ISRO's Space Debris Mitigation Drive: 20 of 22 Indian Satellites at Elevated Collision Risk in Low Earth Orbit

Why in News

The Union Government has informed Parliament that 20 of India's 22 active satellites operate in Low Earth Orbit (LEO), the orbital band most severely affected by the global space debris crisis. Union Minister of State for Space, Dr Jitendra Singh, disclosed in a written reply to the Lok Sabha (18 March 2026) that India's satellites face heightened collision risks due to rapidly expanding mega-constellations and the accumulation of orbital debris. ISRO has executed 9 Collision Avoidance Manoeuvres (CAMs) in 2026 alone — on top of 20 in 2025 — and is accelerating its indigenous space situational awareness infrastructure through the NETRA project and the Debris-Free Space Mission (DFSM).

Background

Space debris — comprising defunct satellites, spent rocket stages, fragmented spacecraft parts, and paint flecks — has accumulated in Earth orbit since the dawn of the space age in 1957. The European Space Agency (ESA) estimates that there are over 43,000 objects larger than 10 centimetres in orbit, with an additional 1.2 million untrackable fragments between 1 and 10 cm. LEO — the band between roughly 160 km and 2,000 km altitude — has become particularly congested owing to the rapid deployment of commercial mega-constellations by operators such as SpaceX (Starlink) and OneWeb.

The concept of the Kessler Syndrome, first proposed by NASA scientist Donald Kessler in 1978, describes a cascade scenario where collisions generate more debris, which in turn causes more collisions, potentially rendering certain orbital bands unusable for decades. LEO collision risk has risen 20% since 2024 alone, according to government disclosures.

India's Space Debris Footprint

India has contributed to the debris problem. Its most significant debris-generating event was Mission Shakti (March 2019), India's first Anti-Satellite (ASAT) weapon test, which destroyed the Microsat-R satellite in LEO. The government described it as a "debris-minimising" test because of its low altitude, allowing fragments to naturally decay within weeks. As of March 2026, India tracks 129 pieces of orbital debris originating from its own missions.

Current Developments

Collision Avoidance Manoeuvres

ISRO executed 20 CAMs in 2025 (after evaluating over 150,000 close approach alerts) and 9 more in 2026 to protect operational Indian satellites. Each CAM requires precise orbital calculations and fuel expenditure — a finite resource that limits satellite lifetimes.

NETRA: India's Space Situational Awareness Infrastructure

The NETRA project (Network for Space Objects Tracking and Analysis) is India's indigenous space situational awareness initiative with a sanctioned budget of ₹509.01 crore (₹67.77 crore expended as of February 2026). NETRA includes an optical telescope at Hanle, Ladakh, capable of detecting objects as small as 30 centimetres at geostationary altitude (GEO), significantly reducing India's dependence on foreign tracking data from agencies such as the US Space Surveillance Network (SSN).

Complementing NETRA is the MOTR (Multi-Object Tracking Radar) at Sriharikota, which operationally tracks larger LEO debris objects.

Debris-Free Space Mission (DFSM)

In 2024, India announced the Debris-Free Space Mission (DFSM), committing all government and private Indian space actors to zero debris generation. The mission includes plans for Active Debris Removal (ADR) — physically capturing and de-orbiting defunct objects — a capability currently being developed internationally.

Key Facts

Constitutional Provisions

• Article 246 + Seventh Schedule, List I, Entry 40: Works, lands, and buildings vested in or in the possession of the Union — Parliament has exclusive legislative power over national space infrastructure including ISRO facilities.
• Article 53 read with Article 73: Executive power of the Union extends to all matters on which Parliament may legislate; space activities fall within the Union's executive domain.
• Article 51(c): Directive Principle directing the State to foster respect for international law and treaty obligations — applies to India's obligations under the Outer Space Treaty, Liability Convention, and IADC guidelines.

Legal Framework

• Outer Space Treaty, 1967: India is a signatory. Article VI holds states internationally responsible for all national activities in outer space — including those of private operators. Article IX requires consultation before activities that could cause "harmful interference."
• Liability Convention, 1972 (Convention on International Liability for Damage Caused by Space Objects): Establishes absolute liability for damage caused on Earth's surface or to aircraft; fault-based liability for damage in outer space. Relevant when India's debris damages other states' satellites.
• Registration Convention, 1975: Requires states to register space objects with the UN Secretary-General; India complies, helping attribute debris to source states.
• India Space Policy 2023: Released in April 2023; formalises IN-SPACe as the independent regulator for commercial space activities; mandates debris mitigation compliance for all licensed operators.
• Space Activities Bill (Draft, pending): Proposed domestic legislation to govern commercial space operations, liability, and debris compliance — not yet enacted as of August 2026.

