Bharat Rakshak

nitzter

juvva wrote: ↑10 Sep 2023 11:25 ^ lunar eclipse at 0:35 s ??

Solar Eclipse brother.

When we have a lunar eclipse, moon dwellers would have a solar eclipse...

nitzter

Plotted in a Sun centric view for Sept 23 to Feb 24 period. Yellow Dot is SUN... White Curved line is Earth orbit around Sun ... Blue line is the path of L1 .... Multi coloured line is path of AdityaL1 .. Each colour depicts one month period. Highly appreciate this... Always wanted to view the comp...

nitzter

SSridhar wrote: ↑02 Sep 2023 13:16
nitzter wrote: ↑02 Sep 2023 12:47 We need more stations - ground or ship based. Dark periods are nail biting.
Additionally, we should start building Tracking & Data Relay Satellites (TDRS). Already two TDRSs are being made to be in place to support Gaganyaan.

Any timeframe out for these two satellites?

nitzter

phew !!!!! how i wish dd doesn't leave us in the dark on tenterhooks in the middle of a mission, the discussion could have waited... that to on a day on which dilbu has taken day off. Hahaha... I agree they should have at least flashed the latest updates at the footer of the screen. People unaware ...

nitzter

sanman wrote: ↑02 Sep 2023 15:18
But this same ordinary-looking rocket booster ("test vehicle") has also been made to later eventually be used for testing something else.
Can you all guess what that is?

Is it the RLV?

nitzter

Injected into a very good orbit - 233x19470 (235x19500 desired).

nitzter

We need more stations - ground or ship based. Dark periods are nail biting.

From altitude trajectory it appears as if the PS3 solid motor over performed. Although the feedback based burn was later managed by PS4...

nitzter

Signal re-acquired!

nitzter

Altitude showed deviation. Range director announced PS4 burn sequences would change, right?!

nitzter

SSSalvi wrote: ↑01 Sep 2023 21:13 AdityaL1 Launch Kit doc is out!!!!

Now SRF should start new thread.

https://www.isro.gov.in/media_isro/pdf/ ... ochure.pdf

Very interesting PS4 burn sequences 15 and 42 minutes after PS3 cutoff... With a lighter payload, it is behaving like a propulsion module.

nitzter

Low angular radius and monthly station keeping - thanks Amber ji.

While I have a basic understanding of the Lagrange points, there is almost no information out there about the final orbit of the observatory.

nitzter

As the lander retargeted and landed on a different spot, there would be little fuel left in the tanks. Hypothetically, if some fuel was left in the tanks would it be a good idea to fire the engine and move to another location where there is daylight available? Then we can get 28 days of continuous ...

nitzter

Any reference on how AdityaL1 will communicate with Earth , considering that the big Noisy Sun disc is always behind the satellite? (Apart from great distance there is a constant big noisy Sun behind .) Aditya or any spacecraft at the (L1) position face unique communication challenges due to the pr...

nitzter

^^ interesting. The man does not say that his god is bigger than all and he works for his glory. He states that he comes to a temple to explore. What a refreshing contrast between the frank idiocy of revealed religions and this. But in India one has to apologise for this paganism lest it offend you...

nitzter

chetak wrote: ↑27 Aug 2023 16:28 some things never change

the venom of the commies and urban naxals....

Let's not give any footage to these sort of individuals. They only crave attention with such remarks...

nitzter

Minister of space - Ahead of the human spaceflight, scheduled for the second half of 2024, top scientists are working on an unmanned mission in September this year and later a mission mimicking humans through a robot early next year. The female robot has been named Vyomamitra. Links - https://www.tr...

nitzter

Mass differs from weight; a 100 kg mass on Earth remains a 100 kg mass on the Moon. (Hint: In orbit, everything is weightless, but that doesn't mean you can carry an unlimited payload.) Newton's laws deal with mass, and for a given change in velocity (delta-V), the energy (fuel) required depends ha...

nitzter

Maybe I should have been a little more specific in my question - Q. Will the earth 'rise' and 'set' be the equivalent of waxing and waning of the earth, but will always be overhead (for a person on the moon's equator)? Q. Also during a lunar day, will the person on the moon will be (primarily) seei...

nitzter

Ashokk wrote: ↑24 Aug 2023 19:47 https://twitter.com/isro/status/1694713817916473530

Lander Imager camera video from ISRO

The wait is finally overrrrr!!! Thanks Ashok ji.

