India recalls GSAT-11 satellite for tests from Arianespace rocket port.
Chennai, April 25: The Indian space agency has recalled its communication satellite GSAT-11 from Arianespace's rocket port in Kourou in French Guiana, said Arianespace.
"Due to additional technical checks with the Indian Space Research Organisation’s (ISRO) GSAT-11 satellite, to be conducted from the ISRO Satellite Centre (ISAC) located in Bengaluru, the Ariane 5 launch initially planned for May 25, VA243, has been postponed," Arianespace said on Wednesday.
The GSAT-11 was planned to be launched mid May. The satellite had reached Arianespace's rocket port in March.
GSAT-11 was designed, assembled and integrated by the ISRO, and will have an estimated lift-off mass of 5,870 kg.
This advanced communications satellite is to provide multi-spot beam coverage over the Indian mainland and nearby islands, bringing significant advantages to the user community when compared with India's existing INSAT/GSAT satellite systems, Arianespace said earlier in a statement.
With its new system architecture and cutting-edge technology elements, GSAT-11 will generate a capacity of more than 12 Gbps for users from a single platform, the statement added.
It is not known what has prompted ISRO to recall its 5.8-ton satellite GSAT-11 for further tests.
It may be recalled, ISRO lost communication contact with its GSAT-6A communication satellite soon after it was put into orbit on March 29.
ISRO suspects the failure of the power systems in the satellite for the loss of communication link.
"The satellites are powered by solar panels that charge the onboard batteries. The batteries are fully charged when the satellite is loaded on to the rocket.
"Even if there is a problem with the solar panel, then the battery power should have kicked in. Here the entire power system of the satellite seems to have failed," one space expert told IANS earlier.
According to experts, the power system could have failed due to some short circuiting or arcing resulting in what is known in the space terminology 'loss of lock' or loss of contact with the ground station.
Satellites in space are locked to ground stations for tracking and other purposes.
On March 29, Indian rocket Geosynchronous Satellite Launch Vehicle (GSLV) slung GSAT-6A in its intended orbit. From there the satellite was to be taken up further to its orbital slot by firing its onboard motors.
The first orbit raising operation was successfully carried out by firing the onboard motors for around 36 minutes on March 30 morning.
The second orbit raising operation of GSAT-6A satellite was also successful as its motors was fired for about 53 minutes on March 31.
After that the communication link got snapped.
Industry experts also said there has been instances where communication link with satellites got reestablished after a break of couple of days.
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Bombay HC to form high-powered committee on Mumbai air pollution
Mumbai (PTI): The Bombay High Court on Thursday said it would form a high-powered committee to oversee the compliance of measures to tackle air pollution in the Mumbai region, noting that the efforts taken so far by state and civic authorities are insufficient.
It was not criticizing anyone but wanted to ensure that "people should live in pure air," said a division bench led by Chief Justice Shree Chandrashekhar.
The HC had in October 2023 taken suo motu cognizance of the rising pollution in the metropolis "which was ranging between good, satisfactory, moderate poor, very poor and severe", the bench noted.
Directions were issued by the court on November 6, 2023, and suggestions were made for short-term, mid-term and long-term measures.
Since then, the HC has made observations expressing dissatisfaction about the steps taken by the Mumbai and Navi Mumbai civic bodies, the judges said.
The Maharashtra Pollution Control Board (MPCB) is simply "sailing on its affidavits," but the steps purportedly taken by it were not sufficient, the court stated.
Air pollution in Mumbai has not decreased, in fact it was reported to be very severe in December, said the judges.
"We have apprised ourselves of the previous orders, and find that compliances so far made by (municipal) corporations and MPCB are not sufficient and satisfactory," the court said.
The authorities might have taken serious steps but their results were not visible, it added.
The court expressed inability to examine all the affidavits filed by the municipal corporations and MPCB and reports submitted by an expert committee (formed in 2023), citing the "rising number of dockets and limited hours and time."
After hearing all the parties at length, the high court decided to form a high-powered committee led by a former Supreme Court judge to monitor the compliance of measures to tackle air pollution in Mumbai and the surrounding areas.
The committee should meet on a daily basis, the court said, adding that its members should be provided necessary facilities.
The bench also referred to a suggestion that the citizens affected by pollution should be compensated.
The lawyer for the Navi Mumbai Municipal Corporation said there are existing statutory bodies to look into this aspect.
"Maybe there are statutory bodies formed in Maharashtra, but then we have not come across any suggestion or action taken by such a body in the present proceedings..." the court said, adding that it was inclined to give "some powers" to the committee.
The court is expected to finalize the names of the committee members in its written order.
