Bharat Rakshak

SSSalvi

iirc the apollo lunar missions used to execute a loi burn on the far side of the moon, but it looks like chandrayan_x missions execute the burn in radio visibility of earth. why the difference? Depends on the sight that you want to land on surface ... as well as specific requirements based on trans...

SSSalvi

Just for general info: Showing the significance of orbit attained. Ground path that the orbit takes while the CH3 is orbitting. Notice the Landing sight 'L' and the South pole 'P' ( Note: This is based on Planned orbit ... not on the achieved orbit. Will update when available including . How the sun...

SSSalvi

Amber G. wrote: ↑05 Aug 2023 19:20
Meanwhile
.NASA has reestablished full communications with Voyager 2. From 19.9 billion km into interstellar space, instructing it to turn its antenna back to Earth – and after 37 hours, it worked.

Great news fo the grey hair... Missed in the glare of CH3 .
Thanks

SSSalvi

Status as at 8PM IST https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcAkTK1RFFrGHV9kIjGULQicv3RzgFLrhTSgJq-pMzMarQRDVniw8eAn5HY5DwOaJCz2P1cemTYoln_HFvcAMgi5kzpVbQRZhNtXJPaZfIgBsoqaeqZlHY5Vp3oZddr_8FKhXLJ4Da_CiBqtl9m__L_1ybZLTKAoaMQn9WSlO3xXyQDEC-90Am99C-UjwI/s561/Status.jpg All seems to ...

SSSalvi

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 Lander is supposed to hover the South Pole of Moon .. so orbit around Moon has to be Polar, For dropping of Lander. Yes, It will be a Polar orbit. Rover will communicate with Lander. ...

SSSalvi

Just compilation of Max Velocity ( near perigee ) for each orbit Launch ( Earth Orbit insertion ) : 10.28 Km/sec After 1st Orbit raise burn : 10.31 Km/sec After 2nd ( Perigee Raising ) burn :10.31 Km/sec After 3rd Orbit raise burn :10.36 Km/sec After 4th Orbit raise burn :10.48 Km/sec After 5th Orbi...

SSSalvi

Continuing the topic in a slightly different perspective: 28 deg Earth inclination 6.7 deg Moon incl with Earth Now understand the significance of CH3 Launch inclination of 21.3 deg seen during Launch at 51:03 Time mark in https://www.youtube.com/watch?v=q2ueCg9bvvQ . Moon equator is tilted about 1....

SSSalvi

Why is CY3 orbit around the Earth an ellipse with the earth near one end of it? Viewing 3D orbits in 2D makes them very startlingly deceptive. Here are two viewes of the same instant of time ( near CH3 transfer to Moon instant ) when seen keeping in view Moon at centre in view and Earth at centre i...

SSSalvi

@ Disha
2nd image ( actually a GIF, you can click on it ) ,in Amberg post above, was captured by Telescope at Rotuz in Poland.

SSSalvi

Disha wrote: That is an example of ISRO public outreach/PR not up to par, or inversely proportional to their technical prowess. ISRO was proactively active ( even responding to comments in realtime ) during Mangalyaan mission. ( may be because one of my close associate was just transferred to take o...

SSSalvi

As per ISRO tweet:

The orbit-raising maneuver (Earth-bound perigee firing) is performed successfully from ISTRAC/ISRO, Bengaluru.

The spacecraft is expected to attain an orbit of 127609 km x 236 km. The achieved orbit will be confirmed after the observations.

SSSalvi

They don't have a dedicated handle onlee

SSSalvi

Dilbu asking??????

https://twitter.com/isro/

SSSalvi

^^^ It is not the technology that India has to depend on other countries , India has its own stations. As you can see in Image above India location does not allow communication over locations 3 and 4... so it has todepend on stations in that region. In fact these stations are used internationally by...

SSSalvi

Amber G: so CYII has to do some major change in orbit inclination once it starts orbiting the moon. FRom Shankar animation. Left Bottom corner. Already incorporated in planning .... https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEha_UAT--0O1J1YQF2mrlOLyzK3gkT2CFKynf2pLtNZX8dztLP-BL2KTqZTH...

SSSalvi

Amber G. wrote: ↑23 Jul 2023 11:11 so CYII has to do some major change in orbit inclination once it starts orbiting the moon.

Near Left Bottom in TLI orbit

SSSalvi

Best to just see this in terms of gravitational capture. CY-3 is passing close enough to the Moon, so that firing its rockets will slow it down enough to allow it to be captured by Moon's gravity. Forget about zooming out and seeing some larger trajectory map in relation to Earth. Once you start ge...

SSSalvi

Horizons is a sophisticated and accurate astro calculator. You could get output even upto 0.5 sec interval. It is your choice. All scientific and authentic. Shankar's ( or mine ) graphics were made days before CH3 was launched and they are accurately matching with actuals. I had made several educati...

SSSalvi

Wonder where he got the trajectory data ISRO ( and for that matter all responsible Space operators ) posts planned trajectories ( at least for non standard Launch activities ) on NASA's Horizons data base. https://ssd.jpl.nasa.gov/horizons/app.html#/ Upto Launch full program was available ( even La...

SSSalvi

To summarize, with CY3 moving away from 5th orbit apogee, the capture of CY3 in moon orbit happens somewhere in the range of 20000 to 40000 km above the moons surface? You are on dot! CH3 moves in Last earthbound orbit upto 30000 kms from Moon. Orbital velocity is already as low as about 0.2 kms/s ...

SSSalvi

https://sankara.net/chandrayaan3.html A nice 3d fine grain rendering by Shankar brings out the details ( My diagram is a coarse rendering. ) The inflection due to Moon is clearly seen. https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqzabSulVH9FFI6W4yt47IzY6zlevydYkAEt-5SO1SOSCpo-xfSnIrh...

