NASA launches satellite to track Earth's melting ice
Washington, Sep 15 : In a bid to understand Earth's ice sheets, glaciers, sea ice, snow cover and permafrost, NASA on Saturday successfully launched its Ice, Cloud and Land Elevation Satellite-2, or ICESat-2.
The satellite with a three-year mission was launched at 9.02 a.m EDT on September 15, with liftoff aboard a Delta II rocket from Space Launch Complex-2 at Vandenberg Air Force Base in California.
"Today was the #Delta II's final launch! ULALaunch used the last #Delta II rocket for the 9:02 a.m EDT liftoff of NASA_ICE's #ICESat2 this morning. Once on orbit, #ICESat2 will measure the thickness of Earth's polar ice sheets," the US space agency said in a tweet.
NASA had earlier in the day said the weather is favourable for the launch.
"The forecast remains 100 per cent 'go' on all constraints," Lt. Daniel Smith of Launch Weather Officer said while briefing the team on forecast.
It also carries twin ELFIN CubeSats
"Today's #ICESat2 launch comes with a bonus -- a pair of tiny satellites that will study how energetic electrons make their way into our atmosphere from space," NASA tweeted.
The Delta II rocket, in use since 1989, has a stellar track record. It has launched 154 times, carrying payloads aloft for NASA, the US military and commercial clients.
ICESat-2 is NASA's most advanced Laser instrument -- the Advanced Topographic Laser Altimeter System, or ATLAS.
It measures height by precisely timing how long it takes individual photons of light from a Laser to leave the satellite, bounce off Earth and return to the satellite.
The satellite will provide critical observations of how ice sheets, glaciers and sea ice are changing, leading to insights into how these changes impact people where they live, NASA said.
ICESat-2's orbit will make 1,387 unique ground tracks around Earth in 91 days and then start the same ground pattern again at the beginning.
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SWR announces special trains for passengers stranded by large-scale IndiGo cancellations
Bengaluru (PTI): The South Western Railway on Saturday announced a series of special trains, in coordination with Central, South Eastern and Southern Railways, to clear stranded passengers following large-scale IndiGo flight cancellations across the country.
The special services will operate between December 6 and 10 on high-demand routes, including Bengaluru–Chennai, Bengaluru–Pune, Yesvantpur–Hazrat Nizamuddin, Shalimar–Yelahanka and Ernakulam–Yelahanka, officials said.
According to an official statement, SWR will run Train No. 06255/06256 between Chennai Egmore and KSR Bengaluru, 06257/06258 between Bengaluru and MGR Chennai Central, 06259/06260 between Yesvantpur and Hazrat Nizamuddin, and 06263/06264 between Bengaluru and Pune.
ALSO READ: Indigo flights chaos: SCR to run special trains to clear passenger rush
Central Railway will operate Train No. 01413/01414 between Pune and Bengaluru, while South Eastern Railway will run Train No. 08073/08074 between Shalimar and Yelahanka. Southern Railway will operate Train No. 06147/06148 between Ernakulam and Yelahanka, the statement said.
Railways has advised passengers to check updated timings on its official channels and arrive early at stations.
For at least five days in a row, IndiGo flight operations have been significantly disrupted, with a large number of cancellations and delays causing hardships to thousands of passengers. In many cases, baggage has been misplaced.
