ISRO to launch 2 more PSLV this year, GSAT-12 reaches geosynchronous orbit

[rajusri]

The Hindu : News / National : GSAT-12 reaches its home in a circular geo-synchronous orbit

GSAT-12 reaches its home in a circular geo-synchronous orbit

T. S. Subramanian



India's communication satellite GSAT-12, put in orbit on July 15, reached its home in a circular geo-synchronous orbit at an altitude of 36,000 km on Tuesday. The Polar Satellite Launch Vehicle (PSLV-C17) of the Indian Space Research Organisation (ISRO), which lifted off from the space station at Sriharikota on July 15, 2011, put the 1,410 kg GSAT-12 in a sub geo-synchronous transfer orbit (sub-GTO) with an apogee of 21,020 km and a perigee of 284 km.

Challenging operation

After the satellite was put in a sub-GTO, the liquid apogee motor (LAM) on board was fired once each day from July 16-19 to circularise the orbit at an altitude of 36,000 km. On July 16 and 17, commands were given from the Master Control Facility (MCF) at Hassan in Karnataka to the LAM to take the satellite's apogee from 21,020 km to 36,000 km when the satellite was at its perigee. Similarly, the commands to the LAM to fire to take the perigee from 284 km to 36,000 km were given on July 18 and 19 when the satellite was at its apogee. “Thus, it was a challenging operation,” said an ISRO official.

“But all operations went off well. The sub-systems on board the satellite are functioning normally. The satellite has now made it to its final, circular geo-synchronous orbit of 36,000 km,” he added.

The LAM will be fired again on Wednesday for final trimming of the satellite's orbit.

With 12 extended C-band transponders, the satellite will be useful in tele-education, tele-medicine, disaster management support, telephone services and so on.

Two more this year

This year ISRO will launch two more satellites.

It is now getting ready for the launch of Megha-Tropiques satellite, an Indo-French joint venture, from the spaceport at Sriharikota by the end of September.

The PSLV-C18 will put the 1,000-kg Megha-Tropiques (Megha in Sanskrit means cloud and Tropiques in French means tropics), being built by the ISRO Satellite Centre, Bangalore, into an 867 km orbit. It will be useful in studying the weather in tropical countries.

For surveillance

ISRO is also building for surveillance, RISAT-1 (Radar Imaging Satellite) which will be put in orbit by the end of December by PSLV-C19.

It can take pictures of the earth day and night and in all weather conditions.

 

[Alugar]

RISAT-1


Spy Satellite

 

[Bhairava]

Go ISRO !!

Looking forward for the successful launch of RISAT.

 

[tvsram1992]

GSLV can lauch satellites at comparably low costs.
but 1 GSLV fail = Crash of Su30mki(costs)

 

[AMCA]

GSLV can lauch satellites at comparably low costs.
but 1 GSLV fail = Crash of Su30mki(costs)

Its insured anyways..

 

[Vibs]

GSLV can lauch satellites at comparably low costs.
but 1 GSLV fail = Crash of Su30mki(costs)

Yeah, but GSLV is to form the foundation of our future manned programs. Hope they continue with it's developments. Also looking forward to SRE-2.

 

[AMCA]

Yeah, but GSLV is to form the foundation of our future manned programs. Hope they continue with it's developments. Also looking forward to SRE-2.

Indeed, Our Human Space venture is dependent on how successful we are in GSLV missions. We have a human spaceflight coming in 2013 or 2014 but the GSLV dosent seem to be confident.

 

[rajusri]

RISAT-1


Spy Satellite

RISAT-1

Radar Imaging Satellite (RISAT) is a microwave remote sensing satellite carrying a Synthetic Aperture Radar (SAR)

The satellite weighing around 1850 kg is slated for launch by PSLV-C19(XL) during 2011 into a 536 km orbit with 25 days repetitivity with an added advantage of 12 days inner cycle for Coarse Resolution ScanSAR mode.

 

[angeldemon_007]

ISRO is on fire...

 

[punit]

going great. Top buggers 4m DRDO should be forced to work like cleaner/sweepers in ISRO in order 2 learn work ethics .

 

[Alugar]

Just like ISRO said last year that they are capable of 10 launches in a year

 

[HitesH]

we have seen so many launches that now these satellite launches dont excite me any more.........shows the superiority of the organization.....good doing isro

 

[rajusri]

going great. Top buggers 4m DRDO should be forced to work like cleaner/sweepers in ISRO in order 2 learn work ethics .

You are an idiot. Forget cleaner or sweeper , you are not even allowed to go inside in any of these that may harm their works.

ISRO works on two systems PSLV and GSLV. DRDO works on hundreds of such systems. ISRO made 22 PSLV and GSLV in last decade , DRDO made hundreds of missiles and other weapons.

ISRO has nothing to prove against anyone , DRDO do , they have to make weapons better than international standard at much lower cost.

ISRO's technologies does not need to beat Pakistan or China but DRDO's missiles do.

ISRO is its own customer and DRDO's customers are foreign maal lover politicians and armed forces which wants lots of money.

 

[tvsram1992]

Its insured anyways..

I wonder why Chandrayan I is not given insurance

 

[Laughing_soldier]

Way to go ISRO but comparing ISRO and DRDO is not logical. They work in two different domains as pointed out by rajusri.

RISAT-1

Radar Imaging Satellite (RISAT) is a microwave remote sensing satellite carrying a Synthetic Aperture Radar (SAR)

The satellite weighing around 1850 kg is slated for launch by PSLV-C19(XL) during 2011 into a 536 km orbit with 25 days repetitivity with an added advantage of 12 days inner cycle for Coarse Resolution ScanSAR mode.

mate this is Risat-2. here is Risat-1