Author Topic: Chandrayaan-2 Mission - Launch and Landing Coverage  (Read 479693 times)

Offline Steven Pietrobon

  • Member
  • Senior Member
  • *****
  • Posts: 31040
  • Adelaide, Australia
    • Steven Pietrobon's Space Archive
  • Liked: 19055
  • Likes Given: 3063
Re: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #540 on: 07/14/2019 09:05 pm »
PTI (Press Trust of India) saying launch is scrubbed due to a technical issue.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.


Offline Steven Pietrobon

  • Member
  • Senior Member
  • *****
  • Posts: 31040
  • Adelaide, Australia
    • Steven Pietrobon's Space Archive
  • Liked: 19055
  • Likes Given: 3063
Re: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #542 on: 07/14/2019 09:08 pm »
Closeup of the clock. Talking about why the new GLSV Mk.III is used.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Ken the Bin

  • Full Member
  • ****
  • Posts: 1405
  • US Pacific Time Zone
  • Liked: 2138
  • Likes Given: 2216
Re: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #543 on: 07/14/2019 09:09 pm »
https://twitter.com/isro/status/1150512237045379072
Quote
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.

Offline vyoma

  • Full Member
  • ****
  • Posts: 1591
  • India
  • Liked: 534
  • Likes Given: 120

Offline Steven Pietrobon

  • Member
  • Senior Member
  • *****
  • Posts: 31040
  • Adelaide, Australia
    • Steven Pietrobon's Space Archive
  • Liked: 19055
  • Likes Given: 3063
Re: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #545 on: 07/14/2019 09:09 pm »
Official ISRO announcement soon.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline ChrisGebhardt

  • Assistant Managing Editor
  • Global Moderator
  • Senior Member
  • *****
  • Posts: 7841
  • ad astra scientia
  • ~1 AU
  • Liked: 7770
  • Likes Given: 853
Re: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #546 on: 07/14/2019 09:09 pm »
And there you have it, no official reschedule to the launch at this time.

https://twitter.com/isro/status/1150512237045379072

Offline Steven Pietrobon

  • Member
  • Senior Member
  • *****
  • Posts: 31040
  • Adelaide, Australia
    • Steven Pietrobon's Space Archive
  • Liked: 19055
  • Likes Given: 3063
Re: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #547 on: 07/14/2019 09:11 pm »
ISRO announcing "technical snag". Basically, reading out the tweet.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

  • Member
  • Senior Member
  • *****
  • Posts: 31040
  • Adelaide, Australia
    • Steven Pietrobon's Space Archive
  • Liked: 19055
  • Likes Given: 3063
Re: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #548 on: 07/14/2019 09:14 pm »
20 day window for launch. Window is 16 minutes tomorrow.
« Last Edit: 07/14/2019 09:16 pm by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline ChrisGebhardt

  • Assistant Managing Editor
  • Global Moderator
  • Senior Member
  • *****
  • Posts: 7841
  • ad astra scientia
  • ~1 AU
  • Liked: 7770
  • Likes Given: 853
Re: SCRUB: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #549 on: 07/14/2019 09:24 pm »
20 day window for launch. Window is 16 minutes tomorrow.

Since ISRO did not broadcast this on their live stream, can you clarify for everyone?  Does the launch window tomorrow open 16 minutes earlier than today?  Is it the same time (21:21 UTC) and 16mins in duration?  Did they confirm that they are targeting tomorrow for launch?


Also, I have people on twitter telling me that tomorrow is the last day of the launch window, but you're saying ISRO said there are 20 more days in the window?
« Last Edit: 07/14/2019 09:27 pm by ChrisGebhardt »

Offline K210

  • Full Member
  • ****
  • Posts: 572
  • Liked: 215
  • Likes Given: 17
Re: SCRUB: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #550 on: 07/14/2019 09:27 pm »
20 day window for launch. Window is 16 minutes tomorrow.

Since ISRO did not broadcast this on their live stream, can you clarify for everyone?  Does the launch window tomorrow open 16 minutes earlier than today?  Is it the same time (21:21 UTC) and 16mins in duration?  Did they confirm that they are targeting tomorrow for launch?

Date for next launch attempt has not been announced yet.
« Last Edit: 07/14/2019 09:28 pm by K210 »

Offline Steven Pietrobon

  • Member
  • Senior Member
  • *****
  • Posts: 31040
  • Adelaide, Australia
    • Steven Pietrobon's Space Archive
  • Liked: 19055
  • Likes Given: 3063
Re: SCRUB: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #551 on: 07/14/2019 09:31 pm »
20 day window for launch. Window is 16 minutes tomorrow.

Since ISRO did not broadcast this on their live stream, can you clarify for everyone?

This information came from one of the speakers in the NDTV broadcast.

Quote
Does the launch window tomorrow open 16 minutes earlier than today?

I don't believe so. They did mention when the window opens, but I didn't get that information down. As its a 24/7 channel, I can't go back to rehear it.

Quote
Is it the same time (21:21 UTC) and 16mins in duration?

I don't think its the same time. The window duration is 16 minutes.

Quote
Did they confirm that they are targeting tomorrow for launch?

No. They are waiting for ISRO to announce this.

Quote
Also, I have people on twitter telling me that tomorrow is the last day of the launch window, but you're saying ISRO said there are 20 more days in the window?

Tomorrow is not the last day. The expert from NDTV (Alok Chatterjee, NASA Interface Manager) said the window is 20 days.

