ISRO SpaDeX Mission Postponed For The Third Time, Here's Why

The Indian Space Research Organisation (ISRO) encountered a challenge with its Space Docking Experiment (SPADEX) mission. Despite nearing success, the docking attempt was halted. ISRO had managed to reduce the gap between two satellites from 15 meters to just 3 meters. However, they decided to separate them for further analysis before trying again.

Today marked the third attempt at docking, following two previous postponements. The complex task of bringing two satellites together in space is known as space docking. This latest effort began shortly after midnight, employing a slow drift technique that reduced the distance between the satellites to 15 meters. At this point, ISRO indicated that the satellites were ready to meet.

Challenges Faced During Docking

During an earlier attempt on January 9, the satellites were initially 230 meters apart. Unexpected drift forced another delay. As today's distance shrank to 15 meters early in the morning, hopes soared across India for a successful docking. The satellites stayed in position for some time, capturing images and videos of each other.

However, when trying to close the gap further from 15 to 3 meters, complications arose. This led to both satellites being moved safely apart. In previous attempts, excessive drift posed challenges. For successful docking, perfect alignment is crucial; even minor directional deviations can jeopardize the process.

Technical Issues and Safety Measures

ISRO scientists managed to stabilize the drift at zero degrees but faced delays in receiving signals from a critical sensor. Sources at ISRO noted an issue with the proximity and docking sensor essential for successful docking. For safety reasons, onboard systems automatically move satellites apart if disturbances occur. This scenario unfolded today.

A detailed assessment is currently underway to address the problem with the proximity and docking sensor. The next attempt will only proceed once this issue is resolved. According to ISRO officials, both satellites are expected to pass over ISRO's ground station later this evening, offering another potential opportunity for docking.

Future Prospects for SPADEX Mission

If problems persist, they may have to wait for another chance. Sources revealed that after two days, visibility of both satellites from India's ground station will be lost. This could push the next opportunity until March.

The SPADEX mission remains a significant endeavour for ISRO despite these setbacks.