Chandrayaan-2: ISRO to simulate varied scenarios to find why Vikram lander failed

Agencies
September 14, 2019

Bengaluru, Sept 14: The Indian space agency will simulate various scenarios, including what it has not done and what it had assumed, to arrive at the probable cause of its moon lander Vikram hitting the lunar surface after veering away from its plotted path and losing communication link with ground stations, a retired senior ISRO official said.

Early on September 7, Vikram, while on its descent to soft land on the Moon's south polar region, apparently lost control and crash-landed there, snapping the communication links.

"The Indian Space Research Organisation (ISRO) has to simulate various things and scenarios with the data on hand. It should also check and simulate what the actions that were not done and the results that they had assumed," the retired official, who preferred to remain anonymous, told IANS.

According to him, ISRO has to see whether any simulation prior to the launch was overlooked or waived any known deviation.

"ISRO should also check out to the extent at which various failure modes were simulated. ISRO has to go into these details. It would take considerable time to arrive at a conclusion," he added.

Space experts had told IANS that normally any data loss from a satellite means it suddenly changed its attitude. The loss of communication link means the target /satellite experienced a large angular rotation.

According to them, the loss of communication link could also be due to wrong input being loaded on to the lander.

In other words, the loss of communication link with Vikram could be due to sudden disturbance - in the form of engine propulsion or wrong data input, experts said.

A former official classified the Chandrayaan-2 mission into four parts: putting the Chandrayaan-2 spacecraft into earth orbit; taking it into the moon orbit; soft landing of the lander Vikram; and rover Pragyan rolling down to carry out scientific experiments.

"Out of the four, the first two were successful and the last two have not happened," he said.

He said ISRO would have got various engineering data from this mission which will be useful for the future course of action.

On July 22, the Rs 978 crore Chandrayaan-2 was launched into the space by India's heavy lift rocket Geosynchronous Satellite Launch Vehicle-Mark III (GSLV Mk III) in a textbook style.

The Chandrayaan-2 spacecraft comprised three segments -- the Orbiter (weighing 2,379 kg, eight payloads), 'Vikram' (1,471 kg, four payloads) and 'Pragyan' (27 kg, two payloads).

After five earth-bound orbit raising activities, Chandrayaan-2 was inserted into the lunar orbit. On September 2, Vikram separated from the orbiter.

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News Network
April 25,2024

Bengaluru, Apr 25: Former union minister C M Ibrahim, who was expelled from Janata Dal (Secular) for protesting against party’s alliance with BJP, has stressed on need for a third front not just at the national level, but also in Karnataka. 

Addressing a news conference in Bengaluru on Wednesday, he said he’s planning to form a third front in Karnataka along with Lingayat Seer Dingaleshwar Swami.

Ibrahim said that he will tour the state between April 27 and May 4 and that he would meet Dingaleshwar Swami on April 29. “There is a need for the third front in this country. We will try to establish a third front in association with the seer and we hope we will be successful in those efforts,” he said.

Expressing disappointment with the Congress for not doing enough to gain the full confidence of Muslims, Ibrahim said that Congress is concentrating only on certain communities for votes, and ignoring Muslims. 

“The Congress is not even caring for Muslims and Dalit votes. In some Muslim areas they did not even hold campaigns seeking votes and trying to convince the communities which never vote in their favour. I fear this may lead to low turnout and Congress may lose its vote base,” he opined.

Mentioning about guarantees on which Congress is strongly relying during this election, Ibrahim said, such things won’t work all the time. “Guarantees will not work anymore. Every election you need to give something new to the voters,” he added.

On Prime Minister Narendra Modi’s statement that Congress is trying to appease minorities for votes, Ibrahim requested both Congress and BJP parties not bring Muslims between them. “I request both parties. Leave us alone. Don’t make us sandwiches for your political sake. We are living with peace and hope even the Prime Minister will understand this,” Ibrahim added.

Launching a broadside against Prime Minister Deve Gowda, Ibrahim said, “Deve Gowda has sold his personality itself. Whatever I have told about JD(S) has come true. I pity, a former Prime Minister should not have come to this stage,” he said. 

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News Network
April 25,2024

Bengaluru: Karnataka State Natural Disaster Monitoring Centre (KSNDMC) has issued a series of animated shorts in Kannada advising people of appropriate measures to take during extreme temperatures to keep oneself safe.

