Even though the Indian Space Agency ISRO (ISRO) suffered a setback in the Chandrayaan-2 mission, it had lost contact with Vikram Lander. But, ISRO scientists are still trying to contact Vikram. Now, along with ISRO, the US space agency NASA is also helping ISRO. But, meanwhile, former director of ISRO’s Space Application Center Ahmedabad and Adjunct Professor of IIT Kharagpur, Tapan Mishra explained what could be the three major reasons for the deterioration of the mission. Professor Tapan Mishra explained in a phased manner on his social media account how the landing may have gone wrong and where attention was needed.
Come … now know that Prof. What are the three big reasons Tapan Mishra gave
1. The thrusters should not start at the right time
he Vikram lander was traveling at a speed of 1.66 km per second at an altitude of 30 km above the lunar surface. When he had to land on the lunar surface, then Vikram Lander had to be upright and his speed should be 2 meters per second. Vikram Lander has five big thrusters. Which would help him in landing? With the help of these thrusters, Vikram Lander also made rounds of the moon. Apart from these, there are 8 small thrusters on Vikram Lander. Thrusters are like small rockets that help propel an object forward or backward.
Five big thrusters were engaged under Vikram. Four thrusters in four corners and one in the middle. These would help to take Vikram up and down. Whereas, 8 small thrusters would help in Vikram’s direction. It may be that at an altitude of 400 meters above the lunar surface, all the big thrusters do not have fuel simultaneously. It would have happened that not all the thrusters started simultaneously. The result is that the lander must have moved quickly and lost balance. At this time the lander must be moving in the same way as the sparkling fireworks on Diwali.
2. Have not reached the engine at the right time and right amount of fuel
The bulk of the Vikram lander is a fuel tank. Due to the high speed of the lander, braking, the fuel must be bouncing in its tank in the same way as water bounces in the water tub. Due to this, fuel would not have reached the engine nozzle properly. Because of this, there may be a disturbance in the landing due to the lack of full fuel to the thrusters at the time of landing. Vikram Lander’s speed was 1.66 km / s (6000 km / h) and 60 m / s (200 km / h) incoming from a height of 30 km to a height of 400 meters. The direction of the lander was also vertical from horizontal. The four thrusters at the corners were working throughout this time while the middle thruster was off.
The direction of the lander became vertical at an altitude of 400 meters. Two of the four lower thrusters were turned off and two smaller side-mounted thrusters were turned on so that Vikram could hover like a helicopter while coming down and find the right place for landing. But nowhere did any thruster support Vikram. This must-have happened because the fuel did not reach all the working thrusters simultaneously.
3. Vikram could not fight with the gravity of the moon
Vikram Lander cruised like a helicopter at a height of 100 meters from the lunar surface. Small thrusters on the side were on to tolerate the moon’s gravitational force. The lander’s camera searches for the landing place and then descends. The picture taken with the camera matches the picture stored in the onboard computer. After this, Vikram Lander stopped hovering and slowly shut down four big thrusters and came down with the help of middle fifth thruster. At this time, the radar altimeter in the Vikram lander takes care of the height of the lander. Since the landing was fully automatic, it could not be controlled from the earth. Here, gravity could not be detected by Vikram Lander, because there is a change in the effect of gravity there.