Author Topic: Chandrayaan-2 GSLV MkIII NET January 30 2019  (Read 165501 times)

Offline K210

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Re: Chandrayaan-2 GSLV October 2018
« Reply #300 on: 05/08/2018 08:49 AM »
IIRS payload has been dispatched from SAC to ISAC for integration onto chandraayan-2 spacecraft. Dispatch took place on 9th April 2018.

Source: https://www.reddit.com/r/ISRO/comments/8azu39/gsat29_payload_and_iirs_payload_for_chandrayaanii/

Offline chota

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Re: Chandrayaan-2 GSLV October 2018
« Reply #301 on: 07/05/2018 06:06 PM »
Some old tests conduction earlier as part of lander experiments
https://www.youtube.com/watch?v=r6SrZ_pYHpM&feature=youtu.be&start=14&end=20
« Last Edit: 07/05/2018 06:06 PM by chota »

Offline Steven Pietrobon

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Re: Chandrayaan-2 GSLV October 2018
« Reply #302 on: 07/06/2018 04:06 AM »
Man, I can't stand those YouTube videos with robot voices. This is where the news came from for that video.

https://www.indiatimes.com/news/india/ahead-of-launch-chandrayaan-2-to-undergo-bungee-jump-like-simulation-test-in-mahendragiri-337615.html
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline chota

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Re: Chandrayaan-2 GSLV October 2018
« Reply #303 on: 07/16/2018 04:14 PM »

Offline TheVarun

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Re: Chandrayaan-2 GSLV October 2018
« Reply #304 on: 07/16/2018 04:25 PM »

^
 That can't be right, at least it shouldn't be!  ISRO has repeatedly stated that October would be an ideal month to launch Chandrayaan-2, because of the earth-moon distance at the time.   Must be a major oversight by NDTV-one is hoping anyway!

Offline worldtimedate

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Re: Chandrayaan-2 GSLV October 2018
« Reply #305 on: 07/17/2018 11:23 PM »

^
 That can't be right, at least it shouldn't be!  ISRO has repeatedly stated that October would be an ideal month to launch Chandrayaan-2, because of the earth-moon distance at the time.   Must be a major oversight by NDTV-one is hoping anyway!

According to this this Economic Times report also, the launch of Chandrayaan - 2 is not on cards this year. This makes me believe that Chandrayaan - 2 will NOT be launched until the launch of GSAT-7A by GSLV-II. I think, ISRO does NOT want to take risk without testing the capability of high thrust Vikas engine.

Offline TheVarun

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Re: Chandrayaan-2 GSLV October 2018
« Reply #306 on: 07/18/2018 01:55 PM »
[

According to this this Economic Times report also, the launch of Chandrayaan - 2 is not on cards this year. This makes me believe that Chandrayaan - 2 will NOT be launched until the launch of GSAT-7A by GSLV-II. I think, ISRO does NOT want to take risk without testing the capability of high thrust Vikas engine.

  Makes sense!  Any idea what would be the next most optimised launch date for a moon mission? One hopes its not Oct 2019!  True though, that caution is a sound policy. The Economic Times article does not emphatically say that "there will be no Chandrayaan mission in October". Perhaps what is happening is that they are conducting rigorous tests of a bunch of things, and if all those turn out well, they will launch Chandrayaan. But they don't want to build up hopes, considering the very high profile nature of the venture.

Being optimistic :)

Offline abhishek

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Re: Chandrayaan-2 GSLV NET end 2018
« Reply #307 on: 08/04/2018 12:47 PM »
Chandrayaan 2 Delayed, Israel Could Beat India In Race To Moon's Surface

Quote
Dr M Annadurai, Director of U R Rao Satellite Centre confirmed to NDTV  that the launch date for Chandryaan-2 "is slipping to 2019" from the initially planned launch in October this year.

Dr Annadurai said that India's moon mission now aims to land in February and the rocket launch will take place in January next year.

Moreover, since the weight of the Chandrayaan-2 satellite has increased, Dr Annadurai said that now instead of GSLV MK-II, GSLV MK-III will be used

https://www.ndtv.com/india-news/chandrayaan-2-delayed-israel-could-beat-india-in-race-to-moons-surface-1895221
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Dont want to indulge in a political debate but i find news articles of Mr Bagla to be quite irritating in nature as it's more on nationalism and jingoism rather than on science....3rd country to do this,4th country to do that,gslv the bahubali rocket etc etc....

« Last Edit: 08/04/2018 01:06 PM by abhishek »
10, 9, ignition sequence start 6, 5, 4, 3, 2, 1, 0, all engines running Lift off, we have a lift off, lift off

Offline TheVarun

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #308 on: 08/04/2018 01:55 PM »
 ^
Agree. There's a little too much of that nationalism and jingoism in Bagla's reports- and he's supposed to be a science writer!  It's okay to mention it, but it shouldn't be the centrepiece or the dominant theme. I don't like Frontline magazine( way too left politically!) but they have excellent science and technology articles by T.S Subramanian and R. Ramachandran, particularly in the area of aerospace. The first, second, 5th, 6th et al are certainly brought up, as they should be, but the accent is on the actual science and technology, and the challenges therein.

