What Is a Graveyard Orbit? Satellite Disposal Explained

📘 Definition

A graveyard orbit — also called a disposal orbit — is a region roughly 300 km above the geostationary belt (35,786 km) where retired GEO satellites are moved at the end of their working lives. Deorbiting a spacecraft from that height down to atmospheric re-entry would demand about 1,500 m/s of delta-v — an impractical amount of propellant — so operators instead nudge it slightly higher, a manoeuvre needing only ~11 m/s (about three months of station-keeping fuel). This frees the tightly packed corridor where working satellites hold their orbital slots. The craft is then passivated — its fuel vented and batteries discharged — so it cannot later explode and scatter debris across the region.

35,786 km

GEO Belt Altitude

~300 km above GEO

Re-orbit Height

~11 m/s

Re-orbit Delta-V

Millions of years

Orbital Lifetime

Understanding Graveyard Orbit

Why boost up instead of deorbiting?

The decision comes down to propellant. From geostationary orbit, dropping a satellite into the atmosphere means lowering its perigee by tens of thousands of kilometres — a burn of roughly 1,500 m/s. Raising it a few hundred kilometres into the graveyard needs only about 11 m/s, well over a hundred times less. Because a satellite carries only a finite propellant load, spending an entire mission's worth of fuel on disposal is unrealistic, so the small orbit-raising burn — reserved from the tanks in advance — is the only workable option.

Disposal route	Delta-v	Result
Re-orbit to graveyard	~11 m/s	Parked above GEO; remains for millions of years
Deorbit to re-entry	~1,500 m/s	Burns up in the atmosphere — but needs 100× more fuel, so impractical from GEO

How high is a graveyard orbit? The IADC formula

The Inter-Agency Space Debris Coordination Committee (IADC) sets the standard: raise a retired GEO satellite by a minimum ΔH = 235 + 1000 · C_R · A/m kilometres. The fixed 235 km combines the 200 km upper edge of the protected GEO region with a 35 km margin for luni-solar and gravitational drift; the second term accounts for solar radiation pressure, which depends on the craft's reflectivity (C_R) and area-to-mass ratio (A/m). For a typical satellite this comes to roughly 300 km above the belt, and the disposal orbit is kept near-circular — eccentricity of 0.003 or less — so it never sags back into traffic.

A parking space, not a cleanup

A graveyard orbit takes a dead satellite out of the working GEO ring, but not out of space. At this altitude there is effectively no atmospheric drag, so a passivated craft will circle the Earth for millions of years, and the disposal band slowly fills with spent hardware. That is why disposal contrasts with low Earth orbit, where the 25-year rule pushes operators to re-enter the atmosphere instead. Keeping the geostationary belt sustainable over the long term may ultimately require active debris removal to thin the graveyard population and lower the risk of a collision cascade.

Frequently Asked Questions

How far above GEO is the graveyard orbit? ▼

The IADC recommends raising a retired satellite at least ~235 km above the geostationary belt, which for a typical spacecraft works out to roughly 300 km above the 35,786 km GEO altitude. The exact minimum adds a margin for solar radiation pressure — the gentle push of sunlight — that scales with the satellite's reflectivity and area-to-mass ratio. The disposal orbit is kept near-circular so it never drifts back down into the operational region.

Why are satellites moved to a graveyard orbit instead of being deorbited? ▼

Because deorbiting a satellite from geostationary orbit is prohibitively expensive in propellant. Dropping into the atmosphere from 35,786 km needs about 1,500 m/s of delta-v, whereas boosting into the graveyard needs only ~11 m/s — roughly three months of station-keeping fuel. A satellite simply cannot carry enough propellant to deorbit from GEO, so the small upward nudge is the only practical disposal route.

Do satellites in a graveyard orbit ever come back down? ▼

No — at graveyard altitude there is virtually no atmospheric drag, so a disposed satellite will remain in orbit for millions of years rather than re-entering. This is the trade-off of the method: it clears the working GEO ring cheaply but parks the hardware permanently. That is why spent craft are passivated to stop them exploding, and why the long-term sustainability of GEO may eventually depend on active debris removal.

Is a graveyard orbit the same as a supersynchronous orbit? ▼

A GEO graveyard orbit is a type of supersynchronous orbit — meaning it sits above the geosynchronous altitude, giving an orbital period slightly longer than one day. The terms overlap but are not identical: 'supersynchronous' describes any orbit higher than geosynchronous, while 'graveyard' (or 'disposal') orbit specifically refers to the band used to store retired spacecraft clear of the operational belt.

What happens to a satellite once it reaches the graveyard orbit? ▼

Once in the disposal orbit the satellite is passivated: its remaining propellant is vented, pressure vessels are relieved, and batteries are discharged and disconnected. This removes the stored energy that could otherwise trigger an explosion and scatter debris across the region. The craft is then left inert — no longer manoeuvring or transmitting — drifting silently a few hundred kilometres above the satellites still in service.

Sources & References

Definitions are reviewed against primary sources. Last reviewed: 2026-08-24.