Aditya-L1

[14] The main objectives of Aditya-L1 are: The mission was conceptualised in January 2008 by the Advisory Committee for Space Sciences (ADCOS).

[16][17] It was initially envisaged as a small, 400 kg (880 lb) satellite in a Low Earth Orbit (800 km) with a coronagraph to study the solar corona.

[22] On 11 January 2024, ISRO successfully deployed a 6-meter magnetometer boom aboard the Aditya-L1 in the Halo orbit at the Lagrange Point L1.

In order to reduce the impact of the spacecraft's magnetic field on measurements, the sensors are placed 3 and 6 meters away from the craft.

Using a dual sensor system also helps to cancel out the spacecraft's magnetic influence and facilitates accurate estimation.

Through the use of spring-driven hinge mechanisms, the five pieces are joined to enable folding in close proximity to the craft throughout the journey and opening up upon reaching the desired orbit.

Information obtained via the telemetry switches validates the release of the hold-down, the initial motion, and the locking of every hinge.

[25] The spacecraft is planned to remain in the halo orbit for its mission duration while being maintained at a stationkeeping Δv of 0.2–4 m/s per year.

[29] In addition, it is not understood exactly how the Sun's radiation affects the dynamics of the Earth's atmosphere on a shorter as well as a longer time scale.

Thus, the mission will enable a comprehensive understanding of the dynamical processes of the Sun and address some of the outstanding problems in solar physics and heliophysics.

[31] The SUIT is an ultraviolet imaging telescope designed to study the solar spectral radiation in the ultraviolet range, using narrowband and broadband spectral filters in the range of 200-400 nm with the hope of developing a better understanding between solar activity and the atmospheric dynamics of Earth.

The SoLEXS will observe solar flares, and in conjunction with data provided by the VELC, will help study the complex thermal properties of the Sun's outer layers.

Using a twin-pair of Cadmium Telluride (CdTe) and Cadmium Zinc Telluride (CZT) detectors, the instrument aims to study the acceleration and movement of electrons in the Sun's corona, as well as to study the cut-off energy between thermal and non-thermal solar emissions.

The purpose of these sensors is to gather information about the magnitude and direction of the Interplanetary Magnetic Fields (IMF), as well as to study other events such as Coronal Mass Ejections (CME).

Aditya-L1, following a flight duration of 63 minutes and 20 seconds, achieved a successful injection into an elliptical orbit around the Earth at 12:54 IST.

On 19 September 2023, Aditya-L1 performed its last maneuvre around Earth to escape its orbit and headed towards the Lagrange 1 point, taking at least four months to further reach its destination, 1.5 million kilometers away.

It was needed to correct the trajectory evaluated after tracking the Trans-Lagrangian Point 1 Insertion (TL1I) maneuvre performed on 19 September 2023.

Aditya-L1 in stowed configuration
Aditya-L1 in deployed configuration
Lagrange points in the Sun–Earth system (not to scale) – a small object at any one of the five points will hold its relative position.
The Aditya spacecraft before integration with the PSLV rocket
Flight Sequence of PSLV-C57
PSLV-C57 on launch pad housing Aditya-L1
Trajectory of PSLV-C57/Aditya L1 Mission