Space Environment Statistics

Environment Report

The latest Space Debris Environment Report issued by ESA's Space Debris Office is available here. The eighth edition has been released on 19/07/2024.

The slides on the Space Capacity concept presented at the ESPI Event "Limited Orbital Environments: Capacity Approaches to Outer Space" (20/04/2022) are available here.

Environment Statistics

Last update: 20 September 2024

Space debris by the numbers

Number of rocket launches since the start of the space age in 1957: About 6740 (excluding failures)
Number of satellites these rocket launches have placed into Earth orbit: About 19590
Number of these still in space: About 13230
Number of these still functioning: About 10200
Number of space objects regularly tracked by Space Surveillance Networks and maintained in their catalogue: About 36860
Estimated number of break-ups, explosions, collisions, or anomalous events resulting in fragmentation: More than 650
Total mass of all space objects in Earth orbit: More than 13000 tonnes
Not all objects are tracked and catalogued. The number of debris objects estimated based on statistical models to be in orbit (MASTER-8, future population 2024): 40500 space debris objects greater than 10 cm
1100000 space debris objects from greater than 1 cm to 10 cm
130 million space debris objects from greater than 1 mm to 1 cm

Extended statistics

Here we would like to briefly address and summarise some facts on the space environment. This environment is understood to contain all man made objects, including fragments and elements thereof, which currently, or previously did, reside in an Earth bound orbit. Of specific interest is space debris, defined as all man made objects including fragments and elements thereof, in Earth orbit or reentering the atmosphere, that are non functional (IADC definition). Objects in the space environment can be categorised in two broad categories: The ones which can be traced back to a launch event and for which the nature can be identified, and the ones for which this is not (yet) possible. The later ones will be identified as Unidentified (UI), whereas the former can be further categorised in:

Payloads (PL), space object designed to perform specific function in space excluding launch functionality. This includes operational satellites as well as calibration objects.
Payload mission related objects (PM), space objects released as space debris which served a purpose for the function of a payload. Common examples include covers for optical instruments or astronaut tools.
Payload fragmentation debris (PF), space objects fragmented or unintentionally released from a payload as space debris for which their genesis can be traced back to a unique event. This class includes objects created when a payload explodes or when it collides with another object.
Payload debris (PD), space objects fragmented or unintentionally released from a payload as space debris for which the genesis is unclear but orbital or physical properties enable a correlation with a source.
Rocket body (RB), space object designed to perform launch related functionality; This includes the various orbital stages of launch vehicles, but not payloads which release smaller payloads themselves.
Rocket mission related objects (RM), space objects intentionally released as space debris which served a purpose for the function of a rocket body. Common examples include shrouds and engines.
Rocket fragmentation debris (RF), space objects fragmented or unintentionally released from a rocket body as space debris for which their genesis can be traced back to a unique event. This class includes objects created when a launch vehicle explodes.
Rocket debris (RD), space objects fragmented or unintentionally released from a rocket body as space debris for which the genesis is unclear but orbital or physical properties enable a correlation with a source.

The taxonomy of objects in the space environment can be done based on type as before, but also via the orbital regime in which they reside. A catalogued object will refer to an object whose orbital elements are maintained for prolonged periods of time in a catalogue created by a space surveillance system. An asserted object will refer to an object which has not been reported by a space surveillance system but is known to exist in the space environment by design. Asserted objects include for example rocket bodies which perform a re-entry burn after inserting a payload into orbit prior to consistent detection or tracking by a space surveillance system. As such catalogued and asserted objects are not mutually exclusive and neither one is strictly contained within the other. Catalogued and asserted objects can be categorised in terms of their orbital elements for a given epoch. Orbital regimes used hereafter will be identified based on semi-major axis, eccentricity, inclination, perigee height and apogee height in the table below.

Orbital regime definitions
Orbital regime	Description	Limits
GEO	Geostationary Orbit	i < 25°, 35586 km < h_p < 35986 km, 35586 km < h_a < 35986 km
IGO	Inclined Geosynchronous Orbit	37948 km < a < 46380 km, e < 0.25, 25° < i < 180°
EGO	Extended Geostationary Orbit	37948 km < a < 46380 km, e < 0.25, i < 25°
NSO	Navigation Satellites Orbit	50° < i < 70°, 18100 km < h_p < 24300 km, 18100 km < h_a < 24300 km
GTO	GEO Transfer Orbit	i < 90°, h_p < 2000 km, 31570 km < h_a < 40002 km
MEO	Medium Earth Orbit	2000 km < h_p < 31570 km, 2000 km < h_a < 31570 km
GHO	GEO-superGEO Crossing Orbits	31570 km < h_p < 40002 km, h_a > 40002 km
LEO	Low Earth Orbit	h_p < 2000 km, h_a < 2000 km
HAO	High Altitude Earth Orbit	h_p > 40002 km, h_a > 40002 km
MGO	MEO-GEO Crossing Orbits	2000 km < h_p < 31570 km, 31570 km < h_a < 40002 km
HEO	Highly Eccentric Earth Orbit	h_p < 31570 km, h_a > 40002 km
LMO	LEO-MEO Crossing Orbits	h_p < 2000 km, 2000 km < h_a < 31570 km
UFO	Undefined Orbit
ESO	Escape Orbits

