A five-minute delay to pre-empt an encounter withdebrisdid not dampen the spirit at Sriharikota on Monday as the satellite launch vehicle PSLV-C20 took to the skies to catapult seven satellites into orbit,including Indo-Frenchsatellite SARAL.
While initially the control room at Sriharikota was bristling with activity, a deadsilence prevailed as launch time drew close. While initially the launch time was slated for 5.56pm, the PSLV, dubbed workhorse of the Indian Space Research Organisation, took off at 6.01pm after Isro officials got wind of some debris, close to three hours before the scheduled lift-off time.
Five minutes is a significant amountof timeduring a launch since any object in space at above 500km moves at 8km per second. The delay ensured that the rocket reached the altitude after thedebrishad moved away.
Besides the Indo-French satellite with ARgos and ALtika (SARAL), India's Polar Satellite Launch Vehicle (PSLV-C20), on its 23rd flight, also launched six commercial payloads from Austria, Britain, Canada and Denmark into a 785km polar sun synchronous orbit.
With seven satellites in total, this is the second highest number of satellites to be flown on a PSLV. In April 2008, it put in orbit 10 satellites, including the national Cartosat-2A, on the PSLV-C9 rocket.
The 668.5kg 44.4-metre tall rocket, with a lift-off mass of 229.7 tonnes, has been configured in a 'core-alone' format without solid strap-on motors. According to officials this is the ninthcore-aloneflightof a PSLV.
The PSLV put the 407-kg Indo-French satellite with ARgos and ALtika (SARAL) into orbit in 1077-72 seconds. SARAL will help study ocean surface and the environment using the two devices — ARgos and the ALtika. The French ALtika altimeter works on the principle of RADAR,emitting microwave pulse and picking up signals that bounce back. The time taken for the signal to return provides the distance between satellite and the sea. "This way we'll be able to measure the height of the waves and assess changes in the ocean,"said an Isro official.
Of the six smaller satellites, two each are from Canada and Austria and one each from the U K and Denmark. This includes NEOSSAT from Canada which will detect and track either near-earth asteroids or satellites in geostationary orbit.
President Pranab Mukherjee, who witnessed the launch, hailed Isro for its track record and wished the team success in its future ventures.
Isro does it again, 7 SATS in orbit
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Isro does it again, 7 SATS in orbit
