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  • Namana Nagaraj

Navigating the Halo Orbit for Solar Insights

In a celestial ballet that spans 15 lakh kilometers, India's Aditya-L1 spacecraft is on the brink of a monumental moment – the intricate insertion into the halo orbit around Lagrange Point 1 (L1), a gravitational haven nestled between the Earth and the Sun.


Launched by ISRO on September 2, 2023, from Sriharikota, Aditya-L1 is poised to reach its destination on January 6, 2024. This final leg of the journey is laden with complexity, as the spacecraft undertakes a critical insertion into L1, demanding meticulous navigation and control.

The journey leading up to this moment has involved four Earth-bound orbital maneuvers, propelling Aditya-L1 into a transfer orbit directed towards L1. The success of this insertion is paramount, as L1 provides an unobstructed view of the Sun, enabling Aditya-L1 to delve into the intricacies of the solar atmosphere, magnetic storms, and their repercussions on Earth.


The significance of L1 extends beyond national borders, with Aditya-L1 set to capture vital data on solar events such as Coronal Mass Ejections (CMEs) and interplanetary magnetic fields. This treasure trove of information promises to enrich not only India's scientific endeavors but also contributes to the global scientific community.

However, the road to success is riddled with challenges. The spacecraft's position and velocity must be vigilantly monitored and adjusted using onboard thrusters to ensure adherence to the planned trajectory. The instruments aboard, notably the Visible Emission Line Coronagraph (VELC) and the Solar Ultraviolet Imaging Telescope (SUIT), must be shielded from the Sun's intense radiation and particles.


The complexities escalate with the unstable nature of L1, requiring stationkeeping maneuvers to maintain Aditya-L1's halo orbit. These maneuvers, with adjustments ranging from 0.2–4 m/s per year, counteract gravitational influences from other celestial bodies and the pressure exerted by solar radiation.


As Aditya-L1 approaches its destination, ISRO's mission team stands vigilant, ready to navigate the intricacies of space travel. The success of this insertion not only showcases ISRO's capabilities but also opens a gateway to unraveling the mysteries of our Sun and its impact on space weather.

In this cosmic performance, Aditya-L1 emerges not only as a symbol of technological prowess but as a beacon of new insights, poised to illuminate the profound interplay between our Sun and the vast expanse of space. Click here to get instant aerospace and Defence Updates! 

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