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Countdown begins for ISRO's historic rocket launch

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The Indian space agency on Saturday at 12.07 a.m. began the 24-hour countdown for the launch of its heavy-lift rocket GSLV Mk III - renamed for this mission as LVM3 M2 - carrying 36 'OneWeb' satellites.


The 43.5 metre tall and weighing 644 ton LVM3 M2 rocket is scheduled to blast off from the first second pad at India's rocket port in Sriharikota in Andhra Pradesh at 12.07 a.m. on Sunday.

"The countdown is in progress smoothly. The gas charging and propellant filling operations of L110 stage are progressing," an Indian Space Research Organisation (ISRO) official told IANS.

During the countdown, the rocket and satellite systems will be checked. The fuel for the rocket will also be filled.

Normally the GSLV rocket is used for launching India's geostationary communication satellites. And hence it was named as GeoSynchronous Satellite Launch Vehicle (GSLV). The GSLV MkIII refers to the third generation rocket.


As the rocket that will fly on Sunday morning will be orbiting the OneWeb satellites in Low Earth Orbit (LEO), the ISRO has renamed GSLV MkIII as LVM3 (Launch Vehicle MkIII).

The rocket, just over 19 minutes into its flight, will sling the 36 small broadband communication satellites of Network Access Associated Ltd (OneWeb) in LEO.

OneWeb, is a joint venture between India Bharti Global and the UK government.

The satellite company plans to have a constellation of about 650 satellites in low earth orbit (LEO) to offer communication services.

The LVM3 M2 is a three stage rocket with the first stage fired with liquid fuel, the two strap on motors powered by solid fuel, the second by liquid fuel and the third is the cryogenic engine.


The ISRO's heavy lift rocket has a carrying capacity of 10 ton to the LEO and four ton to the Geo Transfer Orbit (GTO).

"The total launch mass of OneWeb satellites will be 5,796 kg," said ISRO.

The 36 satellites will be on a dispenser system made by the Swiss based Beyond Gravity, formerly RUAG Space.

The Beyond Gravity had earlier provided the satellite dispensers for launching 428 OneWeb satellites to Arianespace.

"The dispenser with 36 satellites was supplied by the vendor. It was used in all their earlier launches," the official told IANS.


For Beyond Gravity, this is the first time their dispenser is fitted in an Indian rocket.

Starting in 1999, ISRO has put into orbit 345 foreign satellites till date.

The successful launch of 36 OneWeb satellites will take the tally to 381.

Another set of 36 satellites from OneWeb is planned to be put into orbit in January 2023.

This launch brings OneWeb's constellation to 462 satellites, more than 70 per cent of the satellites required for OneWeb to reach global coverage.


According to ISRO, the OneWeb Constellation operates in a LEO Polar Orbit.

The satellites are arranged in 12 rings (Orbital planes) with 49 satellites in each plane. The orbital planes are inclined to be near polar (87.9 Degree) and at 1,200 km above the Earth.

Each satellite completes a full trip around the earth every 109 minutes.

The earth is rotating underneath satellites, so they will always be flying over new locations on the ground. The constellation will have 648 satellites.

NewSpace India Ltd (NSIL), the commercial arm of ISRO, has signed two contracts with Network Access Associated Ltd (OneWeb) for launching the latter's broadband communication satellites in low earth orbit.


The board of OneWeb had voted to suspend satellite launches from the Baikonur rocket port in Russia.

Meanwhile, the Sunday rocket mission has several firsts for the Indian space sector. It is the first commercial launch of GSLV MkIII and for the first time an Indian rocket will be ferrying a payload of about six tonnes. Similarly, the OneWeb is using an Indian rocket to put its satellites into orbit for the first time. Also, it is the first commercial launch of GSLV MkIII contracted by NSIL, and for the first time a renamed GSLV MkIII is being used for launching satellites in LEO.

 
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Second successful operational launch of GSLV MK 3 (Fifth successful launch if including previous test launches) showcasing its reliability and safety, this takes us a step closer to human spaceflight mission.
 
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The Indian space agency on Saturday at 12.07 a.m. began the 24-hour countdown for the launch of its heavy-lift rocket GSLV Mk III - renamed for this mission as LVM3 M2 - carrying 36 'OneWeb' satellites.


