He said the next major event was slated for September 2.
Mr Sivan said: "On September 7, the lander will land on the moon. The rover will then start from the lander and at 4 am, the rover will touch the surface", he said.
"Looking at what happened to the soft landing around the world, we are saying that the soft landing success rate is only about 27 per cent". Everything that led up to today has been done before.
"The landing will be a terrifying moment for us".
The craft, which comprises three parts - an orbiter, a lander and a rover - used an on-board propulsion system to complete the tricky operation.
Students wave Indian national flags as the Indian Space Research Organisation's (ISRO) Chandrayaan-2 (Moon Chariot 2), with on board the Geosynchronous Satellite Launch Vehicle (GSLV-mark III-M1), has been launched in Sriharikota in the state of Andhra Pradesh on July 22, 2019. The Lander would have to decrease its velocity from 6km/second to zero in a controlled, but autonomous manner.
To adjust its orbit around the moon, Chandrayaan-2 will perform four more engine burns so that its speed and altitude can be adjusted. The next lunar-bound orbit manoeuvre is slated for Wednesday afternoon.
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This manoeuvre increased the apogee, or the point on the orbit farthest from Earth, to 418,000km. The next manoeuvre in the lunar orbit is on August 28, the space agency said.
A rover will study permanently shadowed moon craters that are thought to contain 100 million tons of water, deposits that were confirmed by India's Chandrayaan-1 mission in 2008.
The spacecraft and its scientific payload will soon get to work gradually lowering and adjusting its orbit through a series of four orbital maneuvers, until it reaches a final polar orbit circularized roughly 100 km (62 miles) above the lunar surface. The next crucial step would be performed on September 2, when Lander Vikram would separate from the orbiter.
The next three days are expected to be taken up for health and systems checks.
During the process of descent, the camera on the body of the lander will take pictures of the lunar surface.
Sivan also said that an invitation has been extended to Prime Minister Narendra Modi to witness the landing. For the answer, everyone has to wait fingers crossed until 7th September. This mission will make India the fourth country after the US, Russia, and China to carry out a soft landing on the moon.