ISRO achievement

The Indian space programme launched ten satellites in 2016, three times more than the preceding year and the most ever, according to Indian Space Research Organisation (ISRO) data.

The September 26 launch of the Polar Satellite Launch Vehicle (PSLV)-C35 set two records: it was the longest satellite-launch mission yet, two hours, havingcompleted its previous mission in just under 30 minutes on June 22 (another benchmark occasion with the launching of 20 satellites in one go); and the rocket released eight satellites – five foreign and three Indian – into two orbits, something the ISRO has not done before.

No more than 38% of satellites launched over the last ten years have been Indian. Over ten years, ISRO has had 34 launches, successfully sending up 121 satellites, 75 of them foreign: 18 (24%) were from the US, 11 (15%) Canadian, eight (11%) each from Singapore and Germany and six (8%) from the UK 

However, in terms of weight, the Indian satellites that ISRO has launched were ten times heavier, by kg, than foreign satellites carried aloft by PSLV and other launch vehicles over the last decade.

Although foreign satellites (one US, one Canadian and three Algerian) outnumbered domestic launches on Monday, according to the ISRO list of foreign satellites launched, Indian spacecraft occupied most of the 1,750-kg capacity of the PSLV, which completed its 36th successive, successful launch.

Up to 16% of the PSLV’s capacity was occupied by small satellites from foreign nations, who bought space on the Indian launcher. Deals are arranged by Antrix, the commercial arm of the department of space, and these are becoming more profitable by the year.

India earned 205% more revenue in the financial year 2014-15 (Rs 415.4 crore) than the previous year (Rs 136 crore) and 704% more than in 2013 (Rs 51.3 crore) for satellite-launch services.

On the most recent launch on Monday, the combined weight of the five foreign craft was 279 kg, the heaviest being the ALSAT-2B (117 kg), which is an Earth observation satellite meant to help Algeria with management of natural disasters and land planning, among other things.

The combined weight of the three Indian craft was 386 kg. The IndianSCATSCAT-1 alone weighs 371 kg. The SCATSCAT-1 is a government-owned craft intended to observe Earth, aiding weather forecasts among other things. It will operate for five years.

The other two weighed only 15 kg combined and were from Indian universities. The PRATHAM (ten kg) is from the Indian Institute of Technology, Bombay and the PISAT (five kg) is from PES University in Bengaluru. They are both conducting scientific experiments of their own.

If a satellite is heavier, assuming it is efficiently built, it is because of multiple payloads, indicating a greater amount of equipment to measure things more accurately or to measure different things. Consider the seven IRNSS spacecraft (1A-1G), all of which featured a separate payload for navigation and ranging. Each IRNSS weighed 1,425 kg or 84% of the PSLV capacity.

The heaviest foreign satellite ever launched by ISRO was 400 kg, an Earth observation satellite from Singapore on December 16, 2015. Only 20% of Indian Earth observation crafts weighed less than that and most weigh well over 1,000 kg.

India will benefit from the scientific experience of launching a heavier craft, but it has also been suggested – by the BBC here–that foreign investors want the Indian PSLV craft to take their heavy payloads instead and that the commercial future of India’s space project could lie in that direction.

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