Indian Space Programme Discussion

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Re: Indian Space Programme Discussion

Postby SSridhar » 04 Apr 2014 07:16

ISRO gears up to launch second navigation satellite = TSS, The Hindu
The Indian Space Research Organisation (ISRO) is looking forward to the liftoff of its Polar Satellite Launch Vehicle PSLV-C24 from Sriharikota at 5.14 p.m. today.

After more than 19 minutes of flight, if the PSLV-C24 puts India’s navigation satellite, called the Indian Regional Navigation Satellite System (IRNSS-1B), into a perfect orbit, applause will echo across the Mission Control Centre. More so, because it will be the 25th consecutive successful launch of a PSLV, the ISRO’s trusty workhorse.

This launch vehicle is the PSLV’s XL version, armed with more powerful strap-on booster motors than in the standard PSLV, which will put the 1,432-kg IRNSS-1B into its orbit.

The IRNSS-1B is India’s second dedicated navigation satellite. The first, IRNSS-1A, was put into orbit on July 1 last year. All the seven satellites, which form the IRNSS, will be in orbit by 2016.

“The countdown is proceeding as per the timeline, without any issues,” said M.Y.S. Prasad, Director, Satish Dhawan Space Centre, Sriharikota, on Thursday.

The countdown, which will last 58 hours and a half, began at 6.44 a.m. on April 2. By Thursday afternoon, the PSLV-C24’s fourth stage was accurately filled with liquid propellants and the lower stage control systems with solid propellants.

“From 11 p.m. on Thursday till the early morning of Friday, we will fill the rocket’s second stage with more than 41 tonnes of liquid propellants. Then, other operations such as filling the launch vehicle with pressurised gas will be done,” said Dr. Prasad. During the countdown’s final phase, the rocket’s electronic systems will be tested.

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Re: Indian Space Programme Discussion

Postby member_28108 » 04 Apr 2014 07:17

Apr 04, 2014
Mobile Service Tower (MST) withdrawal to parking end completed
Propellant filling operation of Second Stage (PS2) completed

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Re: Indian Space Programme Discussion

Postby kvraghavaiah » 04 Apr 2014 13:05

2 hours to lift off.
Last edited by kvraghavaiah on 04 Apr 2014 14:47, edited 1 time in total.

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Re: Indian Space Programme Discussion

Postby SSridhar » 04 Apr 2014 14:29

X-posting from a defunct thread

My take on India's and #isro plans of launching Indian astronauts in to space

http://www.thespacereview.com/article/2481/1


Gurbir

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Re: Indian Space Programme Discussion

Postby Austin » 04 Apr 2014 15:33

Webcast of Launch from 16:45 onwards

http://webcast.isro.gov.in/

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Re: Indian Space Programme Discussion

Postby kvraghavaiah » 04 Apr 2014 15:36

60 minutes to lift off.

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Re: Indian Space Programme Discussion

Postby pankajs » 04 Apr 2014 15:50

Times of India ‏@timesofindia 3m

PSLV C-24 successfully launches India's second navigation satellite IRNSS 1B.

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Re: Indian Space Programme Discussion

Postby SSridhar » 04 Apr 2014 16:13

Only ToI can give such a news based on premonition. Launch is live on DD National. About 30 minutes left for launch.

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Re: Indian Space Programme Discussion

Postby pankajs » 04 Apr 2014 16:23

It seems it all started with PTI and was picked up by quite a number of news outlet twitter feed
------------------------------->>
Press Trust of India ‏@PTI_News 42m

PSLV C-24 successfully launches India's second navigation satellite IRNSS 1B.

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Re: Indian Space Programme Discussion

Postby RKumar » 04 Apr 2014 16:42

2nd stage separated

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Re: Indian Space Programme Discussion

Postby member_23694 » 04 Apr 2014 16:44

as usual very poor live telecast.... :evil: but PSLV as usual going strong :D

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Re: Indian Space Programme Discussion

Postby RKumar » 04 Apr 2014 16:49

3rd stage separated at 610 and 4th ignited at 615. Everything normal

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Re: Indian Space Programme Discussion

Postby Comer » 04 Apr 2014 16:51

Noob question:Why is 3rd stage jettisoned long after burnout?

