Space Debris Mitigation Activities at ESA
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1 Space Debris Mitigation Activities at ESA Heiner Klinkrad ESA Space Debris Office H. Klinkrad, ESA, Feb 2011, page 1
2 Space Debris Environment in ,765 launches and 251 on-orbit break-ups led to 16,200 objects in the US Space Surveillance Network (SSN) catalog by Dec launches in mass on orbit ~6,700 tons catalog orbital distribution: low Earth orbits 77%; near-geostationary orbits 6%; highly eccentric orbits 10%; other orbits (incl. GNSS) 7% catalog composition: 20% satellites (only ~6% operational), 11% rocket bodies, 5% mission-related objects, and 64% fragments (41% before the FengYun 1C ASAT test and the collision between Cosmos-2251 and Iridium 33) consequences of recent in-orbit engagements/collisions: FengYun 1C (11 Jan. 2007) 3,040 cataloged fragments; Iridium-33/C-2251 (10 Feb. 2009) 1961 cataloged fragments H. Klinkrad, ESA, Feb 2011, page 2
3 History of On-Orbit Space Objects Iridium-33/ Cosmos-2251 FengYun 1C H. Klinkrad, ESA, Feb 2011, page 3
4 ESA Collision Event Statistics for 2010 conjunction event screening process at ESA: screened ESA satellites: Envisat, ERS-2, CryoSat-2 conjunction event screening performed with regard to all US SSN catalog objects; daily forecasts are performed automatically, on a 24/7 basis avoidance maneuver criteria: collision probability exceeds 1 in 1,000; maneuver must be based on actionable orbit data (i.e. JSpOC or ESA orbit determinations with information on related uncertainties) conjunction event statistics for the year 2010: 5 events exceeded a collision probability of 1 in 1,000 (4 for Envisat, 1 for ERS-2); 49 events exceeded a collision probability of 1 in 10,000 (43 for Envisat; 4 for ERS-2; 2 for Cryosat-2); near-miss events: 8 at < 100m, 22 at < 200m, 40 at < 300m, 70 at < 400m, and 104 at < 500m conjunctor objects: 19% spacecraft, 4% orbital stages, 3% mission-related objects, and 75% fragmentation debris (25% Cosmos-2251, 20% Iridium- 33, 14% FengYun 1C, 11% rocket bodies, 5% other spacecraft) repeated close conjunctions: 118 conjunctions of Cryosat-2 with KITSAT; 98 conjunctions of Cryosat-2 with SwissCube avoidance maneuvers: 9 in total (4 for Envisat, 4 for ERS-2, 1 for Cryosat-2) H. Klinkrad, ESA, Feb 2011, page 4
5 Recent High-Risk Conjunction for Envisat conjunction of Envisat (02-009A) with an Iridium 33 fragment (97-051AA): predicted conjunctions on Dec. 01, 2010, at 20:01 21:41 23:41 UTC, at a total distance of 757m 47m 794m, with a radial separation of 63m +25m +66m (based on JSpOC CSM data & ESA Envisat data) Envisat: max. dimension 26m; Iridium fragment: max. dimension ~0.2m collision probability at t 2d: 1 in 49 (highest so far at maneuver decision time) a two-burn avoidance maneuver (2 1.5 cm/s) between the 1 st and 2 nd, and after the 3 rd conjunction increased the min. separation to 160m (100m radial) H. Klinkrad, ESA, Feb 2011, page 5
6 GEO Satellite Retirements in 2010* GEO disposal statistics compiled by ESA with inputs from the USA, Russia, national space agencies, and commercial operators 11 satellites were re-orbited according to IADC Guidelines TDRS-1 (83-026B, USA) disposal at 357 km x 515 km above GEO Satcom C-3 (92-060B, USA) disposal at 826 km x 1056 km above GEO Thaicom 1 (93-078B, Thailand) disposal at 302 km x 317 km above GEO Brazilsat B1 (94-049A, Brazil) disposal at 282 km x 298 km above GEO PAS 4 (95-040A, USA) disposal at 803 km x 1011 km above GEO Nahuel 1A (97-002B, Argentina) disposal at 241 km x 265 km above GEO * BSAT-1A (97-016B, Japan) disposal at 309 km x 345 km above GEO Intelsat VIII F-2 (97-031A, Int.) disposal at 500 km x 738 km above GEO Eutelsat W2 (98-056A, Eut.) disposal at 281 km x 294 km above GEO Insat 4CR (07-037A, India) disposal at 275 km x 299 km above GEO Rascom QAF 1 (07-063A, Mauritius) disposal at 313 km x 372 km above GEO * Nahuel 1A might marginally penetrate the 200 km zone within a 100-year prediction time span H. Klinkrad, ESA, Feb 2011, page 6
