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
December 20,2025

Mangaluru, Dec 20: The Mangaluru City Police have issued a detailed traffic advisory ahead of the inaugural ceremony of Karavali Utsava, which will be held at the Karavali Utsava Ground on Saturday.

The festival will be inaugurated at 6:00 pm by Dakshina Kannada District Minister Dinesh Gundu Rao. Cultural and public programmes will be held at the venue every evening and will continue until January 2.

According to City Police Commissioner Sudheer Kumar Reddy, parking of vehicles is strictly prohibited on both sides of the road from Lalbagh to Karavali Utsava Ground. Visitors are requested to park their vehicles only at designated parking areas.

To help the public, traffic signboards and parking guidance flex boards have been installed along the routes leading to the venue. The police have urged commuters and visitors to follow these instructions to ensure smooth traffic movement.

Designated Parking Locations

•    Urwa Market Ground – Cars
•    Gandhinagar Government School (near Press Club) – Two-wheelers and cars
•    Ladyhill Church parking area – Two-wheelers and cars
•    Canara School Ground, Mannagudda – Two-wheelers and cars
•    Thimmappa Hotel premises – Two-wheelers and cars
•    Scout and Guide Bhavana premises (behind Karavali Utsava Grounds) – Two-wheelers
•    Urwa Market Road – Two-wheelers
•    Hat Hill Road – Two-wheelers

The police have appealed to the public to cooperate by following traffic rules and parking guidelines to avoid inconvenience during the festival.

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News Network
December 16,2025

bengal.jpg

The deletion of over 58 lakh names from West Bengal’s draft electoral rolls following a Special Intensive Revision (SIR) has sparked widespread concern and is likely to deepen political tensions in the poll-bound state.

According to the Election Commission, the revision exercise has identified 24 lakh voters as deceased, 19 lakh as relocated, 12 lakh as missing, and 1.3 lakh as duplicate entries. The draft list, published after the completion of the first phase of SIR, aims to remove errors and duplication from the electoral rolls.

However, the scale of deletions has raised fears that a large number of eligible voters may have been wrongly excluded. The Election Commission has said that individuals whose names are missing can file objections and seek corrections. The final voter list is scheduled to be published in February next year, after which the Assembly election announcement is expected. Notably, the last Special Intensive Revision in Bengal was conducted in 2002.

The development has intensified the political row over the SIR process. Chief Minister Mamata Banerjee and her Trinamool Congress have strongly opposed the exercise, accusing the Centre and the Election Commission of attempting to disenfranchise lakhs of voters ahead of the elections.

Addressing a rally in Krishnanagar earlier this month, Banerjee urged people to protest if their names were removed from the voter list, alleging intimidation during elections and warning of serious consequences if voting rights were taken away.

The BJP, meanwhile, has defended the revision and accused the Trinamool Congress of politicising the issue to protect what it claims is an illegal voter base. Leader of the Opposition Suvendu Adhikari alleged that the ruling party fears losing power due to the removal of deceased, fake, and illegal voters.

The controversy comes amid earlier allegations by the Trinamool Congress that excessive work pressure during the SIR led to the deaths by suicide of some Booth Level Officers (BLOs), for which the party blamed the Election Commission. With the draft list now out, another round of political confrontation appears imminent.

As objections begin to be filed, the focus will be on whether the correction mechanism is accessible, transparent, and timely—critical factors in ensuring that no eligible voter is denied their democratic right ahead of a crucial election.

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News Network
December 13,2025

New Delhi: School-going children are picking up drug and smoking habits and engaging in consumption of alcohol, with the average age of introduction to such harmful substances found to be around 13 years, suggesting a need for earlier interventions as early as primary school, a multi-city survey by AIIMS-Delhi said.

The findings also showed substance use increased in higher grades, with grade XI/XII students two times more likely to report use of substances when compared with grade VIII students. This emphasised the importance of continued prevention and intervention through middle and high school.

The study led by Dr Anju Dhawan of AIIMS's National Drug Dependence Treatment Centre, published in the National Medical Journal of India this month, looks at adolescent substance use across diverse regions.

The survey included 5,920 students from classes 8, 9, 11 and 12 in urban government, private and rural schools across 10 cities -- Bengaluru, Chandigarh, Delhi, Dibrugarh, Hyderabad, Imphal, Jammu, Lucknow, Mumbai, and Ranchi. The data were collected between May 2018 and June 2019.

The average age of initiation for any substance was 12.9 (2.8) years. It was lowest for inhalants (11.3 years) followed by heroin (12.3 years) and opioid pharmaceuticals (without prescription; 12.5 years).

Overall, 15.1 per cent of participants reported lifetime use, 10.3 per cent reported past year use, and 7.2 per cent reported use in the past month of any substance, the study found.

The most common substances used in the past year, after tobacco (4 per cent) and alcohol (3.8 per cent), were opioids (2.8 per cent), followed by cannabis (2 per cent) and inhalants (1.9 per cent). Use of non-prescribed pharmaceutical opioids was most common among opioid users (90.2 per cent).

On being asked, 'Do you think this substance is easily available for a person of your age' separately for each substance category, nearly half the students (46.3 per cent) endorsed that tobacco products and more than one-third of the students (36.5 per cent) agreed that a person of their age can easily procure alcohol products.

Similarly, for Bhang (21.9 per cent), ganja/charas (16.1 per cent), inhalants (15.2 per cent), sedatives (13.7 per cent), opium and heroin (10 per cent each), the students endorsed that these can be easily procured.

About 95 per cent of the children, irrespective of their grade, agreed with the statement that 'drug use is harmful'.

The rates of substance use (any) among boys were significantly higher than those of girls for substance use (ever), use in the past year and use in the past 30 days. Compared to grade VIII students, grade IX students were more likely, and grade XI/XII students were twice as likely to have used any substance (ever).

The likelihood of past-year use of any substance was also higher for grade IX students and for grade XI/XII students as compared to grade VIII students.

About 40 per cent of students mentioned that they had a family member who used tobacco or alcohol each. The use of cannabis (any product) and opioid (any product) by a family member was reported by 8.2 per cent and 3.9 per cent of students, respectively, while the use of other substances, such as inhalants/sedatives by family was 2-3 per cent, the study found.

A relatively smaller percentage of students reported use of tobacco or alcohol among peers as compared to among family members, while a higher percentage reported inhalants, sedatives, cannabis or opioid use among peers.

Children using substances (past year) compared to non-users reported significantly higher any substance use by their family members and peers.

There were 25.7 per cent students who replied 'yes' to the question 'conflicts/fights often occur in your family'. Most students also replied affirmatively to 'family members are aware of how their time is being spent' and 'damily members are aware of with whom they spend their time'.

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