Institutional Framework

• ISRO (Indian Space Research Organisation): India's national space agency; responsible for operational satellites, CAMs, debris tracking, and the NETRA and DFSM programmes.
• IN-SPACe (Indian National Space Promotion and Authorisation Centre): Independent regulatory body overseeing commercial space activities; has formulated third-party liability guidelines.
• NewSpace India Limited (NSIL): Commercial arm of ISRO; executes commercial satellite launches and must comply with DFSM norms.
• Department of Space: Under the Prime Minister's Office; oversees ISRO, IN-SPACe, and NSIL; nodal department for India Space Policy 2023.
• IADC (Inter-Agency Space Debris Coordination Committee): International forum of 13 space agencies (including ISRO, NASA, ESA, JAXA) that developed space debris mitigation guidelines. India actively contributed to the revised IADC guidelines.
• UN Committee on the Peaceful Uses of Outer Space (COPUOS): India participates actively; Working Group on Long-Term Sustainability has adopted guidelines that include debris mitigation standards.

Economic Dimensions

India's space economy is valued at approximately USD 8.4 billion (2023) and is projected to reach USD 44 billion by 2033 (IN-SPACe estimates). Satellite collision and debris damage pose direct financial risks. A single satellite loss — costing USD 100–500 million — can disrupt communication, navigation (NavIC), Earth observation (EOS series), and meteorological services.

The commercial space sector — now open to private players under India Space Policy 2023 — faces liability and insurance premium risks from debris. Global satellite insurance markets already factor in LEO congestion risk in premium pricing. India's DFSM and debris mitigation compliance will influence the bankability of Indian commercial launch services in global markets.

Banking & financial angle: SEBI-regulated space sector entities and NBFCs financing space startups must account for debris-related liability provisions. Foreign investors evaluating India's space sector — under the liberalised FDI norms for space (up to 74% under automatic route for satellite manufacturing) — consider regulatory robustness, including debris liability frameworks, as a key due-diligence factor.

Environmental Dimensions

Space debris is increasingly recognised as an environmental problem extending beyond Earth's atmosphere. Defunct satellites and rocket bodies re-entering the atmosphere burn up, depositing metallic particulates in the stratosphere that may affect the ozone layer and contribute to radiative forcing — a concern flagged by researchers and UNEP. The long-term sustainability of LEO is itself an environmental resource management challenge, analogous to the management of global commons such as the high seas and the atmosphere.

International Relations

• India–USA: India relies partly on the US Space Surveillance Network for debris tracking data. The NETRA project is designed to reduce this dependence and build bilateral space situational awareness sharing on equal terms.
• India at COPUOS: India co-authored several long-term sustainability guidelines, positioning itself as a responsible space-faring nation rather than merely a debris contributor.
• APSCO and bilateral agreements: India has debris data-sharing arrangements with select partner agencies under bilateral space cooperation agreements.
• Mega-constellation friction: SpaceX's Starlink (owned by a US company) and other commercial constellations are major contributors to LEO congestion. India has raised concerns through COPUOS; the lack of a binding international regime for commercial constellation management remains a global governance gap.

Challenges

• No binding global debris law: The Outer Space Treaty and IADC guidelines are voluntary; states are not legally compelled to comply with debris mitigation standards.
• Mega-constellation growth: SpaceX alone plans to deploy up to 42,000 Starlink satellites; this volume will dramatically increase close-approach frequency for all LEO operators including ISRO.
• Active Debris Removal (ADR): Technology is nascent; no commercially viable, internationally agreed ADR framework exists, raising questions about who bears the cost of removing historic debris.
• Attribution: Identifying which state's debris caused a collision is technically complex and legally contested under the Liability Convention.
• Domestic legislation gap: India's Space Activities Bill remains a draft; private operators lack comprehensive statutory debris compliance obligations until it is enacted.

Government Initiatives

• NETRA Project: Optical telescope at Hanle (Ladakh) + MOTR at Sriharikota for space situational awareness.
• Debris-Free Space Mission (DFSM, 2024): Zero-debris mandate for all Indian government and private space missions; includes ADR roadmap.
• IN-SPACe Liability Guidelines: Framework for third-party damages from Indian space objects, applicable to private operators.
• India Space Policy 2023: Includes debris mitigation compliance as a condition for launch authorisation.
• IADC Contribution: India co-authored revised IADC space debris mitigation guidelines, adopted internationally.