The 43.5 metre tall and weighing 644 ton LVM3 M2 rocket is scheduled to blast off from the first second pad at India's rocket port in Sriharikota in Andhra Pradesh at 12.07 a.m. on Sunday.

"The countdown is in progress smoothly. The gas charging and propellant filling operations of L110 stage are progressing," an Indian Space Research Organisation (ISRO) official told IANS.

During the countdown, the rocket and satellite systems will be checked. The fuel for the rocket will also be filled.

Normally the GSLV rocket is used for launching India's geostationary communication satellites. And hence it was named as GeoSynchronous Satellite Launch Vehicle (GSLV). The GSLV MkIII refers to the third generation rocket.


As the rocket that will fly on Sunday morning will be orbiting the OneWeb satellites in Low Earth Orbit (LEO), the ISRO has renamed GSLV MkIII as LVM3 (Launch Vehicle MkIII).

The rocket, just over 19 minutes into its flight, will sling the 36 small broadband communication satellites of Network Access Associated Ltd (OneWeb) in LEO.

OneWeb, is a joint venture between India Bharti Global and the UK government.

The satellite company plans to have a constellation of about 650 satellites in low earth orbit (LEO) to offer communication services.

The LVM3 M2 is a three stage rocket with the first stage fired with liquid fuel, the two strap on motors powered by solid fuel, the second by liquid fuel and the third is the cryogenic engine.


The ISRO's heavy lift rocket has a carrying capacity of 10 ton to the LEO and four ton to the Geo Transfer Orbit (GTO).

"The total launch mass of OneWeb satellites will be 5,796 kg," said ISRO.

The 36 satellites will be on a dispenser system made by the Swiss based Beyond Gravity, formerly RUAG Space.

The Beyond Gravity had earlier provided the satellite dispensers for launching 428 OneWeb satellites to Arianespace.

"The dispenser with 36 satellites was supplied by the vendor. It was used in all their earlier launches," the official told IANS.


For Beyond Gravity, this is the first time their dispenser is fitted in an Indian rocket.

Starting in 1999, ISRO has put into orbit 345 foreign satellites till date.

The successful launch of 36 OneWeb satellites will take the tally to 381.

Another set of 36 satellites from OneWeb is planned to be put into orbit in January 2023.

This launch brings OneWeb's constellation to 462 satellites, more than 70 per cent of the satellites required for OneWeb to reach global coverage.


According to ISRO, the OneWeb Constellation operates in a LEO Polar Orbit.

The satellites are arranged in 12 rings (Orbital planes) with 49 satellites in each plane. The orbital planes are inclined to be near polar (87.9 Degree) and at 1,200 km above the Earth.

Each satellite completes a full trip around the earth every 109 minutes.

The earth is rotating underneath satellites, so they will always be flying over new locations on the ground. The constellation will have 648 satellites.

NewSpace India Ltd (NSIL), the commercial arm of ISRO, has signed two contracts with Network Access Associated Ltd (OneWeb) for launching the latter's broadband communication satellites in low earth orbit.


The board of OneWeb had voted to suspend satellite launches from the Baikonur rocket port in Russia.

Meanwhile, the Sunday rocket mission has several firsts for the Indian space sector. It is the first commercial launch of GSLV MkIII and for the first time an Indian rocket will be ferrying a payload of about six tonnes. Similarly, the OneWeb is using an Indian rocket to put its satellites into orbit for the first time. Also, it is the first commercial launch of GSLV MkIII contracted by NSIL, and for the first time a renamed GSLV MkIII is being used for launching satellites in LEO.



It is will be a colossal failure like the last one.

Looking forward to this failure too.
 
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Not going to get petty on this. Credit where credit is due and wish the rest of the subcontinent can do as well someday.

Congrats to Indians on this achievement and best of luck on the launch. This is some massive effort.

Mubarak ho....

I just wish they can hire someone to do a better countdown from among 1.4 Billion people.

Better than "Thraayyy, Tawww, Vunnn". It's an embarrassment.
 
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A little childish post but this was ISROs way of celebrating diwali unlike us common folks by launching actual rockets :partay:
Happy Diwali everyone :D
 
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Another launch is scheduled for Feb 2023, eventually GSLV Mk3 will be the workhorse of ISRO, and not PSLV.
 
