relocated, not destroyed, so junk slowly piles up in the graveyard region. And moving a satellite aside does not make it safe forever: even working geostationary satellites can fail and break apart, as Intelsat 33e did when it shattered in geostationary orbit in October 2024, scattering dozens of trackable fragments. The disposal burn also forces early retirement and lost revenue, which is partly why compliance was historically poor: through 2005, only about one-third of geostationary satellites were disposed of properly.

Notable missions

• TDRS-1 — NASA’s first Tracking and Data Relay Satellite, launched in 1983; raised to a graveyard orbit in June 2010 after long service.
• TDRS-4 — launched 1989; boosted above the geosynchronous belt around 2012 once worn-out batteries forced its retirement.
• Intelsat 511 — a retired satellite left without position-keeping, now drifting in a steeply tilted (~13°) graveyard orbit — a vivid example of how abandoned craft wander.
• SNAP-10A — a U.S. nuclear-reactor satellite parked in a long-life disposal orbit roughly 700 nautical miles (about 1,300 km) up, expected to stay there for around 4,000 years.

A graveyard orbit buys time rather than solving the problem. Unlike low-orbit satellites that can dive into the atmosphere and burn up, high-flying geostationary craft have no clean exit, so for now the best option is simply to lift them aside and keep the precious ring open for the satellites still doing useful work.