Aditya-L1 achieved which orbital milestone on 6 Jan 2024?

Correct option is B

The correct answer is (b) Halo-orbit insertion around Sun-Earth L₁
Explanation:
· India's first solar observatory, the  Aditya-L1 spacecraft, was successfully inserted into its final targeted  halo orbit around the Sun-Earth Lagrange Point 1 ( L1) on January 6, 2024, at approximately 4:17 PM IST.
· This critical maneuver was achieved by firing the spacecraft's control engines for a short duration, marking the end of a roughly 110-day cruise phase after its launch on September 2, 2023. 
Information Booster:
· The L1 point is located about 1.5 million kilometers from Earth, providing a unique and uninterrupted view of the Sun without any eclipses or occultations, which is ideal for solar observation missions.
· A satellite in a halo orbit around L1 is subjected to various perturbing forces; therefore, periodic station-keeping maneuvers are required to maintain its position, minimizing fuel consumption and ensuring a mission lifetime of approximately 5 years.
· The success of this insertion demonstrates ISRO's capabilities in complex orbital dynamics and navigation, which provides confidence for handling future interplanetary missions. 
Additional Knowledge:
(a) Insertion into GEO for Sun imaging (Option a)
· Geostationary Earth Orbit (GEO) satellites orbit Earth at a high altitude (around 35,786 km) and appear stationary relative to the ground. Aditya-L1 is in a halo orbit 1.5 million km from Earth, far beyond GEO. 
(c) Transfer to L₂ (Option c)
· The L2 point is located behind Earth (away from the Sun), which is primarily used for deep space observatories like the James Webb Space Telescope. Aditya-L1's destination was L1, between the Sun and Earth. 
(d) Earth flyby for gravity assist (Option d)
· Earth flyby maneuvers were performed in the initial phase of the mission (September 2023) to gain velocity and escape Earth's sphere of influence, but not the final orbital insertion on January 6, 2024.