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Chandrayaan-2 launch Highlights: Technical snag observed in launch vehicle system, says ISRO

By Anuj Cariappa
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New Delhi, July 15: Chandrayaan-2 launch has been called off. ISRO made an official announcement a short while ago. The launch has been called off for today and no announcement has yet been made about the next possible date.

A technical snag was observed in launch vehicle system at T-56 minute. As a measure of abundant precaution, #Chandrayaan2 launch has been called off for today. Revised launch date will be announced later, ISRO tweet said.

Chandrayaan-2 launch 2019 LIVE: Countdown begins for lift-off

India will send Chandrayaan-2 to explore the unexplored South Pole region of the moon, not only expanding the country's footprint in space but also showcasing indigenous scientific capacity.

Also Read | Chandrayaan-2: 8 things you must know about ISRO's ambitious moon mission

Chandrayaan-2 comprises of the orbiter (2,379 kg), Vikram (1,471 kg), and Pragyaan (27 kg)

The GSLV Mark-III launch vehicle was moved to the launch pad on July 7.

Here are the highlights:

Newest First Oldest First
3:23 AM, 15 Jul
ISRO's latest tweet.
3:04 AM, 15 Jul
The snag was reportedly in the rocket. It was detected during the fuelling of GSLV-MK-3 during cryogenic stage.
3:03 AM, 15 Jul
Chandrayaan-2 launch has been called off. ISRO made a official announcement a shirt while ago. The launch has been called off for today and no announcement has yet been made anout next possible date.
2:40 AM, 15 Jul
A technical snag was observed in launch vehicle system at T-56 minute. As a measure of abundant precaution, #Chandrayaan2 launch has been called off for today. Revised launch date will be announced later, ISRO tweets.
2:39 AM, 15 Jul
ISRO to make an announcement in next 10 mins.
2:33 AM, 15 Jul
GSLV fuel comprises of liquid hydrogen and liquid hydrogen, these are extremely volatile and combustible.
2:31 AM, 15 Jul
No official statement yet from ISRO. The countdown clock is still stuck at 56:24. The launch window is very very small. Next launch window is tomorrow at 2:52 am.
2:27 AM, 15 Jul
One must keep in mind that the GSLV has been fuelled, if the launch in called off, it will have to be re-fuelled which is a complex process. GSLV is not like PSLV and has a cryogenic engine.
2:10 AM, 15 Jul
The clock which displays countdown has been stopped at 56:24. It is a reverse countdown clock.
1:50 AM, 15 Jul
The launch is at 2.51 am July 15. Exactly an hour left. Scientists take their stations at ISRO's main control room. Anxiousness running high as India is set to launch its most complex space mission till date.
12:20 AM, 15 Jul
Aimed at taking a giant leap in its space programme, India will launch the mission, Chandrayaan-2, on Monday on board its heavy-lift rocket GSLV-Mk III from Sriharikota, Andhra Pradesh, to land a rover near the unexplored lunar southern pole. The lift-off of the spacecraft weighing 3,850 kg and comprising an orbiter, the lander and the rover has been scheduled for 2.51 am from the Satish Dhawan Space Centre (SDSC), sources added. Chandrayaan-2 is an advanced version of the previous Chandrayaan-1 mission which had 11 payloads -- five from India, three from Europe, two from the US and one from Bulgaria. The Chandrayaan-1 mission, launched in 2008, had the credit for discovery of water on the lunar surface.
12:20 AM, 15 Jul
A significant part was the creation of the limbs of the 'Pragyan' with wheels attached to them. The limbs of 'Pragyan' will work independently to help the rover negotiate the lunar surface after it lands on the moon, Maity said. The six-wheeled moon rover can travel up to 500 metres and is solar-powered. While the CTTC had sent seven assemblies for navigation and inertial system to ISRO inertial systems unit, the parts of the cryogenic engine were sent to the space agency's liquid propulsion systems centre, both located in in Thiruvananthapuram, he said. For proper testing products like valves for the launch vehicle, the CTTC has a unit inside the headquarters of the space agency in Bengaluru.
12:20 AM, 15 Jul
Recalling that the CTTC had supplied critical hardware items for the GSLV Chandrayaan 1, Maity said the institution had also made high-precision components this time for the cryogenic engine that will be used in the GSLV Mk-III. Elaborating on the seven assemblies manufactured by the CTTC for navigation and inertial momentum of the orbiter, he said these were solar array drive assemblies (SADA) to help the solar panels of the orbiter and lander; momentum wheel assembly (MWA), reaction wheel assembly (RWA), dynamically tuned gyroscope (DTG), Isro laser gyroscope (ILG), mini advanced inertial navigation system (AINS) and rate gyro electronic package device (RGPD).
12:20 AM, 15 Jul
The Indian Space Research Organisation (ISRO) had earlier said all three modules of the moon mission -- Orbiter, Lander (Vikram) and Rover (Pragyan) -- were getting ready for the launch and the lander was expected to touch down on the lunar surface early in September. The Bhubaneswar-based institution had started manufacturing the parts for the country's prestigious lunar mission in March 2017, the centre's Managing Director Sibasis Maity, told PTI in an interview. Noting that CTTC had signed an agreement with ISRO in 2016 for technology transfer and a contract for supply of spacecraft component, Maity said the arrangement had helped it further strengthening its manufacturing capability. "For the current mission, the CTTC has created 22 varieties of valves for the liquid propulsion system of the launching vehicle to control the fuel while releasing it for combustion," he said.
