Chandrayaan-2 – Last moments of Vikram landing – Orbiter spotted Vikram

0

Just a communication lost cannot conclude anything and it has a reason behind it. Read further to know more.

The target of the Mission

The mission of the Chandrayaan – 2 has the two main target accomplishments which revolve around the moon which is called orbiter and the lander which moves with the controlled navigation on the surface of the moon.

Here, the two main components are the orbiter and the lander. At present data, the orbiter is functioning to its best level.

The orbiter has enough fuel in which it can complete the cycle of 7 earth years. However,  it will take continuous high-resolution photos of the moon throughout the year.

The final moments of the Vikram

Crores of people are waiting for the soft landing of Vikram and the set time to land the Vikram is at 1:55 AM. But later the time was changed to 1:53 AM.

Even after the past of 1:53 AM the lander position was not known due to the signal loss between the orbiter and the lander.

Reasons for the signal loss

  • It might crash-land.
  • The angle of lander exceeded more than 15 degrees and it turned upside down.
  • It might soft-land but the communication is lost.
  • At last moments the thruster didn’t work properly which is responsible to maneuver the lander.

The journey of the Vikram lander

The total journey of the lander from the separation is 30 KMS to reach the surface of the moon.

Unfortunately at the last moments, with an altitude of 2.1 KMS, the connection was lost and it could not re-connect it till now.

Only 69 seconds left from the actual set time of 1:53 AM for the lander to make a soft landing on the moon.

Later, ISRO chief said that the final decision can be concluded only when the data is analyzed.

Also said that the mission had accomplished 95 percent of its decided plan making not less than a success. Even the lander had completed major phases and the connection got lost in the last and important phase.

Finding the lander – The trajectory of the Vikram

We do learn from our mistakes and the experience, and now it is very much crucial to know the actual reason of losing communication.

Only then, scientists can able to know the cause of this scenario.

The Vikram is placed into the orbiter and it should leave the orbiter when it comes close to the moon. Then the Vikram should follow the path of trajectory as shown in the graph.

However, the gravity on the moon is quite less compared to the earth, but the 1,470 Kilogram lander can crash easily if it is set to free fall.

To avoid this, ISRO attached 4 – Liquid thrusters to guide the lander and make the landing soft and the thruster can control the speed and the fall of the lander.

The phases of the Vikram

There is a total of 4 phases decided by the ISRO to land the Vikram.

1st phase of Vikram

In the first phase, Vikram should come from 30KM orbit to an altitude of 7.4 KMS from the moon surface. This maneuver had successfully completed by the ISRO within 10 minutes.

2nd phase of the Vikram

In this phase, Vikram should come down from 7.4 KMS to 5 KMS and this has been completed in 32 seconds.

3rd phase of the Vikram

In this step, Vikram should take 89 seconds to complete this phase and unfortunately, the connection has been lost at this stage and the position of the lander is unknown.

If the landing is as per the plan, Prgyaan the rover should come out from the lander and it will start its journey on the moon for 14 days to explore it. This should be happening when the lander goes as per plan.

Here, The red line is the decided path of ISRO in which the lander should follow. The green line states the position of the lander. 

Clearly, you can see the Greenline deviates from its path at the final phase and acting like a free-fall body, soon after the communication has lost.

The orbiter will find Vikram in 3 days

The orbiter has the technology of “The dual-band synthetic aperture radar (SAR) onboard” by which it can penetrate and have a proper look up to the 10 meters of the surface of the moon which can easily find water and ICE.

Having known that Orbiter can capture the surface of the moon crystal clear and it can also capture the position and the status of the Vikram.

But orbiter takes 3 days to reach the same position where the Vikram trajectory has accomplished. Within 3 days, we can easily track the position and status of the lander.

Orbiter finally found Vikram – The lander

It’s quite clear that Orbiter will find the Vikram’s position and that’s what happened now.

K Sivan, Chairman of ISRO said on September -8 that, the lander Vikram was found on the surface of the moon and they are trying to establish contact between with the lander.

However, it is still unknown that the lander is in intact in the right position or else it is crashed on the surface of the moon. It is said that the lander is 500 meters apart from the