On 100th space mission, ISRO puts two satellites in orbit

India on Sunday successfully launched its 100th space mission with the indigenous PSLV-C21 rocket putting in orbit two foreign satellites.

In a copybook launch, witnessed by Prime Minister Manmohan Singh, ISRO's workhorse PSLV placed in orbit France's SPOT 6 satellite and Japanese spacecraft PROITERES, some 18 minutes after a perfect lift off from the Satish Dhawan Space Centre in Sriharikota.

The launch, scheduled for 9.51 am, was delayed by two minutes at the end of the 51-hour countdown.

The Polar Satellite Launch Vehicle, on its 22nd flight, soared into an overcast sky at 9.53 am carrying the 720 kg French satellite, the heaviest satellite to be launched by India for a foreign client.

The mission was described as "a spectacular success" and a milestone by Dr Singh, who keenly watched the entire launch sequence and applauded each stage separation culminating in the placing of the two satellites in orbit.

The launch was a landmark for Indian Space Research Organistion which began its space odyssey on a humble note when it launched the indigenous Aryabhatta on board a Russian rocket on April 19, 1975.  

Sunday's launch has yet again demonstrated the versatility and robustness of PSLV, with the rocket completing its 21st successful mission in a row since its first failed flight in September 1993.

No Indian satellite was onboard Sunday's flight which is the third wholly commercial launch undertaken by ISRO for foreign clients.

SPOT-6 is the biggest commercial lift so far since India forayed into the money-spinning commercial satellite launch services after 350 kg Agile of Italy put in orbit in 2007 by PSLV. Twelve other foreign commercial satellites launched by ISRO weighed below 300 kg.

Significantly, France's five earlier SPOT satellites were launched by European Araine rocket.

SPOT-6, built by ASTRIUM SAS, a subsidiary of EADS, France, is an earth observation satellite, while the micro satellite PROITERES, developed by students and faculty of Osaka Institute of Technology, will study Kansai region of Japanese island of Honshu.

ISRO sources said that with Sunday's mission, the agency has launched 62 satellites, one space recovery module and 37 rockets, making it a grand 100.

Each Indian rocket going up is considered a mission, as also each satellite being placed in orbit.

The sources said the two-minute delay in Sunday's launch was to avoid collision with space debris during the flight.

According to American space agency NASA, more than 500,000 pieces of debris, or "space junk," are tracked as they orbit Earth.

The debris travel at speeds up to 17,500 mph, fast enough for a relatively small piece of orbital debris to damage a satellite or a spacecraft, which are monitored and based on which evasive action is taken.