Bharat Rakshak

juvva

Gerard wrote:

WOW, this is way better than DD broadcast.

juvva

Prasad wrote:Sat put into orbit.

+ all customer sats released.!

juvva

https://www.isro.gov.in/update/11-dec-2019/pslv-c48-risat-2br1-filling-of-propellant-second-stageps2-of-pslv-c48-completed Dec 11, 2019 PSLV-C48/RISAT-2BR1: Filling of propellant for the second stage(PS2) of PSLV-C48 completed. Dec 11, 2019 PSLV-C48/RISAT-2BR1: Filling of fuel for the second stage(P...

juvva

all nano sats seperated.... mission completed!!!

juvva

Cartosat, meshbed seperated....

juvva

x-posted from Chandrayaan subject One of the PSLV flight was doomed because a nozzle of engine was 1 or 2mm more in dia than the design value resulting in less torque. Root cause .. Material incoming QC failure. Interesting, which one was that. The first PSLV(D-1, Sept 1993) failed, narrowly, becau...

juvva

Haridas wrote:
prasannasimha wrote:Gyroscopes could have had a Gimbal lock

You mean IMU gimble lock? As the gyros sensors are solidstate. But for that exact reason one always has one more axis ; ie 4 axis.

What is the 4th axis? ( I thought, Einstein was the only guy, who believed in the 4th axis ).

juvva

One another possible scenario ( as we wait for ISRO to tell us what really happened - if they ever will): - as Vikram transitioned from coarse to fine breaking phase, two of the four engines were shut down, by the control system. But one of the engines refused to die, or produced residual thrust fli...

juvva

BTW, one ISROwallah claims to have seen "at least 2 legs" sticking out of the V-Kram as it reposed on the Moon. Why is ISRO not releasing any such images? Any comments so far? Maybe that Pagal guy and the other one (in The Hundi) were not so far off the mark, demanding answers? Maybe this...

juvva

NASA’s LRO Fails To Spot Chandrayaan-2 Lander As scheduled, NASA’s Lunar Reconnaissance Orbiter Camera (LROC) on Sept. 17 imaged the intended lunar south pole landing site for India’s Chandrayaan-2 Vikram lander, but long shadows in the area may be obscuring the silent lunar explorer. It was near d...

juvva

Gautam_2 wrote:Thermal Imaging camera is not present on CY2. Media did not verify claims and just ran with it.

Yes. Unless they repurposed the "Imaging IR spectrometer" .......

juvva

one other possibility is a problem with throttle control of one or more engines ( h/w or s/w), remember that ISRO is trying out throttle-able engines for the first time.

juvva

Another reminder.... space is hard.

juvva

Looked like the lander was descending vertically for quiet some time before it deviated sharply from the nominal trajectory.... looking bad.. looking like a tumble.

juvva

Ohh dd show the trajectory chart pleeeeeease

juvva

^dawn @ landing site

juvva

"meet vikram" - nice video on YT:

https://www.youtube.com/watch?time_cont ... cAScK5lddw

juvva

I remember reading somewhere ( need to dig up the source), that the landing strategy is now changed. The engine in the center will be on and firing all the way to touch down(no free fall). ISRO animations on youtube show the central engine, thrusting all the way down to the surface, upto touch down...

juvva

I remember reading somewhere ( need to dig up the source), that the landing strategy is now changed. The engine in the center will be on and firing all the way to touch down(no free fall).

juvva

suryag wrote:Dhoti shiver started for me

It is dilbu time now........we need him badly, to calm our nerves.

juvva

Chandrayaan 2's Planned Landing Most Complex In ISRO History: Ex-Chairman

https://www.ndtv.com/india-news/chandra ... an-2095061

juvva

35 km x 101 km -achieved
36 km x110 km -planned

juvva

rsingh wrote:I think ladder of lander touches the surface at very steep angle. Rover could simply fall off the ladder. JMT
BTW why there is so much time gap between landing and releasing of rover? Is there any Sat com issue?

Maybe they are waiting for the lunar dust (raised during landing) to settle down.

juvva

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. We want one full...

juvva

^
119 km x 127 km -achieved
vs
114 km x 128 km -planned

juvva

https://www.isro.gov.in/chandrayaan2-latest-updates September 01, 2019 Fifth Lunar Orbit Maneuver The final and fifth Lunar bound orbit maneuver for Chandrayaan-2 spacecraft was performed successfully today (September 01, 2019) beginning at 1821 hrs IST as planned, using the onboard propulsion syste...

juvva

179km x 1412km -achieved
Vs
178km x 1411km -planned

right on the mark !!!

juvva

August 28, 2019 Third Lunar Orbit Maneuver Third Lunar bound orbit maneuver for Chandrayaan-2 spacecraft was performed successfully today (August 28, 2019) beginning at 0904 hrs IST, using the onboard propulsion system. The duration of the maneuver was 1190 seconds. The orbit achieved is 179 km x 1...

juvva

@Rony ---------- ---------- ---------- Depending on the battery condition before solar recharge you could land on surface a few days prior to dawn and stay in sleep mode until the Sunlight. ( Sorry, no birds chirping before sunrise) Landing in the dark before dawn, would be a huge challenge.......

juvva

^
118km x 4412 km : achieved
vs
121km x 4303 km : planned

juvva

Inching closer to the lunar surface: https://www.isro.gov.in/chandrayaan2-latest-updates August 21, 2019 Second Lunar bound orbit maneuver for Chandrayaan-2 spacecraft was performed successfully today (August 21, 2019) beginning at 1250 hrs IST as planned, using the onboard propulsion system. The du...

juvva

The news conference is too good.....good for aam admi. A good explanation about the reason for including the central engine - to mitigate the updraft of lunar dust, by switching of the peripheral engines, during the last few seconds of landing. This was new to me, a nice informative press meet.

juvva

114 km x 18072 km -achieved
vs
118 km x 18078 km -planned

WOW !!!!!

juvva

114 km x 18072 km -achieved
vs
118 km x 18078 km -planned

WOW !!!!!

juvva

LOI done:

https://www.isro.gov.in/update/20-aug-2 ... -insertion

juvva

Just to clear up for lay people like myself :) - there is no perigee and apogee with Chandrayaan-2 at this time, right? It is headed straight for the moon. Then there is the 'lunar capture', which leads to a new set of perigees and apogees around the moon, until it sets in at a more or less 100km o...

juvva

gashish wrote:Chandrayaan-2 Successfully enters Lunar Transfer Trajectory

https://www.isro.gov.in/update/14-aug-2019/chandrayaan-2-successfully-enters-lunar-transfer-trajectory

Not much info on burn time, Delta v, orbital parameters....

juvva

‘British occupied Ireland?’ RT has an article on Beeb. The BBC is facing accusations of “hypocrisy” for describing Kashmir as “Indian occupied,” with people asking why it doesn’t apply similar descriptions to Northern Ireland. The query was first put to the British broadcaster on Sunday by British-...

juvva

MOI video: https://www.youtube.com/watch?v=lMmyEJiOB-8

juvva

^ just as they did for mangalyan's MOI ....

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