Way Forward

The Parliamentary Standing Committee on Science and Technology has called for expedited passage of the Space Activities Bill to provide a statutory basis for debris compliance. Key recommendations from NITI Aayog's space sector working groups and COPUOS long-term sustainability guidelines include:

• Enact the Space Activities Bill swiftly, incorporating debris liability, insurance mandates, and ADR obligations for private operators.
• Scale up NETRA with additional radar and optical sensors to achieve full LEO coverage independent of foreign data.
• Lead global advocacy at COPUOS for a binding international debris remediation framework with shared cost mechanisms.
• Invest in Active Debris Removal technologies through ISRO-private partnerships under the IN-SPACe framework.
• Establish a National Space Debris Fund — similar to the National Disaster Response Fund — to cover liabilities arising from Indian-origin debris incidents.

Possible Mains Questions

1. "The space debris crisis in Low Earth Orbit represents a 'tragedy of the commons' at a global scale. In the context of India's growing space ambitions, examine the challenges and suggest a comprehensive debris governance framework." (GS III — Science and Technology, 250 words)
2. "India Space Policy 2023 opens the sector to private players. What are the implications for debris management, and how should India's regulatory framework address third-party liability?" (GS III — S&T and Governance, 250 words)

Possible Prelims MCQs

1. How many of India's active satellites are in Low Earth Orbit? (A) 12 (B) 15 (C) 20 (D) 22 — Answer: C
2. The NETRA project's optical telescope is located at: (A) Bengaluru (B) Sriharikota (C) Hanle, Ladakh (D) Pune — Answer: C
3. India's DFSM (Debris-Free Space Mission) aims to achieve: (A) 50% reduction in debris by 2030 (B) Zero debris generation across all missions (C) Removal of all existing debris from LEO (D) Debris sharing with IADC partners — Answer: B
4. The IADC (Inter-Agency Space Debris Coordination Committee) comprises how many space agencies? (A) 5 (B) 9 (C) 13 (D) 21 — Answer: C
5. 'Kessler Syndrome' refers to: (A) A solar storm disrupting GPS satellites (B) A cascade of debris collisions rendering orbits unusable (C) The accumulation of defunct satellites in GEO (D) Re-entry burn-up causing atmospheric pollution — Answer: B

Essay Dimensions

1. The final frontier or the final dump: governing the global commons of outer space.
2. India's space ambitions in a congested orbit — balancing development and responsibility.
3. Mega-constellations and the tragedy of the commons: can international law keep pace with commercial space?
4. Active debris removal: the next great challenge of space technology and international cooperation.
5. From Mission Shakti to DFSM: India's evolving stance on responsible space behaviour.

Interview Questions

1. How does a Collision Avoidance Manoeuvre (CAM) work, and what are its operational trade-offs for a satellite's lifespan?
2. India's Mission Shakti ASAT test was criticised for generating debris. How does the government's DFSM commitment address this contradiction?
3. Why has the Space Activities Bill not been passed despite being in draft for several years? What are the legislative hurdles?
4. What is the difference between the NETRA project's capabilities and the US Space Surveillance Network? Why does India need its own system?
5. How should India position itself at COPUOS to push for a binding debris remediation treaty without constraining its own space ambitions?

FAQ

What is a Collision Avoidance Manoeuvre (CAM)?

A CAM is an orbital adjustment made by a satellite operator to move the satellite away from the predicted trajectory of an approaching debris object or another satellite. ISRO evaluates close approach alerts and executes CAMs when the probability of collision exceeds a threshold, using the satellite's onboard propulsion system.

What is the NETRA project?

NETRA (Network for Space Objects Tracking and Analysis) is India's indigenous space situational awareness initiative, with a sanctioned budget of ₹509.01 crore. It includes an optical telescope at Hanle, Ladakh, capable of detecting objects as small as 30 cm at geostationary altitude, reducing India's dependence on US Space Surveillance Network data.

What is the Debris-Free Space Mission (DFSM)?

Announced in 2024, DFSM commits all Indian government and private space missions to zero debris generation and includes plans for Active Debris Removal (ADR) — physically capturing and de-orbiting defunct satellites and debris.

Is India legally liable for damage caused by its space debris?

Yes. Under the Liability Convention, 1972, India is liable for damages caused by its space objects. India's IN-SPACe has formulated liability guidelines extending this obligation to private commercial operators launching under Indian authorisation.

Further Reading

• ISRO — Official Website: https://www.isro.gov.in
• IN-SPACe — Space Policy 2023: https://www.inspace.gov.in
• IADC Space Debris Mitigation Guidelines: https://www.iadc-home.org
• UN COPUOS Long-Term Sustainability Guidelines: https://www.unoosa.org/oosa/en/ourwork/copuos/lts/index.html