Chandrayaan 3: Launch and Discussions

fanne · Post by **fanne** » 23 Aug 2023 18:25

A_Gupta wrote: ↑23 Aug 2023 18:24 What was the vertical landing velocity of the lander? Was it the nominal 1 meter/sec or was it at the higher end towards 3 meters/sec?

What was the horizontal landing velocity of the lander?

Wondering the same

Rakesh · Post by **Rakesh** » 23 Aug 2023 18:25

hnair wrote: ↑23 Aug 2023 18:21 Turns out we can and we did

+108!!!

Cyrano wrote: ↑23 Aug 2023 18:22 Great so see many, so many women - "Bharatiya Naaris" in this CY3 team ! While the rest of the world keeps talking about this and that, India just simply does it in every field that matters. Bharata Naari ki jai !!

So true! India's real heroes...

https://twitter.com/IndiaHistorypic/sta ... 41340?s=20 ---> Scientists of @isro

Cyrano · Post by **Cyrano** » 23 Aug 2023 18:26

Last few seconds DD switched to some close up shot and we could not see real time Hv, Vv and Alt data. Hope DD does a better job when we see the next landings on Mars and Venus.

Mukesh.Kumar · Post by **Mukesh.Kumar** » 23 Aug 2023 18:27

Jai Hind.

Now to get to the serious Science stuff and stake our territorial rights on the moon.

Hoping in the same breath that we will also stake our territorial rights on the chanda to our west soon

Najunamar · Post by **Najunamar** » 23 Aug 2023 18:30

Horizontal was quite low 0.002 m/s or something, vertical was a bit more I think, even then 3 m/s is around 7 mph not even a fender bender!

SriKumar · Post by **SriKumar** » 23 Aug 2023 18:30

^^^ The velocity value kept changing up and down, and the camera was not pointed at the screen, so we dont know for the exact moment.

However, the important thing is that hover was achieved several 100 meters above the lunar surface, which means that the craft was under full control and behaving normally. So I am pretty sure the landing speed was within parameters per mission.

3 m/s is the upper limit of the design and becomes borderline. Mission parameters would have called for a much lower value as optimal landing velocity.

ramana · Post by **ramana** » 23 Aug 2023 18:32

Congratulations!!!!
India broke the sixth country syndrome.
First country to land near South Pole of the moon.

President Kalam wrote he wanted to break the 'sixth' country syndrome. Every achievement has the blurb. "India is the sixth country to do this, blah, blah..."

sanman · Post by **sanman** » 23 Aug 2023 18:36

Chandrayaan-3 Makes Historic Touchdown on the Moon

India becomes the fourth country ever to land a spacecraft on the moon

Chandrayaan-3 makes space history

Cyrano · Post by **Cyrano** » 23 Aug 2023 18:39

Agree Ramana ji, India should also get out the "shoe string budget" mindset to forever bury the sixth country syndrome. Big achievements need and deserve big budgets.

nitzter · Post by **nitzter** » 23 Aug 2023 18:40

A_Gupta wrote: ↑23 Aug 2023 18:24 What was the vertical landing velocity of the lander? Was it the nominal 1 meter/sec or was it at the higher end towards 3 meters/sec?

What was the horizontal landing velocity of the lander?

I saw it sustaining at around 1m/s for the last part of the descent.

juvva · Post by **juvva** » 23 Aug 2023 18:41

when can we expect post landing images from the lander cameras?

Anurag · Post by **Anurag** » 23 Aug 2023 18:41

When does the rover get deployed?

SSSalvi · Post by **SSSalvi** » 23 Aug 2023 18:43

Happy for the Safe Landing.
Late because was on a panel discussion about landing.
Great achievement for India.
Want to see the Rover sliding dow the ramp, saying ... Mai aya hoon!!!

juvva · Post by **juvva** » 23 Aug 2023 18:44

time to revisit the landing video and savour again and again and again...

drnayar · Post by **drnayar** » 23 Aug 2023 18:44

We need a picture of the Indian flag on the dark side of the moon

.. oh how that picture would sell !!

SSridhar · Post by **SSridhar** » 23 Aug 2023 18:46

Awesome !

Waiting for the Next Sequential Steps in Progress, such as Pargyaan sliding down, roving, doing the tests and Vikram doing its own.

It would also be great if the two can survive the Lunar night and come back roaring after that.

The whole launch all the way to the landing has been extremely precise as shown by the PM being left with a lot of fuel and the copybook soft landing.

SSSalvi · Post by **SSSalvi** » 23 Aug 2023 18:47

^^^
AI use karo .. Land wherever you want, in picture.

fanne · Post by **fanne** » 23 Aug 2023 18:47

The last visuals from ISRO official @59.27 minute mark reads this - (all within tolerance limit) -

Height/Altitude left to be covered - 19 Meters, Vertical velocity = 1.584 m/s and horizontal velocity = .225 m/s

After that it simply landed.

SSSalvi · Post by **SSSalvi** » 23 Aug 2023 18:49

Yes, That was confusing.

