ISRO Successfully Docks Satellites, Enters Elite Club

ISRO has successfully docked two satellites in space, making India the fourth country to achieve this milestone after the US, Russia, and China. Part of the SpaDeX mission, the docking showcases ISRO's autonomous satellite docking capability, crucial for future missions like Chandrayaan-4.

Shivam Published On January 16th, 2025

The Indian Space Research Organisation (ISRO) has successfully docked two satellites in space, marking India as the fourth country to achieve this feat after the United States, Russia, and China. The docking process, part of the SpaDeX (Space Docking Exercise) mission, demonstrates ISRO’s capability to conduct autonomous satellite docking. This milestone is critical for future missions like Chandrayaan-4 and the planned Bharatiya Antariksh Station.

Key Details of the SpaDeX Mission

Launch Date: December 30, 2024.
Satellites: SDX01 (Chaser) and SDX02 (Target).
Objective: Demonstrate autonomous docking technology.
Initial Distance: 20 km between satellites, gradually reduced for docking.
Docking Milestone: Achieved after overcoming technical issues and two postponements.

Timeline and Events

December 30, 2024: Launch of SpaDeX satellites by PSLV.
January 7 and 9, 2025: Scheduled docking postponed due to technical issues.
January 12, 2025: Successful trial to reduce satellite distance to 3 meters.
January 16, 2025: Final successful docking announced.

Future Applications

Chandrayaan-4: Will involve docking and undocking of lunar modules.
Bharatiya Antariksh Station: Docking capabilities essential for assembling modules in space by 2028.
Human Moon Mission: Docking technology to support lunar exploration by 2040.

Docking Procedure

Gradual approach: 20 km → 5 km → 1.5 km → 500 m → 225 m → 15 m → 3 m.
Final docking achieved under controlled conditions.
Post-docking tests: Power transfer between satellites and separation for independent payload operation.

Summary/Static	Details
Why in the news?	ISRO Successfully Docks Satellites, Enters Elite Club
Satellites	SDX01 (Chaser), SDX02 (Target)
Purpose	Demonstrate autonomous docking technology
Docking Schedule	Initially January 7, postponed to January 9, successfully docked on January 16
Technical Challenges	Postponements due to validation and technical issues
Significance	Supports Chandrayaan-4, Bharatiya Antariksh Station, and future human Moon missions
Docking Process	Gradual distance reduction from 20 km to 3 m, followed by docking and power transfer tests
Future Plans	Space station assembly by 2028, Chandrayaan-4 lunar sample return, human Moon mission by 2040
India Enters Elite List of	United States, Russia, and China