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Orbital Debris Challenges for Space Operations

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Orbital Debris Challenges for Space Operations National Aeronautics and Space Administration Orbital Debris Challenges for Space Operations J.-C. Liou, PhD NASA Chief Scientist for Orbital Debris The Second ICAO / UNOOSA Symposium Abu Dhabi, United Arab Emirates, 15-17 March 2016 National Aeronautics and Space Administration Presentation Outline • Historical and Current Orbital Debris Environment • Danger of Orbital Debris • Orbital Debris Mitigation Policy 2/12 JCL National Aeronautics and Space Administration What is Orbital Debris? • Orbital debris is any human-made object in orbit about the Earth that no longer serves any useful purpose Objects in the Near-Earth Environment R/Bs, S/C Breakup Fragments Mission-related Debris NaK Orbital Debris Al2O3 Al2O3 (slag) Paint Flakes MLI Pieces Meteoroids 10 m 100 m 1 mm 1 cm 10 cm 1 m 10 m Size (diameter) 3/12 JCL National Aeronautics and Space Administration The Near-Earth Space Environment • Only objects in the U.S. satellite catalog (~10 cm and larger) are shown • Sizes of the dots are not to scale 4/12 JCL National Aeronautics and Space Administration How Much Debris is Currently Up There? Softball size or larger (≥10 cm): ~23,000 (tracked by the U.S. Joint Space Operations Center, JSpOC) Marble size or larger (≥1 cm): ~500,000 Dot or larger (≥1 mm): >100,000,000 (a grain of salt) • Due to high impact speed in space (~10 km/sec in LEO), even sub-millimeter debris pose a realistic threat to human spaceflight and robotic missions 10 km/sec = 22,000 miles per hour (the speed of a bullet ~1,500 miles per hour) 5-mm aluminum sphere @ 7 km/sec could penetrate a 2.54-cm thick aluminum wall • Total mass: >7000 tons LEO-to-GEO (~2700 tons in LEO) 5/12 JCL • • National Aeronautics and SpaceAdministration National Aeronautics owners/operators around the world the owners/operators around JSpOC conjunction conducts assessments andprovideswarningstoallsatellite and maintains most oftheir orbi The U.S.JointSpaceOperations Center Number of Objects 10000 12000 14000 16000 18000 2000 4000 6000 8000 0 Evolution oftheCataloged Population 1957 1959 1961 1963 Rocket Bodies Rocket Debris Mission-related Spacecraft Debris Fragmentation Total Objects 1965 1967 1969 1971 1973 1975 ts intheU.S.SatelliteCatalog 1977 1979 Collision of Cosmos 2251 and Iridium 33 and 2251 Cosmos Collision of 1981 6/12 1983 (JSpOC)istracking~23,000large objects 1985 1987 Destruction of Fengyun-1C 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 2009 ~1300 areoperational 2011 2013 2015 JCL • National Aeronautics and SpaceAdministration National Aeronautics 7000 metrictons The materialmassinEarth orbitcontinuestoincreaseandhasexceeded Mass in Orbit (millions of kg) 0 1 2 3 4 5 6 7 8 1957 1959 Mass in Near-Earth SpaceContinues Mass in 1961 1963 1965 Mission-related Debris Mission-related Fragmentation Debris Rocket Bodies Spacecraft Total Objects 1967 1969 1971 1973 1975 1977 to Increase 1979 1981 1983 7/12 1985 1987 1989 1991 1993 1995 No signofslowingdown! 1997 1999 2001 2003 2005 2007 2009 2011 2013 2015 JCL National Aeronautics and Space Administration Threat from Orbital Debris • The threat from orbital debris is real – The gravity-gradient boom of an operational French satellite (CERISE) was cut in half by a tracked debris fragment in 1996 – The fully operational Iridium 33 was destroyed by a retired Russian satellite (Cosmos 2251) in 2009 – Near the end of the Space Shuttle Program, the Loss of Crew and Vehicle risks from MMOD impact damage were in the range of 1 in 250 to 1 in 300 per mission (OD to MM ~2:1 at ISS altitude) – Impacts by small, untracked debris could be responsible for many satellite anomalies • A 17-cm Russian retro reflector, Ball Lens In The Space (BLITS), was damaged and shed a piece of trackable debris in January 2013 BLITS CERISE 8/12 JCL National Aeronautics and Space Administration Robotic Spacecraft Collision Avoidance Maneuvers • Since 2007 NASA has required frequent satellite conjunction assessments for all of its maneuverable spacecraft in LEO and GEO to avoid accidental collisions with objects tracked by JSpOC • NASA also assists other U.S. government and foreign spacecraft owners with conjunction assessments and subsequent maneuvers • During 2015 NASA executed or assisted in the execution of 26 collision avoidance maneuvers by robotic spacecraft 9/12 JCL National Aeronautics and Space Administration ISS Collision Avoidance Maneuvers • The International Space Station (ISS) conducted 4 debris collision avoidance maneuvers in 2015 • In addition, due to a late notification of a high probability conjunction, the crew was directed to “shelter-in-Soyuz” on July 16th – Fortunately the conjunction did not lead to a collision 10/12 JCL National Aeronautics and Space Administration U.S. Government Orbital Debris Mitigation Policy and Standard Practices • NASA was the first organization to develop orbital debris mitigation policy and guidelines in the 1990s • NASA and the Department of Defense (DOD) led the effort to establish the U.S. Government Orbital Debris Mitigation Standard Practices (approved in 2001) • The U.S. National Space Policy of 2006 and 2010 directs agencies and departments to implement the U.S. Government Orbital Debris Mitigation Standard Practices – Control of debris released during normal operations – Minimizing debris generated by accidental explosions – Selection of safe flight profile and operational configuration – Postmission disposal of space structures 11/12 JCL National Aeronautics and Space Administration International Orbital Debris Mitigation • Many major spacefaring nations have established orbital debris mitigation policies similar to the U.S. Government Orbital Debris Mitigation Standard Practices • The Inter-Agency Space Debris Coordination Committee (IADC) established the first consensus on international orbital debris mitigation guidelines in 2002 – IADC members: ASI, CNES, CNSA, CSA, DLR, ESA, ISRO, JAXA, KARI, NASA, ROSCOSMOS, SSAU, and UKSA • The United Nations adopted a similar set of space debris mitigation guidelines in 2007 • The international space community needs to follow the existing mitigation guidelines to better preserve the near- Earth space environment for future space operations 12/12 JCL.
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