Explaining the course of the lunar trajectory, Isro's president, K Sivan, told TOI: "Chandrayaan-2 will take six days to travel the lunar trajectory to reach Moon (lunar orbit) the August 20". The total distance between the Earth and the Moon is 3,84 lakh kilometer.
To place Chandrayaan-2 in the lunar trajectory from the perigee (the point of the orbit when the craft is closest to the Earth), Isro first erected the elliptical orbit of the lunarcraft around the Earth by performing five maneuvers. The fifth maneuver was successfully completed on August 6, when the propulsion system was fired for a duration of 1 041 seconds, following which Isro stated that all lunarcraft parameters were normal. On a mass of 3 850 kg (launch) of Chandrayaan-2, 2,542 kg is just the weight of the fuel.
Upon entering Moon's sphere of influence, Chandrayaan-2's on-board propulsion system will be re-triggered to slow down the craft, allowing it to be captured in a preliminary orbit around Moon.
Through a series of maneuvers, the Chandrayaan-2 orbit around Moon will be circularized at an altitude of 100 km from the lunar surface. "As if we had mounted the Chandrayaan-2 Earth orbit with the help of the propulsion system to drive the craft out of the Earth, we will use the propulsion system to lower the Chandrayaan-2 lunar orbit. We will do five to six maneuvers to reduce its orbit ". Subsequently, Lander 'Vikram', named after the father of the Indian space program Vikram Sarabhai, will separate from the orbiter and enter an orbit of 100 km on 30 km around Moon. When the lander reaches 30 km altitude the 6 September the final descent towards the lunar surface will begin.
The leader of Isro told TOI: "The final descent of 30 km during 15 minutes will be the most terrifying moment for Team Isro, as we will handle this complex operation for the first time. The final descent of Chandrayaan-2, when its thrusters will move in reverse to reduce the speed of the spacecraft, will be fragile. "It will be as if you are holding a newborn baby for the first time," he said.
If the Chandrayaan-2 team, led by Project Director Vanitha, and Mission Director Ritu Karidhal can successfully land at Lunarcraft in the wee hours of September's 7. India will become the fourth country in the world to put its spacecraft on Moon.
After landing, The Pragyan rover housed in Vikram's lander, will come out after four hours and will move at a speed of 1 cm per second. During its lifetime of a lunar day (14 terrestrial days), Pragyan will move 500 meters on the lunar surface, she will take images and analyze Place on the lunar surface and send back the data via Vikram or the orbiter on Earth in the 15 minutes.
While Vikram and Pragyan are going to last a lunar day, the orbiter will continue to tour Moon for over a year, mapping Moon and taking pictures of different regions in search of water and "new science". A passive payload from NASA, Laser retroreflector Array, associated with Vikram, will calculate the distance between the Earth and the Moon and help detect the exact location of the lander on the Moon.
Chandrayaan-2 is responsible for 13 payloads that will make a detailed study of the topography, seismography, identification and distribution of minerals, the chemical composition of the surface, the thermo-physical characteristics of the top layer of the soil and the composition of the tenuous lunar atmosphere, for a new understanding. of the origin and evolution of the moon.
This article appeared first (in English) on THE TIMES OF INDIA