The Indian Space Research Organization (ISRO) has reached another milestone in space exploration by launching the Microsat-R and KalamSat satellites aboard the Polar Satellite Launch Vehicle (PSLV) C-44. This was also a notable launch in the sense that it served as a technology demonstrator for PSLV, marking it as the first time this launch was done with just two strap-on motors, known as PSLV-DL with D standing for demonstration.
Introduction to the PSLV-DL
ISRO’s PSLV-DL provides an alternative to the usual six strap-on motors (side rocket boosters) on PSLV. This new setup allows it to carry a slightly higher payload than its Core-Alone version, which operates without any strap-on motors.
About the Mission: The Significance of Microsat-R
Microsat-R is a military imaging satellite weighing 130 kilograms. It was developed by the Defence Research and Development Organization(DRDO) and launched into low orbit, a first for an Indian satellite handled by ISRO. To put this achievement into perspective, the satellite sits at an altitude of 274 km.
Kalamsat: The World’s Smallest and Lightest Communication Satellite
In the same mission, ISRO launched Kalamsat, a student satellite made by Space Kidz India, and it weighs just 1.26kg. Kalamsat holds the distinction of being the world’s smallest and lightest communication satellite. Space Kidz India, the organization behind this marvel, is dedicated to creating innovative concepts for students in the field of education.
The Usability of Fourth Stage (PS4)
ISRO saw this mission as a perfect opportunity to demonstrate the usability of the fourth stage of the rocket after ejecting the satellites into orbit. The fourth and final stage of the rocket usually turns into debris after launching a satellite. However, with this new approach, it can now be used by any space agency wanting to conduct experiments in space until it disintegrates naturally.
| Polar Satellite Launch Vehicle (PSLV) C-44 | Microsat-R | KalamSat |
|---|---|---|
| First launch with only two strap-on motors | Military imaging satellite, weighing 130 kg | World’s smallest and lightest communication satellite, weighing 1.26kg |
| Can carry higher payload than Core-Alone version | Placed in a low orbit at an altitude of 274 km | Made by Space Kidz India, an education-focused organization |
Utilizing Fourth Stage for Experiments
The fourth stage of the rocket will orbit in space for about six months to a year, offering agencies a timeframe to run short-term experiments. For instance, Kalamsat will be the first to use the fourth stage as an orbital platform. The experiment with Kalamsat will begin about 1.5 hours from take-off and will last approximately 14 hours. ISRO is working towards improving the experiment duration with PS4 in the future.