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Re: Indian Space Programme Discussion

Postby Vashishtha » 04 Apr 2014 16:55

There is a bit of residual thrust the 3rd stage keeps imparting onto the vehicle even after 'burn-out' ...

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Re: Indian Space Programme Discussion

Postby RKumar » 04 Apr 2014 16:56

they called it cruise speed ... there is no additional energy required to carry this weight but it is providing the momentum. Once it starts slowing down then it is separated.

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Re: Indian Space Programme Discussion

Postby RKumar » 04 Apr 2014 16:58

load separated ...

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Re: Indian Space Programme Discussion

Postby SSridhar » 04 Apr 2014 16:58

Very precise orbit achieved

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Re: Indian Space Programme Discussion

Postby shiv » 04 Apr 2014 16:58

IRS 1B separated and in orbit. Well done

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Re: Indian Space Programme Discussion

Postby member_23694 » 04 Apr 2014 17:03

shiv wrote:IRS 1B separated and in orbit. Well done


Sir IRS 1B definitely separated and placed in orbit but in 1991 :wink:

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Re: Indian Space Programme Discussion

Postby symontk » 04 Apr 2014 17:06

That too with a Russian Molniya, we have come a long way after that

Congrats ISRO

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Re: Indian Space Programme Discussion

Postby symontk » 04 Apr 2014 17:08

Vashishtha wrote:There is a bit of residual thrust the 3rd stage keeps imparting onto the vehicle even after 'burn-out' ...


Apart from that, since 4th stage is not fired, separating 3rd stage during coasting phase is dangerous and so it is separated close to 4th stage ignition so that any attitude changes can be immediately corrected

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Re: Indian Space Programme Discussion

Postby SSridhar » 04 Apr 2014 17:09

Dr. Radhakrishnan says, perigee is 283 (planned 284) and apogee 20630 (planned 20650) and inclination differed only in the second decimal.

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Re: Indian Space Programme Discussion

Postby srin » 04 Apr 2014 17:09

Great stuff, ISRO.

I wish there was a way to turn off the commentary and just listen to the ISRO launch center announcements.

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Re: Indian Space Programme Discussion

Postby akashganga » 04 Apr 2014 17:18

Congratulations ISRO for yet another successful launch.

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Re: Indian Space Programme Discussion

Postby nits » 04 Apr 2014 17:25

barath_s wrote:Re: Insat :
NRao/Cybaru :

If it had that amount of delta vee onboard, it's life would not be over. The amount of delta vee required to send a satellite wandering off into space (presumably interstellar) or into the sun is quite substantial (and may not be available even when new).

It will be cheaper to de-orbit it. However, this one has been parked in a higher orbit. (cheaper still in terms of delta vee)


They can still use it for Anti Satelite Weapon Demo :wink:

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Re: Indian Space Programme Discussion

Postby Austin » 04 Apr 2014 17:29

Congratulations ISRO for repeated splendid performance !

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Re: Indian Space Programme Discussion

Postby sudhan » 04 Apr 2014 17:48

A PSLV success has become as common as a sneeze.. Textbook launch, paarfaamance naarmal.. nothin exciting.. move on folks..

the GSLV MKII launch.. that would keep me on the edge..

Congrats to ISRO for making the PSLV this good! :)

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Re: Indian Space Programme Discussion

Postby member_28108 » 04 Apr 2014 17:54

Congrats. Unfortunately missed the live telecast by a whisker ! :(

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Re: Indian Space Programme Discussion

Postby vasu raya » 04 Apr 2014 18:03

sudhan wrote:A PSLV success has become as common as a sneeze.. Textbook launch, paarfaamance naarmal.. nothin exciting.. move on folks..


:lol: good going ISRO!

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Re: Indian Space Programme Discussion

Postby abhijitm » 04 Apr 2014 18:46

Congratulations ISRO!

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Re: Indian Space Programme Discussion

Postby Sonugn » 04 Apr 2014 21:13

ISRO ka launch shandaar
Abki ....................