10:06 PM, 14 Jul
Orbiter, Lander and Rover will remain in contact with ground stations. Among many other studies, the main aim is to study the moon's mineral and chemical composition and its topology and seismology. Measuring moon-quakes and studying the lunar crust and mantle are also said to be objectives of the mission.
10:05 PM, 14 Jul
Orbiter, Lander and Rover will remain in contact with ground stations. Among many other studies, the main aim is to study the moon's mineral and chemical composition and its topology and seismology. Measuring moon-quakes and studying the lunar crust and mantle are also said to be objectives of the mission.
10:05 PM, 14 Jul
Weighing about 3,850 kg, Chandrayaan 2 is a three-in-one integrated spacecraft. Several state-of-art indigenous systems were conceived and realised in the areas of navigation, guidance, control, onboard autonomy, precision sensors, and intricate communication links involving orbiter, lander, rover, and ground systems for this mission, a report in The Print said.
10:01 PM, 14 Jul
India's Chandrayan 2 mission slated for launch in the early hours on Monday will be using indigenously developed special grades of stainless steel in its cryogenic rocket engines.
9:57 PM, 14 Jul
The rover and the lander of the mission will have a life of one lunar day, which is equal to 14 earth days, though the orbiter has a life of one year. The landing window is likely to be between September 6 and 7 because that is the beginning of a lunar day and scientific experiments will be conducted during this period.
8:46 PM, 14 Jul
Important components of the modules of India's ambitious second lunar mission, Chandrayaan-2, to be launched on Monday, have been manufactured by a Union government-run centre here, an official said on Sunday. The Central Tool Room and Training Centre (CTTC) has manufactured 22 types of valves for fuel injection and other parts for the cryogenic engine of the Geosynchronous Satellite Launch Vehicle (GSLV) Mark III rocket, dubbed "fat boy" by Indian scientists for its ability to carry satellites weighing up to 4 tonnes, a top official said. Seven specific assemblies for navigation and inertial momentum of the orbiter and the limbs of the moon rover 'Pragyan' have also been manufactured by the centre.
8:02 PM, 14 Jul
This will be India's first attempt at a soft landing on the moon. If successful, it will make the country the fourth to achieve such a feat, after Russia, the US and China. All previous lunar crafts have landed near the equator and this is the first time one will land near the south pole.
8:00 PM, 14 Jul
Indian Space Research Organisation (ISRO) chairman K Sivan on Saturday said they were all set for the country's prestigious lunar mission. "All preparations for Chandrayaan-2 are going on for the launch scheduled at 2.51 am on July 15 from Sriharikota," Sivan said after offering prayers at the Lord Venkateswara hill shrine at Tirumala near Tirupati.
7:58 PM, 14 Jul
The Moon is the closest cosmic body on which space discovery can be attempted and documented. It is also a promising test bed to demonstrate technologies required for deep-space missions. Chandrayaan 2 attempts to foster a new age of discovery, increase our understanding of space, stimulate the advancement of technology, promote global alliances, and inspire a future generation of explorers and scientists.
6:51 PM, 14 Jul
Akhshay Kumar tweet on Chandrayaan-2:
5:37 PM, 14 Jul
ISRO's ambitious and complex Chandrayaan-2 mission will propel India to the group of elite nations that have successfully landed a lunar craft on moon. Previous mission, Chandarayaan-1 did not involve landing on moon, the main objective of that mission was to produce a complete map of moon's chemical characteristics and three-dimensional topography.
5:10 PM, 14 Jul
The orbiter has one more important task, which is to communicate the findings of the rover. However, the rover is not directly linked to the orbiter and will transmit the findings via the lander. The orbiter will circle the Moon at an altitude of 100 kilometres.
5:08 PM, 14 Jul
Chandrayaan 2, has three important components — the Orbiter, the Lander Vikram and Rover Pragyan. The Orbiter and the Lander will be tucked into the GSLV Mk-III rocket, which will essentially hurl them at the moon. Very precisely and scientifically of course.
3:20 PM, 14 Jul
Former ISRO Chief, G Madhavan Nair said,''Chandrayaan 2 is going to be the most complex mission that ISRO has undertaken so far. Scientifically, it is a follow on mission to confirm data from Chandrayaan-1. It is going to be a big motivator for the young scientific groups.''
3:20 PM, 14 Jul
Ashish Dutta, Professor, IIT Kanpur said,''Chandrayaan2 has many sub-systems. For 2 of them, map generation&path planning sub-systems, MoU was signed between ISRO and IIT Kanpur for software and algorithm development. Structure of this prototype&the one that is actually going is exactly the same.'
3:04 PM, 14 Jul
Ritu Karidhal, the mission director of Chandrayaan-2 was the Deputy Operations Director for the Mars mission. Karidhal has a Master's degree in Aerospace Engineering from Indian Institute of Science, Bengaluru. She is responsible for the spacecraft's outward autonomy system. Karidhal is also known as the 'rocket woman' of India. She has received the ISRO Team Award for MOM, Women Achievers in Aerospace, among other accolades.
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