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A little childish post but this was ISROs way of celebrating diwali unlike us common folks by launching actual rockets :partay:
Happy Diwali all Indian members :D

Kiun, there are Diwali celebrations outside India as well.....have a happy Diwali.
 
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When has GSLV MK 3 even failed? That too colossaly?

His knowledge of space launch vehicle comes from SUPARCO, that itself is self explanatory.


India’s new SSLV rocket fails in first launch​

by Park Si-soo — August 7, 2022
SSLV liftoff
India’s Small Satellite Launch Vehicle (SSLV) lifted off from Satish Dhawan Space Centre Aug. 6 on its inuagural flight, but failed to place its payload of two smallsats into the proper orbit. Credit: ISRO

Updated 12:30 p.m. Eastern with confirmation of launch failure.
SEOUL, South Korea — The inaugural launch of India’s Small Satellite Launch Vehicle (SSLV) failed to reach orbit Aug. 6 when the rocket’s kick stage malfunctioned.
The three-stage vehicle, capable of placing up to 500 kilograms of payload to a 500-kilometer low Earth orbit, lifted off at 11:48 p.m. Eastern from Satish Dhawan Space Centre’s launch pad No.1, carrying the 135-kilogram Earth observation satellite EOS-02 built by the Indian space agency ISRO and an eight-kilogram cubesat AzaadiSAT, made by Indian students.
Live footage showed the 34-meter rocket, decorated with India’s national flag, soaring into the air. The rocket’s three lower stages used a solid fuel, hydroxyl-terminated polybutadiene, while its final stage, called the Velocity Trimming Module (VTM), used thrusters powered by hydrazine and mixed oxides of nitrogen for the precise deployment of its payloads.
Flight events seen on the live-streamed screen indicated that the rocket’s flight began smoothly. The first stage was separated about two minutes after liftoff as planned, and the second stage did so 3.5 minutes later. The third stage’s separation took place 10.7 minutes after liftoff. The last available data on the screen was that the injection module’s ignition began 10.8 minutes after liftoff but cut off after just one tenth of a second. At one point, the footage showed the EOS-02 satellite being deployed from the module.
Flight events seen on the livestreamed screen. Credit: YouTube video still
S. Somanath, chairman of ISRO, said in remarks a short time later that the first three stages had performed as expected, but “some data loss” had occurred in the final phase of the flight. He did not disclose additional details about the problem but said more details would be announced later. ISRO then ended the launch webcast.
Several hours later, ISRO announced that the VTM had malfunctioned, deploying the satellites into an elliptical orbit of 76 by 356 kilometers, instead of the intended circular orbit of 356 kilometers. “Satellites are no longer usable,” ISRO stated, and likely reentered over the Pacific Ocean.
ISRO said that “failure of a logic to identify a sensor failure” and take corrective action caused the satellites to be deployed into the wrong orbit. ISRO didn’t state if that was linked to the apparent shutdown of the VTM’s thrusters after a tenth of a second.
“This issue related to the SSLV has been reasonably identified, but we will go deeper into it,” Somanath said in a video posted on ISRO’s website. “The system has a deficiency which we need to look at very carefully.”
He emphasized that the first three stages all worked as expected. “The entire vehicle’s performance was very good in the mission,” he said. Other than the VTM malfunction, “we couldn’t see any other anomaly. Every other new element that has been incorporated into this rocket worked very well.”
He was optimistic that the problem can be corrected quickly. “We hope that, with the small corrections and other re-validation of those corrections through an adequate number of tests, we’ll come back for launch for the next development flight of the SSLV, SSLV-D2, very soon.”
ISRO developed SSLV with the aim of providing cheaper and more flexible access to space, compared to its two operational vehicles, the Polar Satellite Launch Vehicle (PSLV) and the Geosynchronous Satellite Launch Vehicle (GSLV). To that end, SSLV was designed to be configured with a simple modular interface, and the vehicle’s assembly can be done horizontally and vertically.
Development of SSLV started in 2017 with an original goal of a first launch as soon as 2019. Its development was delayed by both technical problems, including the failure of a first-stage motor in a static-fire test in 2021, as well as an overall slowdown in Indian space activities linked to the pandemic.
Senior Staff Writer Jeff Foust contributed to this article from Logan, Utah.

 
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