New Delhi: India’s first space-based observatory to study the Sun, Aditya-L1, reached its orbit around the Lagrange Point-1 (L1) on Saturday. ISRO successfully performed the final manoeuvres to place the spacecraft in the halo orbit around the L1 point. Prime Minister Narendra Modi praised ISRO’s accomplishment on Twitter, saying, “India creates yet another landmark. India’s first solar observatory Aditya-L1 reaches its destination. It is a testament to the relentless dedication of our scientists in realising among the most complex and intricate space missions.” “I join the nation in applauding this extraordinary feat. We will continue to pursue new frontiers of science for the benefit of humanity,” he added.


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The L1 point of the Sun-Earth system is about 1.5 million km from the Earth. It is about one per cent of the total distance between the Earth and the Sun. A satellite in a halo orbit around the L1 point has the major advantage of continuously viewing the Sun without any occultations/ eclipses, ISRO officials said, adding, this will provide a greater advantage in observing solar activities and their effect on space weather in real time.



A Polar Satellite Launch Vehicle (PSLV-C57) launched the Aditya-L1 spacecraft from the second launch pad of Satish Dhawan Space Centre (SDSC), Sriharikota, on September 2, 2023. After a flight duration of 63 minutes and 20 seconds, it was successfully injected into an elliptical orbit of 235x19500 km around the Earth then.


The spacecraft underwent a series of maneuvers thereafter and headed Sun-Earth L1, having escaped the Earth’s sphere of influence. The spacecraft carries seven payloads to observe the photosphere, chromosphere and the outermost layers of the Sun (the corona) using electromagnetic and particle and magnetic field detectors.


“Using the special vantage point L1, four payloads directly view the Sun and the remaining three payloads carry out in-situ studies of particles and fields at the Lagrange point L1, thus providing important scientific studies of the propagatory effect of solar dynamics in the interplanetary medium,” according to the space agency.