Bharat Rakshak

prasannasimha

Excellent! What would be the challenge of detaching the Vikram lander from the main orbiter, vis-a-vis more or less the same operation on the moon impact probe( MIP) onboard Chandrayaan-1? Is it just a question of more bolts to be sheared, or not even that? Vikram must not collide with the Orbiter ...

prasannasimha

Amber G, ISRO is known for what it has achieved. So are the isotopes the only way to get power? I understand the power source has to be light in weight. So I am not wondering why we not have a giant battery pack. Battery has to be recharged and where and how will the recharging happen = from Solar ...

prasannasimha

The radioisotope thermoelectric generator was never designed for CY2. Typical source would be Pu238. Why wasn’t it used I don’t know, perhaps the implantation would change the design and make the GSLV-III payload heavier. Or cost would go up beyond what was sanctioned in the budget. From what I kno...

prasannasimha

After separation why wait for Sep 7th? Is not the orbital position to commence the soft landing not achieved earlier than 7th? My layman's brain thinks the lander carrying the rover would complete more than on revolution in 4 earth days.... I know I am missing something very basic. This has been di...

prasannasimha

S^3 In such planetary travel/orbits 1km off is important no? Perigee/apogee distance and minor variation here is not important. What's important is the orientation (inclination of the orbit) and phase (= timing -- where CY2 is at one particular point in the orbit relative to ground) so that final V...

prasannasimha

ramana wrote:AmberG, Thanks for the explanation .
Its the corkscrew path to get there.
That accounts for the minor 1km variation in orbits achieved.

S^3 In such planetary travel/orbits 1km off is important no?

Not really corkscrew. they are ellipses that are marked in space time to get a corkscrew

prasannasimha

The US Navy has run into problems with touch screens in some of their naval ships and they are now rethinking of going back to push button type. They had a ship collision recently because the jing bang touch screens failed to respond.

prasannasimha

Not everything in military and space engineering is the latest or most efficient but often most reliable or time tested.For eg the processors for both space missions and military are slower than the fastest chips available(in fact many times slower) but things like radiation hardening etc etc are mo...

prasannasimha

It was this - Cheaper and lighter: 'Made in Gujarat' spacesuits to be used in Gaganyaan. The countdown to India’s ambitious manned spaceflight mission Gaganyaan has begun and Isro scientists are at breakneck speeds to achieve the mission’s December 2021 deadline. India’s indigenously developed astr...

prasannasimha

Nag has been used before as per baba

prasannasimha

Varoon Shekhar wrote:I remember reading that a spacesuit was already made several years ago. Maybe they want more, or to try a different kind?

Technically it is a flight suit and not a space suit for EVCA.
More than that Russian collaboration is required for various training procedures etc.

prasannasimha

Tenders for SC120 (from IPRC) continue to flow. This jingo is very happy! If you see the budgetary allocation of semicryo engine there are two budgetary allocations of interest = one is the semicryo itself and the other is for clustering of semicryo engine. Other interesting allocations are for spa...

prasannasimha

There are Doppler Inertial navigation systems and star sensors that are used for navigation

prasannasimha

From the calculations that I made (and I may be wrong about it) the Orbiter high resolution camera is 11,25,00,000‬ pixels from my calculation = 21.45 Megapixel camera and resolution of 0,32 meters Terrain mapping camera From ISRO website TMC 2 is a miniature version of the Terrain Mapping Camera us...

prasannasimha

Orbital inclination changes are typically done at the ascending or descending nodes or at intersection of current and desired orbit

prasannasimha

Varoon Shekhar wrote:Is that correct, about the recent pictures coming from the Vikram lander? The lander is not described as having an optical camera. It has 3 other type paylods. Do they mean the Orbiter?

The images are from the orbiter

prasannasimha

Varoon Shekhar wrote:Is that correct, about the recent pictures coming from the Vikram lander? The lander is not described as having an optical camera. It has 3 other type paylods. Do they mean the Orbiter?

No it is from the orbiter

prasannasimha

To get to the Lunar Transfer Trajectory, Chandrayaan-2 gradually increased the apogee using Oberth Effect via LAM firing at the perigee. I understand that. Now, couple of questions: But once around the orbit of the moon, to decrease the apogee and get to a more circular orbit, does the LAM fire at ...

prasannasimha

Talked to an actual space engineer and the three body problem and involvement of Lagrangian points are not used except for actual missions to Lagrangian points. The ellipse assumption is enough for modeling for lunar missions

prasannasimha

Mort Walker wrote:
juvva wrote:114 km x 18072 km -achieved
vs
118 km x 18078 km -planned

WOW !!!!!
Most excellent!!!!

