Aditya-L1 Successfully Completes Fourth Earth-Bound Maneuver: ISRO

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India’s Aditya-L1 spacecraft, the country’s pioneering mission to explore the Sun, recently achieved a significant milestone by successfully executing its fourth earth-bound maneuver, as announced by the Indian Space Research Organisation (ISRO). This remarkable achievement marks a significant step forward in the mission’s journey toward its destination around the first Sun-Earth Lagrangian point (L1), situated approximately 1.5 million kilometers from Earth.

ISRO took to the platform formerly known as Twitter, now X, to share the news of Aditya-L1’s latest accomplishment. The fourth Earth-bound maneuver, referred to as EBN#4, was conducted flawlessly, with tracking support from ISRO’s ground stations in Mauritius, Bengaluru, SDSC-SHAR, and Port Blair. Additionally, a transportable terminal stationed in the Fiji islands for Aditya-L1 provided crucial support during the post-burn operations.

This maneuver successfully placed the spacecraft into a new orbit with dimensions of 256 kilometers by 121,973 kilometers. The next significant milestone on Aditya-L1’s journey is the Trans-Lagrangian Point 1 Insertion (TL1I) maneuver, scheduled for September 19th at approximately 02:00 Hrs. IST. This maneuver will serve as the spacecraft’s “send-off” from Earth, propelling it further along its nearly 110-day trajectory to reach the L1 Lagrange point.

Aditya-L1 is India’s first space-based observatory designed to study the Sun from a unique vantage point, a halo orbit around the L1 point. It stands as a testament to India’s growing prowess in space exploration and solar science.

The series of earth-bound maneuvers, including the first, second, and third maneuvers performed on September 3rd, 5th, and 10th, respectively, are integral to the spacecraft’s 16-day journey around Earth. These maneuvers are essential in building the necessary velocity required for Aditya-L1 to reach its ultimate destination around the L1 Lagrange point.

Once it arrives at the L1 point, Aditya-L1 will execute another crucial maneuver that will bind it to an orbit around L1. This point represents a balanced gravitational location between Earth and the Sun. The satellite will spend its mission life orbiting L1 in an irregularly shaped orbit, situated in a plane roughly perpendicular to the line joining Earth and the Sun.

The successful launch of Aditya-L1 took place on September 2nd, when ISRO’s Polar Satellite Launch Vehicle (PSLV-C57) catapulted the spacecraft into space from the Second Launch Pad of the Satish Dhawan Space Centre (SDSC) in Sriharikota. After a 63-minute and 20-second flight, Aditya-L1 was injected into an elliptical orbit measuring 235 kilometers by 19,500 kilometers around Earth.

One of the most significant advantages of placing a spacecraft in a halo orbit around the L1 point is its uninterrupted view of the Sun without any occultation or eclipses. This continuous observation capability is invaluable for studying solar activities and their impact on space weather in real-time.

Aditya-L1 is equipped with seven scientific payloads, all indigenously developed by ISRO in collaboration with national research laboratories, including the Indian Institute of Astrophysics (IIA) in Bengaluru and the Inter-University Centre for Astronomy and Astrophysics (IUCAA) in Pune. These payloads are designed to observe various aspects of the Sun, including the photosphere, chromosphere, and the outermost layers known as the corona, using electromagnetic particle and magnetic field detectors.

Furthermore, Aditya-L1’s unique position at L1 allows four of its payloads to directly observe the Sun, while the remaining three conduct in-situ studies of particles and fields at this Lagrange point. These scientific instruments are expected to provide crucial insights into phenomena such as coronal heating, coronal mass ejection, pre-flare and flare activities, space weather dynamics, and the propagation of particles and fields in the interplanetary medium.

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