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.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.
Agencies
May 27,2020

New Delhi, May 27: India’s fourth recession since Independence, first since liberalisation, and perhaps the worst to date is here, according to rating agency, Crisil.

CRISIL sees the Indian economy shrinking 5 per cent in fiscal 2021 (on-year), because of the Covid-19 pandemic. The first quarter will suffer a staggering 25 per cent contraction.

About 10 per cent of gross domestic product (GDP) in real terms could be permanently lost. "So going back to the growth rates seen before the pandemic is unlikely in the next three fiscals", Crisil said.

Crisil has revised its earlier forecast downwards. "Earlier, on April 28, we had slashed our prediction to 1.8 per cent growth from 3.5 per cent growth. Things have only gone downhill since", it said.

While we expect non-agricultural GDP to contract 6 per cent, agriculture could cushion the blow by growing at 2.5 per cent.

In the past 69 years, India has seen a recession only thrice as per available data in fiscals 1958, 1966 and 1980. The reason was the same each time a monsoon shock that hit agriculture, then a sizeable part of the economy.

"The recession staring at us today is different," it added. For one, agriculture could soften the blow this time by growing near its trend rate, assuming a normal monsoon. Two, the pandemic-induced lockdowns have affected most non-agriculture sectors. And three, the global disruption has upended whatever opportunities India had on the exports front.

Economic conditions have slid precipitously since the April-end forecast of 1.8 per cent GDP growth for fiscal 2021 (baseline), Crisil said.

On the lockdown extension, it said that the government has extended the lockdown four times to deal with the rising number of cases, curtailing economic activity severely (lockdown 4.0 is ending on May 31).

The first quarter of this fiscal will be the worst affected. June is unlikely to see major relaxations as the Covid-19 affliction curve is yet to flatten in India.

"Not only will the first quarter be a washout for the non-agricultural economy, services such as education, and travel and tourism among others, could continue to see a big hit in the quarters to come. Jobs and incomes will see extended losses as these sectors are large employers," Crisil said.

CRISIL also foresees economic activity in states with high Covid-19 cases to suffer prolonged disruption as restrictions could continue longer.

A rough estimate based on a sample of eight states, which contribute over half of India's GDP, shows that their 'red zones' (as per lockdown 3.0) contributed 42 per cent to the state GDP on average regardless of the share of such red zones.

On average, the orange zones contribute 46 per cent, while the green zones where activity is allowed to be close to normal contribute only 12 per cent to state GDP.

The economic costs are higher than earlier expectations, according to Crisil. The economic costs now beginning to show up in the hard numbers are far worse than initial expectations.

Industrial production for March fell by over 16%. The purchasing managers indices for the manufacturing and services sectors were at 27.4 and 5.4, respectively, in April, implying extraordinary contraction. That compares with 51.8 and 49.3, respectively, in March.

Exports contracted 60.3 per cent in April, and new telecom subscribers declined 35 per cent, while railway freight movement plunged 35 per cent on-year.

"Indeed, given one of the most stringent lockdowns in the world, April could well be the worst performing month for India this fiscal," it said.

Added to that is the economic package without enough muscle. The government recently announced a Rs 20.9 lakh crore economic relief package to support the economy. The package has some short-term measures to cushion the economy, but sets its sights majorly on reforms, most of which will have payoffs only over the medium term.

"We estimate the fiscal cost of this package at 1.2 per cent of GDP, which is lower than what we had assumed in our earlier estimate (when we foresaw a growth in GDP)," it said.

"We believe a catch-up to the pre-crisis trend level of GDP growth will not be possible in the next three fiscals despite policy support. Under the base case, we estimate a 10 per cent permanent loss to real GDP (from the decadal-trend level), assuming average growth of about 7 per cent between fiscals 2022 and 2024," Crisil said.

Interestingly, after the Global Financial Crisis (GFC), a sharp growth spurt helped catch up with the trend within two years. GDP grew 8.2 per cent on average in the two fiscals following the GFC. Massive fiscal spending, monetary easing and swift global recovery played a role in a V-shaped recovery.

