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What Is The Lagrange Point, From Which ISRO’s Aditya-L1 Will Observe The Sun?

The Aditya-L1 spacecraft is made to offer close-up and distant observations of the solar corona and solar wind, respectively, at Lagrange point 1.
Aditya L-1, India’s first space-based mission to study the Sun, has arrived in Sriharikota and is prepared for launch in the first week of September, according to ISRO Chairman S Somanath on Saturday. In two days, Somanath promised, the precise launch date would be revealed. The spacecraft will be positioned in a halo orbit 1.5 million kilometres from Earth, at the Lagrange point 1 (L1) of the Sun-Earth system. Aditya-L1 could view the Sun continually without any occultation or eclipses by being placed in the halo orbit around the Lagrange point 1.

Seven payloads would be carried by the Aditya-L1 mission, which was designed to investigate the Sun from an orbit around the L1 and observe its photosphere, chromosphere, and outermost layers, the corona, in various wavebands.

Lagrange point 1: What is it?

Lagrange Point 1, also known as L1, is one of the five Lagrange points in the Earth-Sun system where a smaller object can effectively “hover” in a stable position in relation to the two larger bodies. At this point, the gravitational forces of the two larger bodies balance each other out.

Lagrange Point 1 (L1), which is situated between the Earth and the Sun in the Earth-Sun system, is situated roughly 1.5 million kilometres (or 930,000 miles) from Earth in the Sun’s direction. This location lies within the Earth’s orbital path around the Sun and is on the line that connects the two bodies.

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Any item placed at L1 will remain very stable with respect to the Earth-Sun system, making it a particularly fascinating point. It is a prime position for numerous scientific studies and space missions due to the stability that results from the interaction of gravitational forces at this point. In order to have a continuous view of the Sun or the universe without being influenced by Earth’s atmosphere or the day-night cycle, the Solar and Heliospheric Observatory (SOHO) has been placed close to L1.

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Four payloads use the unique vantage point L1 to observe the Sun directly, while the remaining three payloads use the L1 to conduct in-situ particle and field studies. This allows for significant scientific research on the propagation of solar dynamics in the interplanetary medium.

Srushti Sharma

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