15 terrifying minutes for Chandrayaan 2 starts at 1.40 am on September 7

A series of orbit-lowering manoeuvres in the next few days will bring the orbiter into a 100X100 Km altitude orbit from pole to pole.

Published: 20th August 2019 09:37 PM  |   Last Updated: 20th August 2019 09:37 PM   |  A+A-

Chandrayaan 2

Chandrayaan 2 (Photo | ISRO website)

By Express News Service

BENGALURU: India's unmanned moon landing mission finally made it to the lunar orbit on Tuesday at 9.02 am. 

The LOI manoeuvre was performed successfully today morning using the onboard propulsion system for a firing duration of about 29 minutes. This manoeuvre precisely injected Chandrayaan-2 into an orbit around the Moon.”  Dr K Sivan, Chairman, ISRO  said in an interaction with media persons.

The satellite is located in a lunar orbit with a distance of about 114 km at perilune (nearest point to the Moon) and 18,072 km at apolune (farthest point to the Moon), he added.

A series of orbit-lowering manoeuvres in the next few days will bring the orbiter into a 100X100 Km altitude orbit from pole to pole.  Sivan said We will have four more lunar burns.

READ| 'Our heart was almost stopping': ISRO Chief on Chandrayaan 2 manoeuvre into lunar orbit

"One at 1 pm on August 21, three more on August 28, August 30  and September 1. By this process, the orbit of Chandrayaan2 will be reduced from 18,000 km to a 100X100km circular orbit around the moon by September 1," he said.

Likening the events of September 2, to that of a bridegroom leaving his house, Sivan said, the lander will be separated from the orbiter.  

The attention of the team which was on the propulsion system so far, will also shift to the lander, as it separates from the orbiter. 

After confirming the normalcy of the system will be checked on the following day. "On September 3,  a small deorbit manoeuvre will be held for about 3 seconds to ensure all systems are normal," he said. 

Then, on September 4,  the real deorbit manoeuvre will be held for about 6.5 seconds, he said. With this, the lander will be put in the orbit of 35 km perilune and 97 km apolune.

The following three days, parametres of the lander will be checked to ensure the system is perfectly alright, Sivan added.

On September 7, at 1.40 am a powered decent will start, and in next 15 minutes at 1.55 AM, the lander will land at the site at 71 degrees south of the equator (of the moon)  between two craters called  Manzinus C and Simpelius N.

After landing on the lunar surface, two hours later, a ramp in the lander will touch the ground. About three hours and 15 minutes the rover will start to move from the lander. And at four hours, the lander will touch moons surface, he described the process.

A 90-degree orbital inclination of Chandrayaan-2 necessary to the mission was achieved with the precise execution of both the Trans Lunar Injection, performed on August 14, and LOI manoeuvre held on Tuesday.

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