Wed Jan 01 14:04:54 UTC 2025: ## ISRO Successfully Completes First Space Docking Experiment, Paving Way for Chandrayaan-4
**Sriharikota, India (January 2, 2025)** – The Indian Space Research Organisation (ISRO) has successfully launched its first Space Docking Experiment (SpaDeX), a crucial step towards its ambitious Chandrayaan-4 mission to retrieve lunar soil samples. On December 30th, 2024, a Polar Satellite Launch Vehicle (PSLV) deployed two 220kg satellites which are expected to dock on or around January 7th. This successful maneuver demonstrates ISRO’s mastery of a critical technology for future missions.
The SpaDeX mission serves as a precursor to Chandrayaan-4, which will utilize a more complex docking procedure involving multiple modules launched on two separate Launch Vehicle Mark-3 (LVM-3) rockets. These modules will perform a series of docking and undocking maneuvers in space before returning a 3kg lunar soil sample to Earth. ISRO Chairman S. Somanath highlighted the significance of this technology for future endeavors, including the planned Bharatiya Antariksh Station (BAS) by 2035 and future crewed lunar missions.
Chandrayaan-4’s mission architecture involves two LVM-3 launches carrying a transfer/reentry module pair and a descent/ascent module pair. These will dock in geosynchronous transfer orbit before proceeding to the moon. The descent module will collect the soil sample, then dock with the ascent module for the return journey to Earth. The entire process involves intricate orbital mechanics and precise speed adjustments, according to former ISRO associate director B.R. Guruprasad. ISRO anticipates a busy 2025, with plans for four GSLV, three PSLV, and one SSLV launches. The successful SpaDeX mission marks a significant stride toward realizing these ambitious goals.
First Piper 