Fragmentation events are currently being categorised according to the assessed break-up cause:

Accidental: Subsystems which showed design flaws ultimately leading to breakups in some cases.
Aerodynamics: The break-up occurs due to interaction with the Earth's atmosphere, e.g. on Molniya orbits.
Anomalous: Defined as the unplanned separation, usually at low velocity, of one or more detectable objects from a satellite that remains essentially intact.
Collision: There have been four confirmed collision events between catalogued objects so far. Moreover, there were several events reported as anomalies that resulted in several fragments observed on orbits close to the parent satellite in addition to a momentum change for the same satellite. It is likely that in such cases, the satellite suffered a space debris or micro-meteoroid impact.
Deliberate: Satellites were deliberately destroyed in space. There were several reasons for doing this, e.g. to avoid disclosing the design or the testing of anti-satellite weaponry. Propulsion stored energy for non-passivated propulsion-related subsystems, e.g. fuel tanks, might trigger an explosion.
Electrical: Stored energy for non-passivated batteries might lead to an explosion, e.g. due to thermal run-away.
Propulsion: Stored energy for non-passivated propulsion-related subsystems might lead to an explosion, for example due to thermal stress.
Unknown for events that show fragments but additional evidence is missing to support any of the other categories.

Data presented hereafter will only relate to catalogued objects, and hence next to the increase of the space object population by human activity show the increase in availability of space surveillance networks. The abbreviation OCC (Orbit Control Capacity) will be used to identify Payload objects which can alter their orbit by means of applying demonstrated impulsive or continuous thrust. This thus include all conventional types of space propulsion but not technologies exploiting natural perturbations such as drag or solar sails. Rocket bodies, also described as Stages are all assumed to have OCC. Human spaceflight (HS) related missions are analysed separately, as they tend to skew results in terms of mass and count affected for the space environment and have generally a very high reliability. These mission include manned payloads as well as cargo payloads, but not the rocket bodies which bring them into orbit. An in-depth report will be available here soon.

Objects in Orbit

Current number of orbiting objects per type and orbital regime
Orbital Regime	PL	PF	PD	PM	RB	RF	RD	RM	UI	Total
LEO	11266	5307	111	215	949	3425	32	524	587	22416
GEO	799	3	3	8	65	0	0	0	35	913
EGO	536	1	1	50	202	80	4	5	2090	2969
GTO	50	29	1	10	230	193	10	49	662	1234
NSO	286	0	0	1	97	0	0	2	49	435
MEO	72	1	4	49	26	84	1	4	803	1044
LMO	85	132	4	44	249	530	20	215	1082	2361
MGO	71	58	1	3	175	1922	4	0	1591	3825
HEO	29	12	0	2	54	99	0	0	1308	1504
Other	44	0	0	4	6	0	0	0	119	173
Total	13238	5543	125	386	2053	6333	71	799	8326	36874

Current mass (t) in orbit per object type and orbital regime
Orbital Regime	PL	PM	RB	RM	Total
LEO	4817.7	3.4	1428.7	6.4	6256.2
GEO	2644.4	1.0	134.5	0.0	2779.9
EGO	966.7	5.1	387.7	0.3	1359.9
GTO	89.6	1.0	532.2	21.9	644.8
NSO	371.5	0.4	220.0	0.0	591.8
MEO	78.9	0.3	42.2	4.2	125.7
LMO	75.3	6.9	490.0	89.1	661.2
MGO	97.4	1.9	292.7	0.0	392.0
HEO	49.1	0.1	133.1	0.0	182.3
Other	72.7	0.1	14.5	0.0	87.3
Total	9263.2	20.1	3675.7	122.0	13081.1

Current cumulative cross sectional area (m²) in orbit per object type and orbital regime
Orbital Regime	PL	PD	PM	RB	RF	RM	Total
LEO	145387.1	0.0	29.2	10920.1	1.3	254.5	156592.3
GEO	25607.8	23.6	8.4	1462.9	0.0	0.0	27102.7
EGO	12204.3	0.6	38.5	4387.5	0.0	9.7	16640.7
GTO	748.0	0.0	8.8	5302.1	0.0	627.6	6686.6
NSO	3156.0	0.0	0.8	1892.4	0.0	0.0	5049.2
MEO	1073.3	0.0	11.2	438.0	0.0	21.6	1544.2
LMO	715.1	0.0	22.7	5216.3	0.6	1613.4	7568.1
MGO	901.3	0.0	14.7	3170.6	0.0	0.0	4086.6
HEO	672.2	0.0	0.3	1335.0	0.0	0.0	2007.5
Other	472.7	0.0	0.4	135.8	0.0	0.0	608.8
Total	190937.8	24.2	135.0	34260.8	1.9	2526.8	227886.7

Environment Report

Environment Statistics

Space debris by the numbers

Extended statistics

Objects in Orbit

Fragmentations in Orbit

Missions to LEO and GEO

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