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by juvva
13 Dec 2019 16:15
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4149
Views: 906823

Re: Indian Space Program: News & Discussion - Sept 2016

Gerard wrote:

WOW, this is way better than DD broadcast.
by juvva
11 Dec 2019 16:51
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4149
Views: 906823

Re: Indian Space Program: News & Discussion - Sept 2016

Prasad wrote:Sat put into orbit.


+ all customer sats released.!
by juvva
11 Dec 2019 14:30
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4149
Views: 906823

Re: Indian Space Program: News & Discussion - Sept 2016

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...
by juvva
27 Nov 2019 10:14
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4149
Views: 906823

Re: Indian Space Program: News & Discussion - Sept 2016

all nano sats seperated.... mission completed!!!
by juvva
03 Oct 2019 10:41
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4149
Views: 906823

Re: Indian Space Program: News & Discussion - Sept 2016

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...
by juvva
28 Sep 2019 06:57
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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 ).
by juvva
26 Sep 2019 15:54
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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...
by juvva
22 Sep 2019 07:15
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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...
by juvva
18 Sep 2019 13:02
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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...
by juvva
09 Sep 2019 10:31
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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" .......
by juvva
07 Sep 2019 10:03
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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.
by juvva
07 Sep 2019 02:57
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

Another reminder.... space is hard.
by juvva
07 Sep 2019 02:44
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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.
by juvva
07 Sep 2019 01:58
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

Ohh dd show the trajectory chart pleeeeeease
by juvva
07 Sep 2019 01:43
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

^dawn @ landing site
by juvva
05 Sep 2019 23:09
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

by juvva
05 Sep 2019 09:08
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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...
by juvva
05 Sep 2019 08:05
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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).
by juvva
04 Sep 2019 15:19
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

suryag wrote:Dhoti shiver started for me


It is dilbu time now........we need him badly, to calm our nerves.
by juvva
04 Sep 2019 09:20
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission


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


https://www.ndtv.com/india-news/chandra ... an-2095061
by juvva
04 Sep 2019 07:26
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

35 km x 101 km -achieved
36 km x110 km -planned
by juvva
03 Sep 2019 23:50
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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.
by juvva
01 Sep 2019 19:26
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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...
by juvva
01 Sep 2019 19:19
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

^
119 km x 127 km -achieved
vs
114 km x 128 km -planned
by juvva
01 Sep 2019 19:13
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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...
by juvva
28 Aug 2019 10:17
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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

right on the mark !!!
by juvva
28 Aug 2019 10:01
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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...
by juvva
23 Aug 2019 19:59
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

@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.......
by juvva
21 Aug 2019 14:26
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

^
118km x 4412 km : achieved
vs
121km x 4303 km : planned
by juvva
21 Aug 2019 14:15
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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...
by juvva
20 Aug 2019 12:47
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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.
by juvva
20 Aug 2019 11:07
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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

WOW !!!!!
by juvva
20 Aug 2019 10:51
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4149
Views: 906823

Re: Indian Space Program: News & Discussion - Sept 2016

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

WOW !!!!!
by juvva
18 Aug 2019 08:38
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 4149
Views: 906823

Re: Indian Space Program: News & Discussion - Sept 2016

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...
by juvva
14 Aug 2019 15:47
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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....
by juvva
12 Aug 2019 12:18
Forum: Strategic Issues & International Relations Forum
Topic: J&K Union Territory-2019
Replies: 3284
Views: 488862

Re: J&K Union Territory-2019

‘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-...
by juvva
11 Aug 2019 17:38
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2219
Views: 277716

Re: Chandrayan-2 Mission

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

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