7 GEO Satellite Retirements in 2010 (cont d) 4 satellites were re-orbited too low (within GEO ± 200 km) Thaicom 2 (94-065B, Thailand) disposal at 192 km x 198 km above GEO Galaxy 9 (96-033A, USA) disposal at 178 km x 242 km above GEO Insat 2E (99-016A, India) disposal at 147 km x 205 km above GEO Yamal-100 No.2 (99-047B, Russia) disposal at 71 km x 95 km above GEO 1 satellites were left in the GEO protected region (GEO ± 200 km) Turksat 3 (96-040B, Turkey) left in libration around L1 (75 E) 2 satellites started to librate around L1 (within GEO ± 200 km) Cosmos-2240 (08-033A, Russia) identified by KIAM as being active Beidou DW2 (Compass G2) (09-018A) operational status uncertain Galaxy 15 (05-041A, USA) was in libration around L2 after a contingency; the spacecraft was recovered in Dec and it is now back under control 1 orbital stage was left crossing the GEO protected region (GEO ± 200 km) Delta 4 2 nd stage (10-063B) 33,857km x 35,673km (87km penetration) H. Klinkrad, ESA, Feb 2011, page 7
8 Orbit Control Status of GEO Object in ,274 objects were in or near the GEO ring in Dec satellites were retired; 24 satellites and 2 stages were newly inserted 397 satellites are orbit-controlled (266 of them in E-W and N-S) * based on US SSN catalog data, ESA s DISCOS Database, and KIAM/ISON data H. Klinkrad, ESA, Feb 2011, page 8
9 GEO End-of-Life Disposal History Total Left at L (14.5%) Left at L (5.1%) Left at L 1 /L (2.2%) Drift orbit (too low) Drift orbit (compliant) (29.6%) (48.6%) Annual Total (100%) compliance with IADC GEO end-of-life re-orbiting guidelines has improved during the past 12 years (from ~30% to ~60%) averaged over 12 years, 48.6% of the retired GEO spacecraft were properly re-orbited, 29.6% were insufficiently re-orbited, and 21.8% were abandonned in the GEO ring H. Klinkrad, ESA, Feb 2011, page 9
10 Orbit Control Status vs. Satellite Age H. Klinkrad, ESA, Feb 2011, page 10
11 Conclusions within 3 years the risk of catastrophic collisions for ESA satellites in low Earth orbits has increased twofold; evasive maneuvers for ESA satellites increased to 9 per year, with up to 4 per spacecraft the ratio of IADC compliant vs. non-compliant GEO disposals has improved from 1/3 to 2/3 over the past 12 years (with more room for improvement); ESA s Classification of Geosynchronous Objects, Issue 13, will be released in March 2011; electronic copies can be requested from tim.flohrer@esa.int routine, operational surveillance and tracking capabilities are mandatory to maintain a reliable, actionable space situational awareness (SSA) picture; ESA has started to develop corresponding capabilities as part of a European SSA preparatory program space debris mitigation is a necessary, but insufficient step to maintain a sustainable use of outer space; it must soon be accompanied by space debris environment remediation (mass removal), particularly in the LEO regime; ESA supports the UNCOPUOS WG on the Long-term Sustainability of Outer Space Activities H. Klinkrad, ESA, Feb 2011, page 11
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