This reporter saying that the window for tomorrow is 16 minutes. After that, the window is only 1 minute long. He is reporting that information from a previous press conference.
« Last Edit: 07/14/2019 09:41 pm by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline ChrisGebhardt

  • Assistant Managing Editor
  • Global Moderator
  • Senior Member
  • *****
  • Posts: 7841
  • ad astra scientia
  • ~1 AU
  • Liked: 7770
  • Likes Given: 853
Re: SCRUB: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #552 on: 07/14/2019 09:36 pm »
20 day window for launch. Window is 16 minutes tomorrow.

Since ISRO did not broadcast this on their live stream, can you clarify for everyone?

This information came from one of the speakers in the NDTV broadcast.

Quote
Does the launch window tomorrow open 16 minutes earlier than today?

I don't believe so. They did mention when the window opens, but I didn't get that information down. As its a 24/7 channel, I can't go back to rehear it.

Quote
Is it the same time (21:21 UTC) and 16mins in duration?

I don't think its the same time. The window duration is 16 minutes.

Quote
Did they confirm that they are targeting tomorrow for launch?

No. They are waiting for ISRO to announce this.

In the future, we should note where information comes from.  Non-ISRO information is confusing, and I've been told via Twitter that an ISRO release from May says tomorrow is the last day of the window (which only opened on 9 July, so wasn't 20 days in duration).

The press release giving tomorrow as the close of the launch window: https://www.isro.gov.in/update/01-may-2019/press-release-chandrayaan-2
« Last Edit: 07/14/2019 09:36 pm by ChrisGebhardt »

Offline Steven Pietrobon

  • Member
  • Senior Member
  • *****
  • Posts: 31040
  • Adelaide, Australia
    • Steven Pietrobon's Space Archive
  • Liked: 19055
  • Likes Given: 3063
Re: SCRUB: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #553 on: 07/14/2019 09:45 pm »
Another tweet from ISRO confirming delay.

https://twitter.com/isro/status/1150520298761936896

"ISRO
‏Verified account @isro
5 minutes ago

A technical snag was observed in launch vehicle system at 1 hour before the launch. As a measure of abundant precaution, #Chandrayaan2 launch has been called off for today. Revised launch date will be announced later."
« Last Edit: 07/14/2019 10:08 pm by Chris Bergin »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Ken the Bin

  • Full Member
  • ****
  • Posts: 1405
  • US Pacific Time Zone
  • Liked: 2138
  • Likes Given: 2216
Re: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #554 on: 07/14/2019 09:55 pm »
https://twitter.com/isro/status/1150512237045379072
Quote
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.

Note that ISRO has deleted the above tweet and replaced it with:

https://twitter.com/isro/status/1150520298761936896
Quote
A technical snag was observed in launch vehicle system at 1 hour before the launch. As a measure of abundant precaution, #Chandrayaan2 launch has been called off for today. Revised launch date will be announced later.

Offline K210

  • Full Member
  • ****
  • Posts: 572
  • Liked: 215
  • Likes Given: 17
Re: SCRUB: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #555 on: 07/14/2019 10:13 pm »
Hope they are able to launch sometime this month. If they are not able to they will have to delay all the way into september as this will be the next avaliable launch window after july.

Offline Steven Pietrobon

  • Member
  • Senior Member
  • *****
  • Posts: 31040
  • Adelaide, Australia
    • Steven Pietrobon's Space Archive
  • Liked: 19055
  • Likes Given: 3063
Re: SCRUB: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #556 on: 07/14/2019 10:14 pm »
OK, I misunderstood what Chatterjee said. In a replay, he was talking about a hypothethical Mars mission with a 20 day window. I misunderstood that as the window for Chandrayaan 2. My apologies.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline vyoma

  • Full Member
  • ****
  • Posts: 1591
  • India
  • Liked: 534
  • Likes Given: 120
Re: SCRUB: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #557 on: 07/14/2019 10:19 pm »
https://news24online.com/news/why-chandrayaan-2-launch-was-postponed-get-all-information-here-9e32bbc1

Quote
"The technical snag was noticed during the cryogenic fuel was being loaded. We have to approach the vehicle to assess the problem. First we have to empty the fuel loaded in the rocket, then the rocket will be taken back for further investigation," an ISRO source told IANS.

Quote
"This process will take 10 days after that only we can decide on the launch schedule," the source added.

Offline sanman

  • Senior Member
  • *****
  • Posts: 5450
  • Liked: 1077
  • Likes Given: 8
Re: SCRUB: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #558 on: 07/14/2019 11:44 pm »
Can we have some (speculative) discussion of the possible technical issues here?

If hypothetically it was the "fuel conductor" that posed a problem, then what might have happened?
What is a "fuel conductor" in the first place? Is that an ISRO-specific term? What's the general term for that? Is this some intake port where the cryo fuel is loaded into? Or is it some feed line into the cryo engine?
I'm assuming it was related to the ultra-cold LH2 fuel, since that's the most difficult to deal with - but could it have been the LOX?

Could ultra-cold temperature have caused something to clog up or foul up? Was anything being done differently for this launch as compared to the previous 2 development launches?
« Last Edit: 07/14/2019 11:46 pm by sanman »

Offline Steven Pietrobon

  • Member
  • Senior Member
  • *****
  • Posts: 31040
  • Adelaide, Australia
    • Steven Pietrobon's Space Archive
  • Liked: 19055
  • Likes Given: 3063
Re: SCRUB: Chandrayaan-2 GSLV MkIII - July 14, 2019 (2121 UTC)
« Reply #559 on: 07/15/2019 01:01 am »
What is a "fuel conductor" in the first place?

My guess is that they a referring to a fuel (LH2) pipe. Its anyone's guess what the problem is.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

 

Advertisement NovaTech
Advertisement SkyTale Software GmbH
Advertisement Northrop Grumman
Advertisement
Advertisement Brady Kenniston
Advertisement NextSpaceflight
Advertisement Nathan Barker Photography
0