Countdown to launch of PSLV-C62 mission begins

PSLV-C62 / EOS-N1 Mission — UPSC Study Note

1. At a Glance

• PSLV-C62/EOS-N1 was ISRO's launch vehicle mission scheduled for 12 January 2026, carrying a strategic earth observation satellite (EOS-N1) and 15 co-passenger satellites. [1]
• It marked the 105th launch from Sriharikota, the 64th PSLV flight, and the 5th flight of the PSLV-DL variant. [1][2]
• The mission was a commercial mission of NewSpace India Limited (NSIL), signalling India's expanding commercial space ecosystem. [1]
• Critical because it demonstrates India's dual-use (strategic + commercial) space capability and tests emerging elements like on-orbit PS4 re-ignition and a re-entry capsule (KID). [2]

2. Why in the News

• On 11 January 2026, ISRO commenced the 22.5-hour countdown at Satish Dhawan Space Centre (SDSC-SHAR), Sriharikota for a 10:17 a.m. IST, 12 January 2026 liftoff. [1]
• The mission attracted attention owing to its strategic payload (EOS-N1), multi-national co-passengers from startups and universities, and a novel KID Capsule re-entry demonstration. [1][2]
• Post-launch, the mission suffered a failure during the third stage (a roll-rate deviation just before stage separation), making it a landmark event for ISRO's failure analysis processes. [3]

3. Background & Evolution

• PSLV (Polar Satellite Launch Vehicle) first flew in 1993 (PSLV-D1, which failed); first successful flight in 1994 (PSLV-D2). [3]
• PSLV has become India's most reliable workhorse launcher, with missions spanning remote sensing, navigation (IRNSS), and interplanetary probes (Chandrayaan-1, Mars Orbiter Mission). [3]
• PSLV-DL variant (twin strap-on configuration) introduced to carry medium payloads; PSLV-C62 was its 5th flight. [1][2]
• NewSpace India Limited (NSIL) was incorporated in March 2019 as ISRO's commercial arm under the Department of Space to commercialise space activities. [2]
• Earth Observation Satellite (EOS) series replaced the earlier IRS (Indian Remote Sensing) naming convention, with EOS-01 (2020), EOS-02, EOS-04, EOS-06 as predecessors. [3]
• PSLV-C61 (EOS-09), the preceding mission, was the 101st launch from Sriharikota (2025), establishing sequential context. [4]

4. Core Static Facts

5. Multi-Dimensional Analysis

Scientific / Technological

• PSLV-DL uses two Liquid Strap-On (LSM) stages providing intermediate lift capacity, suitable for medium-class payloads like EOS-N1. [2]
• PS4 re-ignition manoeuvre — after payload injection, the 4th stage (PS4) is re-started to perform a controlled de-boost, placing both PS4 and the KID Capsule on a re-entry trajectory, reducing space debris contribution. [1][2]
• KID Capsule (likely a Spanish/European re-entry demonstrator) represents ISRO's growing role in hosting technology demonstrators for international partners. [1]
• Mission failure due to roll-rate anomaly at third-stage separation underscores that stage-separation dynamics remain a critical failure point in multi-stage vehicles. [3]

Geopolitical / Strategic

• EOS-N1 designated as strategic — implying use by defence/intelligence agencies, reinforcing India's indigenously-built surveillance satellite capability. [1]
• Hosting overseas commercial co-passengers strengthens India's position in the global small satellite launch market, competing with SpaceX Transporter missions and ISRO's own PSLV-C37 (record 104 satellites, 2017). [3]
• NSIL's commercial model aligns with IN-SPACe (Indian National Space Promotion and Authorisation Centre) framework created under Space Activities Policy 2017 and the Indian Space Policy 2023. [2]

Economic

• NSIL earns foreign exchange by launching international co-passengers; each PSLV commercial mission contributes to India's space economy target of $44 billion by 2033 (IN-SPACe projection). [2]
• Participation of Indian startups as co-passenger developers reflects the ecosystem created by liberalisation under the Indian Space Policy 2023. [2]

Environmental

• The PS4 de-boost manoeuvre addresses growing concerns over orbital debris in Sun Synchronous Orbit — one of the most congested orbital regimes. [2]
• Re-entry of spent stages rather than leaving them as space junk aligns with IADC (Inter-Agency Space Debris Coordination Committee) guidelines. [2]

Administrative / Governance

• NSIL operates as a Government of India company under Department of Space, bridging ISRO's technology with commercial market needs. [2]
• IN-SPACe acts as regulator and promoter for private sector participation; NSIL acts as commercial executor.

