Of the 104 satellites to be launched on February 15, only three are Indian.
"We want to make optimum use of our capacity. We are launching our three satellites. One is of 730 kgs while other two are 19 kgs each. We had additional space of 600 kgs. So we decided to accommodate 101 satellites," ISRO chairman A S Kiran Kumar said.
"Roughly half of our cost will be covered by the foreign satellites we are launching," he said, without revealing the exact amount ISRO will earn from foreign customers.
ISRO will launch a record 104 satellites through its workhorse rocket PSLV-C37 on February 15 from the Satish Dhawan Space Centre in Sriharikota in Andhra Pradesh.
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The Indian satellites are from the Castrosat series.
Last year, ISRO launched record 20 satellites at one go. The highest number of satellites launched in a single mission is 37, a record that Russia set in 2014. The US space agency NASA launched 29.
"It is an indigenous development and tests are on. It's a control descend. So it has engines that allow a control descend," Kumar said.
Chandryaan 2 mission seeks to make a landing on the moon.
The ISRO said that all SAARC countries, except Pakistan, have given their consent for the South Asian satellites project envisioned by Prime Minister Narendra Modi as "India's gift to its neighbours".
Kumar said that the manned mission project is "not a top priority" for the ISRO, as he emphasised on enhancing space infrastructure.
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