SriKumar · Post by **SriKumar** » 23 Aug 2023 18:49

mission parameter's upper limit on landing speed was 3 m/s meaning it would survive.
Optimal value for landing speed would be much lower....not published.

Sagrawal · Post by **Sagrawal** » 23 Aug 2023 18:50

A_Gupta wrote: ↑23 Aug 2023 18:24 What was the vertical landing velocity of the lander? Was it the nominal 1 meter/sec or was it at the higher end towards 3 meters/sec?

What was the horizontal landing velocity of the lander?

ISRO chief mentioned landing speed was far less than 2 m/s

Cyrano · Post by **Cyrano** » 23 Aug 2023 18:52

ISRO chairman Somanath speaking to the press at the moment on DD live.

drnayar · Post by **drnayar** » 23 Aug 2023 18:52

want this next !

source : https://elements.envato.com/astronaut-p ... on-V6FH3EM

Rakesh · Post by **Rakesh** » 23 Aug 2023 18:52

What a wonderful way to describe ISRO!

https://twitter.com/_Reincarnate/status ... 43495?s=20 --->

Kati · Post by **Kati** » 23 Aug 2023 18:54

Bangladesh gave wide coverage of the moon landing. How are the other neighbors reacting?

la.khan · Post by **la.khan** » 23 Aug 2023 18:59

Congrats to ISRO, BRF, SSSalvi, Amber G., and others I don't remember. And, most importantly, Dilbuji just for showing up in the nick of time

Now, is there a thread that has all the rona dhona from the usual suspects (liberals, p@kis, Bri$hits, western media etc)? Wish to enjoy that with a topping of schadenfreude

nitzter · Post by **nitzter** » 23 Aug 2023 19:02

SriKumar wrote: ↑23 Aug 2023 18:49 mission parameter's upper limit on landing speed was 3 m/s meaning it would survive.
Optimal value for landing speed would be much lower....not published.

2 m/s or lower was deemed very safe for CY3.

For CY2, this value was equal to or lesser than 1 m/s, as far as I can recall.

ashthor · Post by **ashthor** » 23 Aug 2023 19:03

Congratulations ISRO and to the Nation.

Dilbu · Post by **Dilbu** » 23 Aug 2023 19:04

When will DD learn to focus on important things while covering such events. Sigh.

nitzter · Post by **nitzter** » 23 Aug 2023 19:06

Waiting for more images and videos to come out... Hope ISRO posts the soft landing video, with lunar dust flying off. That would be cool on another level.

nitzter · Post by **nitzter** » 23 Aug 2023 19:07

Dilbu wrote: ↑23 Aug 2023 19:04 When will DD learn to focus on important things while covering such events. Sigh.

Very true Dilbu ji.

Visuals were often very different from the commentary. Also, the touch down data was missed out

juvva · Post by **juvva** » 23 Aug 2023 19:09

nitzter wrote: ↑23 Aug 2023 19:07
Dilbu wrote: ↑23 Aug 2023 19:04 When will DD learn to focus on important things while covering such events. Sigh.
Very true Dilbu ji.

Visuals were often very different from the commentary. Also, the touch down data was missed out

also the feed from landing camera was missing at touch down moments.

VickyAvinash · Post by **VickyAvinash** » 23 Aug 2023 19:17

Congratulations to ISRO. Jai Hind. Very proud moment to be first to land on South Pole of moon.

juvva · Post by **juvva** » 23 Aug 2023 19:18

any basic post landing status updates ?
like:
-orientation, power generation from solar panels?
-ground tilt angle if any ?

dkhare · Post by **dkhare** » 23 Aug 2023 19:21

Jai Hind! Bharat Mata ki Jai! Congratulations ISRO! Congratulations to the Nation!

I think the live video feed will be uploaded through the Deep Space network and will be made available soon. I don't recall if it was going to be a live video feed of the landing but there were time-lapsed pictures being beamed back where you could see the smooth landing zone just below the lander as it descended and went into hover mode.

SBajwa · Post by **SBajwa** » 23 Aug 2023 19:26

Congratulations to ISRO!!

Dilbu you rock! Thank you.

SriKumar · Post by **SriKumar** » 23 Aug 2023 19:35

The real work for the ISRO engineers is just beginning. They are checking parameters on the rover to see if it survived the landing well and powering up its systems and checking system parameters. Rover will be working for the 14 days and nights and preparations for that are probably underway. If PRagyaan goes through this entire timeframe without a hitch, then a ton of pictures and scientific data will come our way.

BIggest thing they are probably looking at pictures in front of the lander Vikram and whether it has clear space to roll out a ramp so PRagyaan can come out smoothly. (My speculation: if this is not possible and there is boulder in front of Vikram, the 'hop' of the lander that people were speculating about might come sooner, but this is pure speculation).

sanjaykumar · Post by **sanjaykumar** » 23 Aug 2023 19:43

Small step for India giant leap for South Asia.

juvva · Post by **juvva** » 23 Aug 2023 19:45

k. sivan's post landing interview:

https://www.youtube.com/watch?v=QzATx541Sa0

sanman · Post by **sanman** » 23 Aug 2023 19:48

The decision on when to deploy the rover will be taken today: