Space environment

Statistics

Nearly seventy years of orbital trends: object growth, launch activity, shell occupancy, inclination structure, constellation expansion and fragmentation events. All charts are rendered client-side from the modelled catalogue and a reference historical series.

—Objects in orbit (2026)Reference annual series

—PayloadsActive + defunct spacecraft

—Rocket bodiesSpent upper & lower stages

—Fragments & other debrisAggregate of PF/PD/RF/RD/UI classes

—Growth, last decadeTotal catalogued objects

—Launch attempts, 2026Year to date

Three scopes, kept separate

This page mixes an annual reference series (a smooth reconstruction of the historical population through 2026), the modelled daily catalogue (the same 34,000-object set the tracker renders), and derived indicators computed from that catalogue. Their totals and category definitions are not interchangeable — a payload in the reference series is not counted the same way as a payload in the modelled catalogue.

Objects in Earth orbit, 1957–2026 ?An annual reference reconstruction, not a snapshot of the modelled catalogue. Category boundaries follow ESA DISCOS conventions: payloads, rocket bodies, and an aggregate of mission-related objects, fragmentation debris and unidentified objects.

Stacked by class. Note the step changes in 2007, 2009 and 2021.

Payloads Rocket bodies Debris & fragments

Orbital launch attempts per year

Cadence roughly tripled between 2018 and 2025.

LEO shell occupancy

Peak shell: — with — objects.

Inclination distribution

Spikes at 53° (Starlink), 63.4° (Molniya), 86–99° (polar / SSO).

Objects entering the catalogue by year

Modelled catalogue, by year of first entry.

Population by orbital regime

Modelled catalogue.

Population by object class

Modelled catalogue.

Constellation payloads

— objects — — of all modelled payloads.

Largest fragmentation events ?Fragment counts are the modelled cloud sizes used to populate the tracker, chosen to be comparable to the catalogued counts of the corresponding real events.

Red = ASAT test, orange = collision, purple = breakup.

Perigee and apogee, sampled LEO population

Each pair of points is one object. Tight bands are circular constellation shells; vertical spread indicates eccentric transfer or decaying orbits.

Apogee Perigee

Congestion by regime

Spatial flux indicator F = ρ·v_rel·σ, where ρ is objects per km³ in the shell, v_rel is a regime-typical relative velocity (10 km/s LEO, 5 MEO, 0.5 GEO, 7 HEO) and σ = 10 m². The ratio column is normalised to the LEO 800–1,000 km band.

Regime	Objects	Density (km⁻³)	Flux F	Ratio to LEO	Label

Structural breaks matter. In a real environment series, changes in catalogue policy — stale-epoch retention windows, decay filtering, the definition of an "active" object — produce steps that look like physical events but are not. Any time you compare two orbital population plots, check that they share a catalogue definition before drawing a conclusion.