Offline TheVarun

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Re: Chandrayaan-2 GSLV NET end 2018
« Reply #309 on: 08/04/2018 02:02 PM »
Chandrayaan 2 Delayed, Israel Could Beat India In Race To Moon's Surface

Quote
Dr M Annadurai, Director of U R Rao Satellite Centre confirmed to NDTV  that the launch date for Chandryaan-2 "is slipping to 2019" from the initially planned launch in October this year.

Dr Annadurai said that India's moon mission now aims to land in February and the rocket launch will take place in January next year.

   
   A little disappointing, of course, but January 2019 isn't bad. For something as complex as a moon mission, better not to take chances.  But the news of GSLV Mark 3 being used for the launch, is startling. That was never spoken of before by ISRO, now it's pretty concrete!  All this time, only GSLV Mark 2 was spoken of.

Offline sanman

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #310 on: 08/05/2018 12:23 AM »
Dont want to indulge in a political debate but i find news articles of Mr Bagla to be quite irritating in nature as it's more on nationalism and jingoism rather than on science....3rd country to do this,4th country to do that,gslv the bahubali rocket etc etc....

^
Agree. There's a little too much of that nationalism and jingoism in Bagla's reports- and he's supposed to be a science writer!  It's okay to mention it, but it shouldn't be the centrepiece or the dominant theme. I don't like Frontline magazine( way too left politically!) but they have excellent science and technology articles by T.S Subramanian and R. Ramachandran, particularly in the area of aerospace. The first, second, 5th, 6th et al are certainly brought up, as they should be, but the accent is on the actual science and technology, and the challenges therein.

I don't feel that it's fair to single out Mr Bagla for that - to be fair, all members of the Indian media do that - he's a passionate science communicator. It's also about drumming up enthusiasm among the public for India's space program.


Offline sanman

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Re: Chandrayaan-2 GSLV NET end 2018
« Reply #311 on: 08/05/2018 12:27 AM »
Chandrayaan 2 Delayed, Israel Could Beat India In Race To Moon's Surface

Quote
Dr M Annadurai, Director of U R Rao Satellite Centre confirmed to NDTV  that the launch date for Chandryaan-2 "is slipping to 2019" from the initially planned launch in October this year.

Dr Annadurai said that India's moon mission now aims to land in February and the rocket launch will take place in January next year.
   
   A little disappointing, of course, but January 2019 isn't bad. For something as complex as a moon mission, better not to take chances.  But the news of GSLV Mark 3 being used for the launch, is startling. That was never spoken of before by ISRO, now it's pretty concrete!  All this time, only GSLV Mark 2 was spoken of.

With GSLV-Mk3 being used, it would have been nice if its higher payload margin could have allowed the use of a heavier and more robust rover & lander. The current lunar rover is looking a little minimalist and barebones - Oh well, can't revise things now.
« Last Edit: 08/05/2018 12:29 AM by sanman »

Offline K210

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #312 on: 08/05/2018 01:20 AM »
Good move by isro. If they had launched on uprated MK-2 rocket any number of things could have gone wrong given how many new upgrades they are introducing all at once (high thrust vikas, C-15 upper stage etc.). Besides MK-3 with its 4 ton GTO capability is more better suited to a mission like this. Hopefully they increase the mass of Chandraayan-2 to fully utilise MK-3's capability.

Offline Phil Stooke

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #313 on: 08/05/2018 08:34 AM »
"Hopefully they increase the mass of Chandraayan-2 to fully utilise MK-3's capability."

It's a bit too late to be making any changes, if they want to launch in January!  Change nothing at all would be my advice. 

Offline K210

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #314 on: 08/05/2018 10:20 AM »
Quote
It's a bit too late to be making any changes, if they want to launch in January!

Probably true. They could however use the MK3 to launch Chandraayan-2 into a higher initial orbit. This would cut the number of orbit raising manoeuvres required. It would also cut down the time from launch to entering lunar orbit.

If they had gone with MK3 sooner they could have built a more advanced rover with more science instruments. They might have even been able to test a prototype return capsule for a future sample return mission.

Offline TripleSeven

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #315 on: 08/05/2018 10:50 AM »
^
Agree. There's a little too much of that nationalism and jingoism in Bagla's reports- and he's supposed to be a science writer!  It's okay to mention it, but it shouldn't be the centrepiece or the dominant theme. I don't like Frontline magazine( way too left politically!) but they have excellent science and technology articles by T.S Subramanian and R. Ramachandran, particularly in the area of aerospace. The first, second, 5th, 6th et al are certainly brought up, as they should be, but the accent is on the actual science and technology, and the challenges therein.

No buck no buck rogers.  To most in India the science means very little but the nationalism aspect of it means a lot 

Offline worldtimedate

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #316 on: 08/06/2018 12:59 AM »
Now TimesofIndia is saying that Chandrayaan-2 Mission has been put off till December.

Source : Chandrayaan-2 launch put off: India, Israel in lunar race for 4th position

Quote
India's most ambitious Chandrayaan-2 mission, which was earlier scheduled for October first week, has been postponed till December, according to an Isro source.

