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Chandrayaan-3 Soft-landing [video]

isro.gov.in

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Re: Chandrayaan-3 Soft-landing [video]

#121

Post by MPSimmons »

The_Colonel wrote: post #28
jvm___ wrote: post #12

Scott Manly has a video on why he thinks the last one failed. It sounds like their landing software didn't have "oh crap, we're way off course, just land wherever". It only had the happy path of "fly to here and land", so when it switched to the landing phase it tried valiently (including flying upside down) to try to fly back to the landing zone, but the landing zone was much further than fuel supplies allowed. Hope…

Not considering such a basic error condition seems like a gross omission. This can't even come from the software engineering, but must be some kind of managerial failure (e.g. we're short on time, but have to report great progress to my boss, so skip this scenario).

Out of curiosity, how many space programs have you been involved with?

Re: Chandrayaan-3 Soft-landing [video]

#122

Post by taneq »

thyrox wrote: post #47

Not asking rhetorically but why is this a big deal? Is it because it's going to the south pole? What are some other benefits to be gained from this?

They've made a controlled landing on the moon. Just because it's been done a few times before, ever, doesn't make this a small accomplishment.

Re: Chandrayaan-3 Soft-landing [video]

#123

Post by hoseja »

whoknowswhat11 wrote: post #106
confuseddesi wrote: post #75

It’s landed! Congratulations to India on this great achievement!

Why such a long political speech and no views from onboard camera?

You can see the onboard camera view in the background sometimes. And the only truly hard thing about this is getting the political will for the funding, so.

Re: Chandrayaan-3 Soft-landing [video]

#124

Post by ape4 »

whoknowswhat11 wrote: post #106
confuseddesi wrote: post #75

It’s landed! Congratulations to India on this great achievement!

Why such a long political speech and no views from onboard camera?

So many words about "success" - how about some goodies?!

(To be clear, I am happy for India, just think it could be presented better)

Re: Chandrayaan-3 Soft-landing [video]

#125

Post by dirkc »

the-dude wrote: post #109

I saw the onboard camera show movement after the celebrations started. Did anyone else see this? The onboard has not been shown since.

This happens a lot to me in KSP, the lander tends to slide all the way to the bottom of the slope. Most of the time it's okay, just need to tweak the dampeners on the landing legs a bit ;)

EDIT: I went to re-watch the moment on youtube and it does seem like the lander moves slightly to the left!

Re: Chandrayaan-3 Soft-landing [video]

#126

Post by hoseja »

m0llusk wrote: post #86
jvm___ wrote: post #12

Scott Manly has a video on why he thinks the last one failed. It sounds like their landing software didn't have "oh crap, we're way off course, just land wherever". It only had the happy path of "fly to here and land", so when it switched to the landing phase it tried valiently (including flying upside down) to try to fly back to the landing zone, but the landing zone was much further than fuel supplies allowed. Hope…

If anything they seem to have overcorrected for this. This landing path stopped with a near hover at around 800m, then a prolonged hover at 150m while the lander scoped the situation, then an extremely slow descent that allowed for corrections the whole way down. Very impressive.

Also incredibly inefficient.

Re: Chandrayaan-3 Soft-landing [video]

#128

Post by shri_krishna »

whoknowswhat11 wrote: post #106
confuseddesi wrote: post #75

It’s landed! Congratulations to India on this great achievement!

Why such a long political speech and no views from onboard camera?

> Why such a long political speech

ISRO is primary arm of the Department of Space which is headed by the Prime Minister. So in essence, the Prime Minister is the boss. It is not an independent federal agency like NASA.

Re: Chandrayaan-3 Soft-landing [video]

#129

Post by shivdeepak »

the-dude wrote: post #109

I saw the onboard camera show movement after the celebrations started. Did anyone else see this? The onboard has not been shown since.

That's probably because the image data being larger than the on-board sensor data would take longer to reach earth, thus the latency.
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