PS - They could have shown a few more seconds of video after touchdown - the dust settling part.

nitzter

Q. Will a satellite in a large elliptical orbit around the earth be within line of sight of the far side of the moon (even a partial amount of the far side) or is the Langrange point the only spot that can provide line of sight to both the earth and moon? Thanks. Appreciate your knowledge sharing a...

nitzter

I think the coolest bit was it reselecting the target landing spot after the initial one was deemed not good enough. Need more details on this, should be an interesting anecdote As Disha ji pointed out - fully automated. May be the rough braking could be done manually, sitting here on Earth, even w...

nitzter

Also, our autonomous landing capability will be even more crucial during the mars landing mission as the time delays then would be far exceeding the 3s latency in the case of moon. We’re blessed to be witnessing a lot of records from ISRO with more to come. True, in a sense. However, Mars landing i...

nitzter

hanumadu wrote: ↑23 Aug 2023 22:55 Does the lander have only one camera? All the images seem to be from only one camera.

Gareeb Scientist has explained pretty well about CY3 cameras in this video - https://youtu.be/YACrdRXYLgs

nitzter

Rakesh wrote: ↑23 Aug 2023 22:02
siddhu wrote: ↑23 Aug 2023 21:43 Rover is rolling down.
https://twitter.com/GoenkaPk/status/169 ... 44743?s=20 ---> First photo of Rover coming out of the lander on the ramp.

You beat me to it while posting this pic

looks so beautiful.

nitzter

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. The ISRO official youtube channel did similar - switched to PM Modi in the last 30 seconds or so of the landing. This is ...

nitzter

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

nitzter

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

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.

nitzter

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.

nitzter

Rakesh wrote: ↑23 Aug 2023 18:17 https://twitter.com/AdithyaKM_/status/1 ... 90344?s=20 ---> Show me K Sivan-ji smiling goddammit. The mission ain't over until that happens.

Yes maybe they can call him to the podium!

nitzter

Congratulations to us all. Flawless journey of CY3...

nitzter

Great simulation. A quick question. Is CY3 supposed to be in a polar orbit. From the vid, it does not look so. Or I might be mistaken Draw a straight line from CY3 to the centre of the moon and fix the observer at a set distance away from the moon on that line. You will get the perspective this vid...

nitzter

In my opinion ISRO is optimising for costs rather than payload as they probably have a curve where it makes more sense to do so given the falling prices for payload in the launch market. SpaceX uses maraging steel as well. Whatever it is, we have to think of booster reuse sooner than later to reduc...

nitzter

So our participation with ISS can be like how our experience-building thru INS Chakra helped us prepare for our own N-sub? I wonder if we'll have another "Sare Jahaan Se Accha" PR quotation exercise from this? I think it would be a nice gesture if an Indian capsule could dock with ISS -- ...

nitzter

Why are we still using maraging steel for the S200 solid rocket boosters? Can composite rocket motors be developed for the same? We have now have composite rocket motors for the Agni-5. If the S200 can be made with composites, the weight would reduce and the obvious benefit would be a higher payloa...

nitzter

Why is CY3 orbit around the Earth an ellipse with the earth near one end of it? Raising to a higher perigee (near earth point) orbit would be a waste of fuel. Idea is to keep raising the apogee until it come near the moon... Once CY3 crosses the Earth-Moon Lagrange point (at around 3.20 lakh kms), ...

nitzter

So there's a little bit of a window for us to fly and dock there, if we were all inclined towards this. Remember that China will be operating its own new version of ISS during this time. Pakistani & NorthKorean astronauts will likely be ferried to the station by China. Indian flights to ISS cou...

Bharat Rakshak

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