Unlike the Chandrayaan-1 programme in 2008 that involved only orbiting around the moon, Chandrayaan-2 is a much complicated mission as it involves an orbiter, a lander and a rover. The mission involves a soft-landing on the lunar surface and a rover that will walk and analysis the content on the moon's surface. Being India's most challenging mission, Isro doesn't want to take chances and taking time to fix all glitches in the lunar mission.

Quote
As the weight of the Chandrayaan-2 spacecraft has increased, according to the source, GSLV Mk III or Isro's 'fat boy' will now carry the spacecraft as it has the lifting capability of over four tonne. According to the earlier plan, GSLV Mk II which just three-tonne lifting capability was supposed to carry the payload.

Quote
Describing India's Chandrayaan-2 mission, the Isro chairman had earlier told TOI, "It is totally an indigenous programme. All components of the Chandrayaan-2 mission, including an orbiter, a lander and a rover, have been developed in the country. There integration is going on and they all are undergoing rigorous tests.

Quote
On reaching the moon's orbit, the lander will get detached from the orbiter and soft-land on the lunar surface. The six-wheeled rover fixed within the lander will get detached and move on the lunar surface for around 100 metres. It will spend 14 Earth days (one moon day) and analyse the content. It will also take photos of the moon's surface and relay the images back to the Earth via the orbiter within 15 minutes."

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Offline K210

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #317 on: 08/06/2018 09:01 PM »
Some details about mass increase of chandraayan-2. Lift off mass has gone up from 3,250kg to 3,850kg.

Quote
The national committee that reviewed Chandrayaan-2 in March this year felt soft-landing would be a tricky proposition unless some improvements are made to the lander.

“We decided to add another liquid engine to the lander, revisit the mission sequence and conduct more tests. We realized that the deadlines set earlier were impossible to meet,” said a senior scientist present at the review.

Quote
The Chandrayaan-2 team also decided to have more electronic packages as standby. These additions increased the weight of the spacecraft.

“We could still carry this extra weight using an upgraded version of GSLV-MII, but we decided to go in for GSLV-MIII. And once this was decided, we could build in more redundancies for a safer flight as GSLV-MIII could take much more,”

In effect, the ground mass of Chandrayaan-2 went up from 3,250kg to 3,850kg.

The lander weight went up from 1,250kg to about 1,350, the six-wheeled rover’s weight from 20kg to 25kg. For every extra kilogram of the payload, the lift-off weight of the vehicle increases by 4kg, as more propellent is needed.

Before finalizing GSLV-MIII as the Chandrayaan-2 launcher, Isro had decided to ‘uprate’ GSLV-MII. “We had to uprate the cryogenic system and the liquid engine,” said the review panel member. “But then, we cannot afford to fly Chandrayaan as a test flight of the uprated GSLV-MII. Hence we have decided to use GSLV-MIII. There is a MIII launch scheduled in a couple of months. That launch will give us the confidence to go ahead with Chandrayaan-2.”

Source: https://timesofindia.indiatimes.com/city/chennai/soft-landing-challenges-keep-chandrayaan-2-grounded/articleshow/65293768.cms

« Last Edit: 08/06/2018 09:03 PM by K210 »

Offline worldtimedate

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #318 on: 08/06/2018 09:55 PM »
The following article from the Week is reporting the rethrottling problem with the lander. It appears to me that once ISRO crosses this hurdle related to the lander and the GSLV MK-III comes to fruition in its full payload capacity, this will open door for ISRO many such interplanetary missions.

Source : What caused delay in ISRO's Chandrayaan-2 launch

Quote
Sources say that this time, the delay was caused because the indigenously developed lander was having trouble with rethrottling. The lander has now gone back to the design table for a design change. "The lander was developing vibrations at the time of rethrottling. The problem appears to be with the thrusters," said a senior level official at the Indian Space Research Organisation (ISRO).

Quote
Though the launch has been shifted by just three months but given that the vehicle taking the lander to the moon is also changing, a further delay may not be a surprise. Previously, the GSLV II was scheduled to ferry Chandrayaan 2, now it is reported that the heaviest vehicle in ISRO's stable, the Bahubali or GSLV III, is the vehicle of choice.

Quote
The development has taken time, and given that it is the first time India is developing a lander, the programme has faced many glitches like the present one. While no date was announced for the mission for a long time, it was finally said the rocket would take off in April 2018. But the launch was shifted to the next window, October 2018 and now it has been shifted further.

Sources say that while postponements are disappointing, one cannot compromise accuracy just to stay ahead in the race. A GSLV Mk III launch costs around Rs 4 billion and it also entails years of research and development. Every component needs to be precise before such an ambitious mission can be launched.

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Offline PonRam

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Re: Chandrayaan-2 GSLV MkIII NET January 2019
« Reply #319 on: 08/08/2018 03:10 AM »
Good that they detect and eliminate all these issues here itself. It is an invaluable learning experience for ISRO on throttling of engines to soft land the lander and rover. Experience gained can be resued in returning stages of launch vehicles back to earth too.