SSSalvi

In case of Earth-Moon pair The L1 distance from earth centre is 323050 Kms.( 316672 kms above Earth. ) For TLI orbit Apogee is 362000 kms, way beyond L1. https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiT2Je9HhpEANmkPMeqRR-1euPpbq_-s-RnLm1iHl2ytGFqewrTsnKOurY-3IiFCYeB2mmINgMZPfGi0GJjoP1PL...

SSSalvi

That '90 deg turn' is not by rocket motors. Actually after the Lagrange1 distance ( it is the distance between Moon and Earth in this case ) which is an equi-potential type of situation where the gravitaional forces of Earth and Moon are equal and depending on whether thw satellite is in Moon Gravit...

SSSalvi

I wanted to tabulate for my reference. Doing it now. 1st Burn : July 15 06:47 UTC 41762 km x 173 2nd Burn : July 16 41603 km x 226 THis seems to be unplanned so confusion .... To raise Perigee from 173 to 226 3rd burn : July 17 51400 km x 228 km 4th Burn : July 20 71351 km x 233

SSSalvi

No, You have to do some more waiting. Apogee now about 71000 Kms, Period 1 day. At the end of 4th such orbit next Orbit raising to about 127000 kms apogee, 3+ days orbit period. There will be 3 such orbits after which the actual transfer orbit will start. So another 7 orbits for TLI orbit. Transfer ...

SSSalvi

Just for fun! 1st Image : Part of Earth orbit ( Light Yellow ) and Moon ( Green ) during initial period of Ch3. 2nd Image : Orbit raising period track of CH3 ( Pink ) https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXO5ElUtmgFzIOuVzug5R-p8P20Iz-Wmtrm-Iq7d_IVy5C1ZhMAbfE7M5XayLLukMDTQWzPzNO...

SSSalvi

where did you get the TLE data from? is ISRO publishing it anywhere? The standard source : CElestrak You have to make a special data request for the date range of any sat to them... reply comes within a day. ISRO will never divulge their 'secrets' of data base .. and they have a right to do that. B...

SSSalvi

@Madhu Here is a set of TLEs , if it helps CHANDRAYAAN-3 1 57320U 23098A 23195.17804341 .00000480 -64874-6 00000+0 0 9994 2 57320 21.3150 8.8322 7350849 178.0282 188.8377 2.24991467 04 CHANDRAYAAN-3 1 57320U 23098A 23195.17845806 .00000480 -64965-6 00000+0 0 9996 2 57320 21.2842 8.8622 7354357 177.9...

SSSalvi

ISRO tweeter has just written the orbit size ( that too after someone commented for it !). It does not serve the purpose of those who do detailed computation. A few more hours to get the full details. But of course for the majority , the given info is good. BTW, nice presentation about CH3 descent,M...

SSSalvi

^^^
Heavens Above is using data of 17 July 2023 20:50:24 UT.
Latest data to generate new orbit is still not in public.
I , like many others , is checking for updates every hour

SSSalvi

https://www.youtube.com/watch?v=hP0GbRNGMLk&t=1s They said that as the lander descended, the attitude deviations ("errors") began accumulating faster than expected, necessitating larger sharper corrections by the thrusters. At the same time, there was a bug in the software that manife...

SSSalvi

Late as usual.
( Actually I was regularly getting message that this is a scam site and can't be opened ... for last few years. )

It ( MOM ) really was a great achievement and we had one of the most fascinating discussions here.

SSSalvi

^^^
Thanks for the HUGE 9 update Gagan ji ! ! !

Looks like it is going to be electrocuted by the power lines ahead....

SSSalvi

Relative velocity is actually a combination of Velocity vectors in all three directions. SQRT(Vx^2+Vy^2+Vz^2). They have not continued the telecast after CUS failure so not much is visible about after abort. Here is a screen grab from GSLV D3 launch video dtd April 15, 2010 which shows the situation...

SSSalvi

Velocity increase is due to Mr. Gravity pulling it.
Had there been an ignition there would have at least a fraction of second at the time of CUS ign where increase in altitude would have been seen.
Instead we see a DeadBird fall phenomenon

SSSalvi

Happy Birthday to ISRO. ISRO was formed on the Independence Day of 1969. Prior to that the Space activities were looked after by Indian National Committee for Space Research (INCOSPAR) established in 1962 by the efforts of Prime Minister, Jawaharlal Nehru, and his close aide and scientist Vikram Sar...

SSSalvi

Conspiracy theorists talk of Falcon 9. The website lists falcon 9 twice. Once as : (DragonSat + Falcon 9 )in 2010 and 2nd time as (CUSAT + Falcon 9 ) in 2013. Surely you cant have same rocket launch twice. So one ( probably 2010 ) could be a 'silent' launch then. But both are listed. Ignore last st...

SSSalvi

2 days over .. the website that reports any identified orbiting object is silent on GSLV R/B ( GSLV Rocket Body ). As discussed by the learned learned forum here, the body is at the bottom of Bay of Bengal. You can see the uneasy change in the body language of Control room crew when they reappear ( ...

SSSalvi

Have they downgraded the bloody dog fights that used to take place in Review Meetings prior to any major event by 'that' pre '84 and pre '95 gang? There used to be fights in meeting hall and 'Aur Kaise ho yaar?' talks after meeting by those same fighter cocks. If the modern management technology dis...

SSSalvi

^^^
Sun has risen.. CH2 Orbiter passed over near Landing site on 9th,10th and also today.
But ISRO is MouthShut.

Irony is , We will definitely see coverage of area in public space through NASA LRO around 15th,16th,17th.

BTW what purpose will the image of a debris will serve?

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