That's a sigma of 4.505 for apogee

prasannasimha

sivab wrote:SCE-200 is a staged combustion engine.

Yes indeed I was referring to a full(LOX LH2 staged combustion engine that requires full engine firing. . In a semicryo you can hot test certain portions for eg till preburner.

prasannasimha

One advantage of nonstaged combustion is portions of engine can be separately tested before full firing

prasannasimha

SC 200 partial engine hot test will be done sometime shortly till test stand is fully constructed. The engine perse would have been designed but full testing cannot be done till the test stand is completed

prasannasimha

NORAD ID: 44441
Int'l Code: 2019-042A
Perigee: -1,193.5 km
Apogee: 404,883.5 km
Inclination: 21.8 °
Period: 15,759.1 minutes
Semi major axis: 208215 km
RCS: Unknown
Launch date: July 22, 2019
Source: India (IND)
Launch site: SRIHARIKOTA (SRI)

prasannasimha

NORAD ID: 44441
Int'l Code: 2019-042A
Perigee: -1,193.5 km
Apogee: 404,883.5 km
Inclination: 21.8 °
Period: 15,759.1 minutes
Semi major axis: 208215 km
RCS: Unknown
Launch date: July 22, 2019
Source: India (IND)
Launch site: SRIHARIKOTA (SRI)

prasannasimha

deleted

prasannasimha

https://www.n2yo.com/?s=44441 shows the previous ground track so they did do an inclination change with the last earthbound maneuver

prasannasimha

Is the point on the Pacific where the descending node point is ?

prasannasimha

Thanks. I was a bit confused seeing it heading to the middle of the pacific whereas the 3D animation on Satflare showed the perigee it over Peru like you said. Moons orbit is around 5.1 Deg to ecliptic so they will need an inclination change too ? https://upload.wikimedia.org/wikipedia/commons/thumb...

prasannasimha

Got to recheck where the groundtrace of perigee point is. Is it over middle of Paciific ocean or over South America ? Seeing the ground trace it looks like over middle of the Pacific Ocean.

prasannasimha

TLI at 3-4 AM IST

prasannasimha

https://pbs.twimg.com/media/EByDtBNUYAA_DXm.jpg Chandrayaan has crossed its apogee and now swinging back for the TLI burn on August 14th at 3 -4 AM TIME Mon, 12/08/2019 21:50:22 Latitude [deg] 2.08 Altitude [km] 143451.5 DEC J2000 [d:m:s] 1:26:05 Sun El.[deg] -42.8 (Deep Night)(UTC) Mon, 12/08/2019...

prasannasimha

^^ Policy formulator is Modi Doval/Shah are the executors of the policy on the ground Think Tank Vivekanand Foundation under Doval, Maj. General Bakshi , Col. RSN Singh and Pushpendra kulshrestha formulated policy. Last year 21 October Red Fort Flag ceremony was triggered by these 4 meeting Modi an...

prasannasimha

"Ek desh mein do Vidhan, do Pradhan aur Do Nishan nahi chalenge" (A single country can't have two constitutions, two prime ministers, and two national emblems)

This was said by Shyam Prasad Mukherjee in 1952

prasannasimha

That was control room and burn placement

prasannasimha

351 Ayes 72 Noes and 1 abstains
J and K reorganization bill passed with 2/3rd (83%) majority in both LS and RS !

prasannasimha

prasannasimha

^^^^ Actually not quite true. 370 is more nuanced and very complicated. I dont claim to be an expert on it. … … All in all a kichdi manoeuver. Let's see if it stands the test of the courts. Courts can't do much. The AP reorganization bill is still in Supreme Court. Harish Salve on NDTV explained it...

prasannasimha

As far as EP propulsion goes let it be clear - you cannot beat physics and momentum = mass X velocity and current "regular" fuels have an ISP of max approx 450. However they have one great advantage they provide enough thrust in short period of time to allow us to escape earth. No ion engi...

prasannasimha

sanjaykumar wrote:Why not use a modular approach and boost assets separately into orbit? Assemble by docking finally orbiting astronauts in a module that can orbit the moon and also return to earth.

That is Indias plan 2 rockets with earth rendezvous for docking TLI and lunar orviting and descent

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