rover Pragyan lost contact, As the Lunar night starts to fall early Saturday, hopes of re-establishing a connection with India’s moon mission Chandrayaan-2’s
Vikram lander appears to be all but over with its 14-day mission life on to the end.
On September 7, Lander Vikram, with rover Pragyan, lost touch with the ground station during its final drop, just 2.1 km above the lunar surface, minutes before the intended arrival on the Moon.
A former official of the Indian Space Research Organisation (ISRO) recommended that keeping the technology simple;
stopping the mission profile and not turning it till the last moment; taking out the simulation experiments to the possible summit level are some of the education from the crash arrival of India’s moon lander Vikram.
Talking to IANS, the official said, “Space technology itself is sophisticated, rover pragyan lost contact
and one should not add more complexities to it as it had arrived with the lander Vikram.
For example, the four throttleable motors to work in unison is a unique challenge. Then there is the 5th engine at the centre.”
According to the ex-official, had it been recognised earlier that the GSLV-Mk III (Geosynchronous Satellite Launch Vehicle) rocket was ready for the mission,
the probe could have been designed with a tremendous single-engine, and not with five drivers.
“Ideally a moon lander of this kind-should have a single 3,500 Newton (N) engine. This would have stopped the complexities of maintaining the four throttleable engines running in a union. Other nations had done a powerful single-engine while settling their works on the Moon. Before the arrival on the lunar surface, the single-engine would be cut off, and the lander would have made a smooth landing,” he replied.
According to him, the charge profile supported last-minute changes and changed from the new plan.
“Originally the plan was to start the Chandrayaan-2 satellite along with the lander working GSLV-Mk II that can carry a load of two tonnes,” he replied.
After the fifth engine combined centre lander to stop dust Moon surface scratching lander it tries to land, he said.
“This, in turn, built the spacecraft’s power and developed the other terms that GSLV-Mk II was not able of carrying. It was then determined to launch Chandrayaan-2 with higher capacity GSLV-Mk III,” he more added.
Initially, the idea was to turn off all the four throttleable engines first and allow the lander to gradually dropdown. “The idea was to provide the lander to drop down from a maximum of 10 metres at 2 metres per second,” he continued.
“After the fifth motor was started, there was a software change. How well it was examined is not known,” he replied.
“The ISRO has to assume various things and situations with the data on hand.
It should also check and copy what were the steps that were not done and the issues that they should assume,”
another retired official, who favoured to remain anonymous, told IANS.