To catch-up would require average GDP growth to surge to 11 per cent over the next three fiscals, something that has never happened before.

The research said that successive lockdowns have a non-linear and multiplicative effect on the economy a two-month lockdown will be more than twice as debilitating as a one-month imposition, as buffers keep eroding.

Partial relaxations continue to be a hindrance to supply chains, transportation and logistics. Hence, unless the entire supply chain is unlocked, the impact of improved economic activity will be subdued.

Therefore, despite the stringency of lockdown easing a tad in the third and the fourth phases, their negative impact on GDP is expected to massively outweigh the benefits from mild fiscal support and low crude oil prices, especially in the April-June quarter. "Consequently, we expect the current quarter's GDP to shrink 25 per cent on-year," it said.

Counting lockdown 4.0, Indians have had 68 days of confinement. S&P Global estimates that one month of lockdown shaves 3 per cent off annual GDP on average across Asia-Pacific.

Since India's lockdown has been the most stringent in Asia, the impact on economic growth will be correspondingly larger.

Google's Community Mobility Reports show a sharp fall in movement of people to places of recreation, retail shops, public transport and workplace travel. While data for May shows some improvement in India, mobility trends are much below the average or baseline, and lower compared with countries such as the US, South Korea, Brazil and Indonesia.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.
News Network
March 18,2020

Dubai, Mar 18: Emirates, one of the world's biggest international airlines, has asked pilots to take unpaid leave to help it mitigate the impact of the coronavirus pandemic that has shattered demand for global travel.

"To this end you are strongly encouraged to make use of this opportunity to volunteer for additional paid and unpaid leave," the airline said in an internal email to pilots, seen by Reuters.

Emirates earlier this month asked some staff to take unpaid leave, although at that time it was not available to pilots.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.
Agencies
June 29,2020

New Delhi, Jun 29: Fuel prices rose on Monday again after a days pause with oil marketing companies increasing the pump price of petrol by 5 paisa and diesel by 13 paisa per litre in Delhi.

In the national capital, petrol price on Monday stood at Rs 80.43 per litre while that of diesel at Rs 80.53 a litre.

With this increase, fuel prices have moved up on 22 of the last 23 days (with no rise on Sunday). Petrol prices, however, were unchanged for an additional day in between after the daily revision based on dynamic pricing was reinstated by OMCs.

Since the daily price revision resumed on June 7, petrol price has increased Rs 9.17 and diesel rose by Rs 11.14 in the national capital. In the other cities the magnitude of increase was similar.

During the past 23 days, the quantum of price hike gradually declined from around 60 paise raise for a few days, immediately post the resumption of daily price revision, to less than 20 paise during the past few days and now even less than 10 paisa per litre.

In a historic development, the price of diesel surged above that of petrol in the national capital during this period. It continues to remain higher even though on Saturday the quantum of petrol price hike was higher than that of diesel.

Officials in oil marketing companies said that it is hard to predict which of the two fuels will be priced higher in the Capital as the gap between the two is almost negligible. But petrol prices have shown more volatility in international markets that may take it ahead once again in coming days.

Apart from Delhi, the retail prices of petrol and diesel have followed the traditional path in other metros with petrol being priced at a premium of between Rs 5 and 8 per litre. The difference between the auto fuel prices in Delhi and other metros is because of the taxation structure.

While both petrol and diesel are at similar levels of taxes (state and centre) in Delhi, it is higher for petrol in many other Indian cities.

Globally diesel is priced a tad higher than petrol. In India too, the base price of diesel is slightly higher than petrol but taxation at central and state levels changed the complexion of retail prices.

If the price of petroleum products and crude hold their positions in global markets, then petrol and diesel prices rise may stop for a longer period and we may even see marginal fall in prices.

Fuel prices have been increasing since June 7 when oil companies began the daily price revision mechanism after a hiatus of 82 days during the lockdown.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.