"Aryabhata was India's first satellite, named after the great Indian astronomer of the same name. It was launched by the Soviet Union on 19 April 1975 from Kapustin Yar using a Cosmos-3M launch vehicle. Aryabhata was built by the Indian Space Research Organization (ISRO) to conduct experiments related to astronomy. The satellite reentered the Earth's atmosphere on 11 February 1992."
From Wikipedia, the free, online encyclopedia at:
http://en.wikipedia.org/wiki/Aryabhata_%28satellite%29
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2006-12-09 23:17:57
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answer #1
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answered by cfpops 5
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India’s rocket development history did not actually begin at SHAR, but at the Thumba Equatorial Rocket Launching Station near Thiruvananthapuram. Small rockets known as sounding rockets, which are used for a variety of mostly experimental purposes, are flown from Thumba, and the first indigenous sounding rocket was Rohini. Rohini RH-75’s diameter measured a mere 7.5 centimetres.
The first actual satellite launch vehicle, the eponymously named SLV-3, did take off from SHAR, in 1979. Its second stage failed however – a jammed valve led to oxidiser leak. The second attempt, a year later, succeeded. It placed a satellite, also called Rohini, the RS-1, in orbit. Two more launches of the 22 metre long vehicle followed, with more Rohinis settling into orbit. And India’s space programme was on its way.
Only to stumble again with an augmented version — the ASLV. The first two developmental flights, in 1987 and 1988, both failed. Finally, ASLV-D3 was launched in 1992, with the SROSS-C satellite.
ISRO’s scientists were now ready for the first PSLV, the Polar Sun-synchronous Launch Vehicle. The project had been initiated in 1982, and more than 10 years later, in September 1993, PSLV D1 took off from SHAR. On board was the IRS-1E satellite. Most systems were performing normally, and things looked good. But two small rockets known as retro rockets failed, resulting in a fatal contact between the second and third stages, when the second stage was separating in flight. There was also a software error in the ‘pitch control loop’ of the on-board guidance and control processor. Pitch movement is the up and down movement of the vehicle in air, which has to be controlled to keep the vehicle in intended trajectory, along with sideway movements known as yaw. PSLV D1 had failed.
Then things turned. The successful flight of ASLV-D4 in 1994, quickly followed up the same year with PSLV D2, was to set up a superb track record of 12 successful flights over the next decade and a half, broken only with the GSLV F02. In that intervening period, ISRO went from just another struggling scientific establishment, to one of the more admired organisations in the world.
It was doing well with both satellites and launchers. The world lauded its "success on a shoe-string budget." New Delhi was happy to put money in ISRO – something always came of it. Sanctions regimes like the Missile Technology Control Regime (MTCR) were slapped on it. It became very difficult for ISRO to procure what it needed. It had to make its own
2006-12-09 23:18:48
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answer #2
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answered by Krishna 6
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