 “Karnataka has not seen such extreme temperatures and heat waves in the recent past. So, we wanted to ensure a wider reach for safety measures, therefore we decided to issue them in a reader-friendly format,” said an official from KSNDMC.

Meteorological Centre Bengaluru, Indian Meteorological Department, had issued a five-day heat wave warning, lasting till April orange alert, for parts of Karnataka.

“In places like Bagalkote, Vijayapura, Kalaburgi, Yadgir, Raichur, Koppal, Ballari, Tumkur, Mandya, Gadag, Davangere and Chitradurga, the temperature is likely to touch 40 degrees Celsius tomorrow,” said C P Patil, director of the centre.

On April 25, these places recorded a maximum temperature of 39 degrees Celsius.

Orange alert would mean increased likelihood of heat illness symptoms in people who are exposed to sun for a prolonged period of time as well as those who do heavy manual work.

According to Patil, coastal Karnataka will also have very hot and humid weather conditions, making it very uncomfortable for people there.

“It’s best for children and old people to avoid exposure to heat in coastal areas too,” added Patil.

In places where heat wave is predicted, people are advised to avoid direct exposure to sunlight between 12 noon and 3pm.

“When they go out, it is best to use protective goggles, an umbrella or a hat. Also aerated drinks must be avoided since they cause dehydration. Best to drink water as much as possible, even if you don’t feel thirsty,” said M Rajavel, head of LACD, Meteorological Centre, Bengaluru.

People are also advised not to leave the children or pets inside parked vehicles.

The maximum and minimum temperatures of Bengaluru are very likely to be around 37 degree Celsius and 23 degree Celsius respectively for the next 48 hours, said Patil.

Hassan recorded the highest jump from its normal minimum temperature. It recorded 22.6 degrees Celsius, about 2.8 degrees more than usual.

According to IMD, on April 29 light rain is also very likely in isolated places over Bidar, Kalaburgi, Yadgir, Vijayapura, Chikkamagaluru, Hassan, Kodagu, Mysuru, Mandya and Chitradurga districts.

On April 30, light rain is predicted again for Bidar, Kalaburgi, Yadgir, Vijayapura, Raichur, Koppal, Ballari, Chikkamagaluru, Tumkur, Chikkaballapura, Bengaluru Rural, Bengaluru Urban and Kodagu districts.

Incidentally, KSNDMC has also issued a series of animated advisory for lightning safety.

“We also update temperature every 15 minutes in our X handle in coordination with IMD,” added the KSNDMC official.

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News Network
May 3,2024

boat.jpg

Mangaluru: The passenger vessel service between Lakshadweep and Mangaluru has recommenced operations with the arrival of Parali, a high-speed craft, at the Old Mangaluru Port on Thursday, May 2 

With 160 passengers on board, along with a pilot, a ship engineer, an assistant, and eight labourers, the arrival of the vessel brings hopes of reinstating this vital transportation link.

The passengers were welcomed by Congress brass. The vessels that used to arrive before the Covid-19 pandemic took 13 hours to reach Mangaluru from Lakshadweep. However, the introduction of the high-speed craft, Parali, has reduced the travel time to approximately seven hours, said Abubakar Ashraf Bengre.

Bengre is part of a team that has been instrumental in liaising with the authorities of both Lakshadweep and Karnataka to facilitate the revival of this service. He told reporters that the service would bring better economic activity to Mangaluru. 

Over recent months, discussions have been held with Hamdullah Sayeed, president, Lakshadweep Congress Committee, as well as Karnataka Speaker UT Khader and district minister Dinesh Gundu Rao, to garner support for the reintroduction of the service.

The passengers who arrived mostly sought medical treatment, went shopping or met relatives here. They said that they traveled for Rs 450. Former MLA J R Lobo said that they will urge the government to ensure regular vessel services continue.

The passenger service was discontinued due to a lack of demand, it is learnt. In the year 2018-19, 4,955 passengers embarked and 7,422 disembarked from the Old Mangaluru Port. Subsequently, the figures declined to 3,779 (embarked) and 2,294 (disembarked) in 2019-20. The numbers further plummeted to 561 (embarked) and 19 (disembarked) in 2020-21, leading to the suspension of the service.

At present, the administration of the Union Territory of Lakshadweep has released a schedule for high-speed craft movement from April 29 to May 5.

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