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Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 02:49
by vijayk
sad but failure is a stepping stone to success.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 02:50
by Zynda
To me, it looked like during Rough Braking, the target min velocity was not reached. If I heard correctly, they were expecting around 140 m/s velocity at the end of rough braking but the actual speed was greater than 200 m/s...but then I saw many scientists clapping...so though performance was naarmal onlee. And the deviation from target path happened during fine braking...So I guess Vikram was descending faster than expected. Anyways, I am sure ISRO would have received lots of data from which lessons will be learnt for future missions.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 02:50
by RKumar
Good job ISRO, failures are the path to success. We will do the home work and do it right next time.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 02:51
by Indranil
Buck up ISRO! HUGE HUGE HUGE hugs from my side to each one of you. We all know what you are made of. This small failure is nothing!

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 02:51
by NRao
Gagan wrote:Final image:
Image
IF the lander had the intelligence to select a spot to land (which was my understanding), then that picture should not be a -ve IMHO.

BTW, the orbiter is doing just fine - for the record.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 02:53
by Gagan
The orbiter has probably taken pics already, if it has passed overhead?

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 02:53
by NRao
Modi Tweet:
India is proud of our scientists! They’ve given their best and have always made India proud. These are moments to be courageous, and courageous we will be!

Chairman
@isro
gave updates on Chandrayaan-2. We remain hopeful and will continue working hard on our space programme.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 02:53
by Primus
Proud of ISRO, regardless of outcome. Great to have come within a few inches (in this context) of the ultimate goal. The orbiter remaining in orbit and still able to send data is in itself a huge accomplishment.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 02:54
by Gagan
BUCK UP ISRO !
You are our heros!

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 02:54
by AdityaM
Some Doppler plots of vikram trajectory
https://twitter.com/cgbassa/status/1170 ... 14624?s=21

Not sure what it is

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 02:54
by Gagan
What is the resolution of the Orbiter's cameras?

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 02:56
by Gagan
AdityaM wrote:Some Doppler plots of vikram trajectory
https://twitter.com/cgbassa/status/1170 ... 14624?s=21

Not sure what it is
Image

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 02:57
by juvva
Another reminder.... space is hard.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 02:57
by Amber G.
First - we will know soon enough what went wrong.
This BTW does not change a bit about how good ISRO is.
For perspective, IIRC NASA had something like 10 failures before Apollo 11's soft landing.
Modi, as always, showed a great leadership and yes, we can all be proud of ISRO.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:00
by arshyam
Press asked to wait 15 min for further updates

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:02
by Gagan
Now in serial order:
The kink in the Doppler curve of #Chandrayaan2Live Vikram lander shows that the landing burn started.
Image
The landing burn is progressing well!
Image
Another kink in the Doppler curve. The end of the rough braking phase.
Image
Uh oh.... the signals have disappeared...
Image

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:03
by Cain Marko
Iirc they had the speed down to 48kmps..

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:04
by VikramA
Let's hope chandrayaan 3 is announced as soon as possible with hopefully a rover having isotope heated unit as power backup

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:06
by Gagan
If they get the first stage semi cryo engines from Russia, they can do it, but validating the rocket will take several development flights.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:10
by Gagan
X band from the Lander:
Image

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:12
by Gagan
Nothing on the X band per the poster above

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:13
by Gagan
The final telemetery is snake like, possible tumble.

VIKRAM HAS LANDED ON THE MOON. The question is if it has soft landed? Or Hard Landed?

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:16
by Suraj
A hard landing would probably show up as a dust cloud and debris field from the orbiter. No information as yet about what the orbiter has seen so far.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:17
by Mort Walker
Gagan wrote:X band from the Lander:
Image
The red dot is 3dB higher. Need to look at it with a narrower resolution bandwidth if possible.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:18
by Gagan
If they get pictures, will they have the heart to release the pics?
It is like their baby, they nurtured it to this stage :(

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:18
by arshyam
Gagan wrote:Nothing on the X band per the poster above
What does that mean? Just no comms?

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:19
by Dasari
How often Orbiter passes this site? It may not find anything until the dust settles.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:20
by disha
Gagan wrote:Final image:
Image
This deviation is where I gasped.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:23
by Mort Walker
If Vikram sent a picture when it switched into fine braking, we would know a lot better now.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:24
by Amber G.
Dasari wrote:How often Orbiter passes this site? It may not find anything until the dust settles.
It passes this site about every two hours (1 hr 55 minutes or so).

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:25
by SaiK
Gagan wrote:If they get pictures, will they have the heart to release the pics?
It is like their baby, they nurtured it to this stage :(
The advice is go by science and technology. Not emotions.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:26
by Gagan
The dust and debris will disrupt Comms? If it got too close to the moonsurface?

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:27
by SaiK
No saar. It should not disrupt communicating with the orbiter.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:29
by vnms
Who is that moron from the press that is yelling at the gentleman making an announcement? He was asking why the chairman was not giving the press announcement.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:29
by SaiK
The key data we have now is it lost comms ar 2.7km altitude.

Something went wrong in decision phase to land.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:30
by Gagan
Momentarily it might, if the debris is too much, but not for this long

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:30
by Gagan
Pallav Bagla shouting loudly ...
I tell you these NDTV walas !
They will always slip in a question about poor country, what is the justification for space program, and now shouting loudly about ISRO tradition.

ISRO asks presstitutes to leave the ISRO campus ASAP

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:31
by Dasari
SaiK wrote:The key data we have now is it lost comms ar 2.7km altitude
I think 2.1km.That is what the chairman said.

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:31
by SaiK
Typo. Sorry

Re: Chandrayan-2 Mission

Posted: 07 Sep 2019 03:32
by shaun
Why communication went off at 2.1 km altitude ?? An explosion ??