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Re: Indian Space Programme Discussion

Postby Supratik » 04 Apr 2014 22:18

congrats

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Re: Indian Space Programme Discussion

Postby Suraj » 05 Apr 2014 00:19

You know PSLV launches are routine when the launch gets less than a page of posts and no special thread of it's own. Soon even the countdown posts will be gone.

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Re: Indian Space Programme Discussion

Postby member_23962 » 05 Apr 2014 02:31

Suraj wrote:You know PSLV launches are routine when the launch gets less than a page of posts and no special thread of it's own. Soon even the countdown posts will be gone.


GSLV launches should also become a routine similar to PSLV in next couple of years.

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Re: Indian Space Programme Discussion

Postby member_23370 » 05 Apr 2014 02:32

Pretty soon it will be same for GSLV-MK2 and 3, and then ULV.

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Re: Indian Space Programme Discussion

Postby Varoon Shekhar » 05 Apr 2014 06:13

srin wrote:Great stuff, ISRO.

I wish there was a way to turn off the commentary and just listen to the ISRO launch center announcements.


The bilingual commentary is nice, and the DD guy( or ISRO guy) doing the English one, does a fine job. Remember,it's mostly for lay people.

For IRNSS-1B: is there any change in weight/mass, any further indigenisation of parts or components?

And a real layman's question: Do all the 7 IRNNS's have to be in orbit, for the GPS to be working? Can something be done with 2, 3,4 of the satellites up in orbit?

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Re: Indian Space Programme Discussion

Postby member_28108 » 05 Apr 2014 06:50

$ are required as a minimum to triangulate +give altitude. (we need 3 points to triangulate and a 4th measurement for altitude) to get coordinates. the remaining 3 are redundant or for wider coverage and or increased accuracy. I presume they will have these for the sake of possible ASAT attacks as well though since they are in GSO/GEO attack may be difficultcompared to a lower orbit GPS system.

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Re: Indian Space Programme Discussion

Postby Yogi_G » 05 Apr 2014 07:33

Isnt this the 25th straight successful launch of PSLV? Thats one reliable workhorse.

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Re: Indian Space Programme Discussion

Postby member_28108 » 05 Apr 2014 07:50

Is the GSLV Mark 3 launch scheduled in June ?
Also when is hte next GSLV Mark2 launch ?

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Re: Indian Space Programme Discussion

Postby pankajs » 05 Apr 2014 08:31

GSLV to soar into sky with crew capsule in June
http://www.thehindu.com/sci-tech/scienc ... epage=true
India’s huge Geo-synchronous Satellite Launch Vehicle (GSLV- Mark III) will soar into the sky with a crew capsule from Sriharikota in June, signalling that the country is getting ready to send its own astronauts into space. It will be an experimental mission and it will carry no astronauts. This crew capsule will return to the earth with parachutes.

It would be identical to the “final crew capsule in structural and thermo-structural parts,” said S. Ramakrishnan, Director, Vikram Sarabhai Space Centre, Thiruvananthapuram. “We will take it beyond the atmosphere, make it re-enter the earth’s atmosphere, decelerate it and make a soft touchdown in the Bay of Bengal off the Andaman coast. We will make efforts to recover it.”

...
Mr. Ramakrishnan said the Indian Space Research Organisation would evaluate the structural and thermal protection systems to withstand the re-entry load, and thermo-dynamic heating.

This crew capsule will not contain the life-support systems which will be required when actual astronauts fly in the crew capsule. “We will be measuring the environment inside the capsule which will give inputs on the validation of the astronauts’ life-support systems in terms of temperature, vibration and shock which will be experienced inside the crew capsule. This will help us in designing the life-support systems when we actually fly the astronauts into space.”

...
The GSLV-MkIII was getting assembled at Sriharikota, Dr. Radhakrishnan said. Its two strap-on motors had arrived at the spaceport. . The cryogenic stage is getting ready in the ISRO Propulsion Complex at Mahendragiri, Tamil Nadu.

Dr. Radhakrishnan said the PSLV would put into orbit in June the French SPOT-7 satellite and four other satellites from abroad.


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