Extra brake thrust may have sent Vikram out of control in home stretch
BENGALURU: When silence descended on the Isro mission control and millions of Indian homes minutes before Vikram was to touch down on the Moon at 1.53am on Saturday, many thought the lander had too little thrust to brake to a halt. A day later, Isro scientists are looking at whether Vikram had too much braking thrust, which spun it out of control.
"We thought one of the thrusters may have underperformed," said an Isro scientist. "But after some preliminary analysis, it looks like a thruster overperformed."
Descending from its orbit 30km from the Moon, Vikram had achieved perfect roughbraking for 10 minutes, reducing its velocity from 1,680 metres per second to 146 metres per second. Soon after the fine-braking that signalled Vikram's last 5km descent to the Moon, mission control lost contact with the lander.
译文来源：三泰虎 http://www.santaihu.com/48388.html 译者：Jessica.Wu
Dilip • Victoria • 6 hours ago
Every failure is a lesson to perfection.
Arjun Prabhu • 5 hours ago
Every failure is a stepping stone to success !. I am sure our scientists will use this experience for much greater success
Dean • traveller • 6 hours ago
I am no scientist, but a question aries why we lost contact? brakes can send the vehicle out of control. but loss of communication?
Hats off to the effort. Thats it !! ISRO Well Done.
Aim high to challenge yourself
Sanmesh p• vadodara
USA (12 Attempts) Russia (7 Attempts) & China (Attempts)
India’s First Attempt is 95% Successful !!!
Proud of our ISRO Scientists
nanksn • Planet earth
ISRO''s track record is much better than that of many advanced countries..and they shall overcome this also asap.
Anwar Hussain Indian• 5 hours ago
Learn from the mistakes, let's do it again guys. I love ISRO.
Aam aadmi• 1 hour ago
We can we will
Dilip De • 5 hours ago
What caused the signal loss? It is a mystery. I hope no sabotage is there.
Rajeev Goel• 4 hours ago
This is the second time in as many years that the mission got aborted because of communication failure. Our geo satellite was lost because of last minute signal loss. Is this jamming of signals by China that resulted in this fiasco.
Murti Kavuri • Hyderabad • 28 mins ago
Few advises from a scientist for future programs
- No politicians to attend ISRO during mussion. They distract the jobs.
- No publicity till the mission is over.
3.no media to be entertained during mission.
ARUP MALLIK• 22 mins ago
This is a thought set of advises. I also subscribe this and am sure many Indians feel the same.
Gurcharn Sandhu • 1 hour ago
Loss of communication implies extensive damage to the lander Vikram. Normally such extensive damage could only be expected if Vikram had crash-landed on the moon. But ISRO has reported the Lander to be still 2.1 km above the moon surface at the time of communication loss. It is just possible that there may be a flaw in the instant to instant height calculation software. Lander may have reached the moon surface at high speed and crashed when the computation software still showed a distance of 2.1 km to the moon surface. It needs to be investigated.
Ajay Gupta• 47 mins ago
Your guess makes a good sense buddy. I also think so.
ONE LINE CHALLENGER• 1 hour ago
Excellent point. Who wrote the code? Infy? Or TCS?
S Suri • NA • 2 hours ago
Person responsible for controlling the thrust knew pm modi was watching from the gallery. Maybe he got nervous at a crucial moment. No VIPs should be allowed in delicate operations.
Robert Samuel chandrasekaran• 2 hours ago
Not a failure.so far so good.This is a learning curve.70 percent of moon landing is a failure according to NASA.So let us not get disheartened.
Ishaq• idupula paya • 2 hours ago
when Modi consoled by hugging, Dr.Sivan,yesterday, I, got the same feeling as if a father is consoling his failed child in an exam.
We are fortunate to have a statesman and a leader like Modi ji.
Deviprasad Nayak • 1 hour ago
India is not doing any Fake Missions like US did in 1969 when Americans landed on Moon.
shakcrazy1• 1 hour ago
how u know bro....r u from moon
Luminary • Bangalore • 1 hour ago
Don''t celebrate before success. Don''t create hype when you have critical missions which can go either way. Success and failure are common in these cases.
K Mohan • Hyderabad • 4 hours ago
Let the orbiter find out where is Vikaram lander
Freiburg • 2 hours ago
Sad. Monkkkkey Modi should do his Job at PMO. Scientist''s attention was diverted by Monkkkkey Modi jumping around.
Kamasuthra • Kamasuthra • Kerala • 6 hours ago
Everything perfect till Modi landed.
patel Sunny • 2 hours ago
kiran • 58 mins ago
This failure is steppstepping stone for tomorrow''s success
Anil • 1 hour ago
ISRO our pride