6. Recent Developments (last 12–18 months)

• May 2025 — PSLV-C61 / EOS-09: 101st launch from Sriharikota; carried a radar imaging satellite. [4]
• 2025 — Indian Space Policy 2023 implementation: IN-SPACe began granting authorisations to private launch vehicle companies (Agnikul Cosmos, Skyroot Aerospace). [2]
• 11 January 2026: 22.5-hour countdown for PSLV-C62 begins at SDSC-SHAR. [1]
• 12 January 2026: PSLV-C62 lifts off; fails during third-stage burn due to roll-rate anomaly; EOS-N1 not injected into intended orbit. [3]
• KID Capsule: Successfully separated and transmitted flight data despite launch failure. [3]

7. Prelims Hooks

1. PSLV-C62 was the 105th launch from Satish Dhawan Space Centre, Sriharikota. [1]
2. 64th flight of the PSLV overall. [1]
3. 5th mission of the PSLV-DL (Dual Strap-on Liquid) variant. [1][2]
4. Launch scheduled from the First Launch Pad (FLP), not the Second Launch Pad. [1]
5. Primary payload EOS-N1 is an Earth Observation Satellite built for strategic purposes. [1]
6. Mission operated as a commercial mission of NSIL (NewSpace India Limited), not directly ISRO. [1]
7. EOS-N1 and 14 co-passengers targeted Sun Synchronous Orbit (SSO); KID Capsule targeted a re-entry trajectory. [1]
8. PS4 (fourth stage) of PSLV was re-ignited post-payload injection to de-boost — a debris-mitigation measure. [1][2]
9. NSIL was incorporated in March 2019 under the Department of Space. [2]
10. The 22.5-hour countdown commenced on Sunday, 11 January 2026. [1]
11. Mission failed due to roll-rate anomaly during third-stage operation, just before stage separation. [3]
12. PSLV-DL variant uses two strap-on liquid motors (distinguishable from PSLV-G with 6 solid strap-ons, PSLV-XL with 6 larger strap-ons, PSLV-CA with none). [2]
13. Sriharikota is located in Andhra Pradesh (not Tamil Nadu — common error). [1]
14. The co-passenger KID Capsule is a re-entry demonstrator (Spanish/European), surviving the failure to transmit data. [3]

8. Mains Relevance

GS Paper III — Science & Technology; Space Technology; Indigenisation of Technology; Government Policies.

Specific syllabus headings:

• "Awareness in the fields of IT, Space, Computers, Robotics, Nano-technology, Bio-technology…"
• "Achievements of Indians in Science & Technology; indigenisation of technology and developing new technology."

Plausible Mains Questions:

1. "The commercialisation of India's space sector through NSIL and IN-SPACe represents a paradigm shift. Examine the institutional mechanisms and challenges involved." (GS-III, 250 words)
2. "Evaluate the significance of debris-mitigation measures adopted in PSLV missions in the context of long-term sustainability of outer space activities." (GS-III, 150 words)
3. "How does the EOS series of satellites serve India's dual-use (civilian and strategic) objectives? Discuss with recent examples." (GS-III, 200 words)

9. Related Topics to Study Next

10. Common Errors / Trap Areas

1. Sriharikota location: Often confused as Tamil Nadu — it is in Sri Potti Sriramulu Nellore district, Andhra Pradesh. The Pulicat Lake separates it from Tamil Nadu.
2. NSIL vs ISRO: PSLV-C62 is a NSIL commercial mission, not a purely government ISRO mission — examiners may test whether aspirants know the distinction.
3. PSLV-DL vs PSLV-XL: PSLV-DL has 2 liquid strap-ons; PSLV-XL has 6 larger solid strap-ons. Confusing the two is a classic trap.
4. EOS-N1 orbit: The primary payload goes to SSO, not Geostationary (GEO) or Low Earth Orbit (LEO) generically — precision matters in matching questions.
5. Mission count confusion: "105th launch from Sriharikota" ≠ "64th PSLV flight" ≠ "5th PSLV-DL flight" — these are three distinct counters; MCQs test each independently.
6. Department of Space vs Ministry: There is no Ministry of Space — the Department of Space reports directly to the Prime Minister's Office; NSIL operates under it.