Developed in collaboration with the European Space Agency (ESA), Proba-3 represents a groundbreaking mission in space exploration. The spacecraft is uniquely designed to conduct precision formation flying, with two satellites traveling in tandem just 150 metres apart.

The mission’s primary objective is to observe the Sun’s corona – its outer atmosphere – which plays a crucial role in determining space weather. The innovative approach involves one satellite (the Occulter) creating an eclipse-like phenomenon by blocking the sun’s center, allowing the Coronagraph satellite to capture detailed observations of the sun’s outer rim.

ISRO Chairman Shri S. Somnath highlighted the mission’s success, stating that the PSLV-C59 has been placed in a highly elliptical orbit ranging from approximately 600 km at its closest point to earth (perigee) to 60,000 km at its farthest point (apogee).

The name Proba, which means “let’s try” in Latin and stands for “Project for Onboard Anatomy,” aptly captures the experimental nature of this collaborative effort between ISRO and ESA. The mission not only contributes to India’s advancing space capabilities but also represents a significant step forward in heliophysics research.

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The orbit of Vikram Lander is 104 km x 128 km. Chandrayaan-2 Orbiter continues to orbit the Moon in the existing orbit and both the Orbiter and Lander are healthy. The next de-orbiting manoeuvre is scheduled for Wednesday between 3.30 and 4.30 am (IST).The separation of the Vikram Lander from Chandrayaan-2 Orbiter took place on Monday at 13.15 pm (IST). 

The health of the Orbiter and Lander is being monitored from the Mission Operations Complex (MOX) at ISRO Telemetry, Tracking and Command Network (ISTRAC) in Bengaluru with support from Indian Deep Space Network (IDSN) antennas at Bylalu, near Bengaluru. All the systems of Chandrayaan-2 Orbiter and Lander are healthy.

As per the tentative plan, the powered descent will occur on September 7 followed by the Vikram Touch Down on the same day between 1.30 pm and 2.30 pm.The last manoeuvre of Chandrayaan 2 happened on Sunday evening. ISRO chairman Dr K Sivan has noted that the limits of the orbiter, lander, rover are in good condition.

It may be recalled that the fourth Lunar bound orbit manoeuvre for Chandrayaan-2 was performed successfully on Friday using the onboard propulsion system of the spacecraft. The duration of the manoeuvre was 1155 seconds.

Chandrayaan 2 was launched from Satish Dhawan space centre in Sriharikota in Andhra Pradesh by India`s heavy-lift rocket Geosynchronous Satellite Launch Vehicle-Mark III (GSLV Mk III) on July 22. The successful launch was carried out exactly a week after the ISRO had aborted the launch on July 15, just 56 minutes before the launch due to a “technical snag”.The mission includes four components: a GSLV Mk-III, an orbiter, a lander; and the small rover.

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