Why in the News?

The TransLunar Injection (TLI) was performed successfully from ISRO Telemetry, Tracking and Command Network (ISTRAC) in Bengaluru recently.

What is the TransLunar Injection (TLI)?

• TransLunar Injection (TLI) is a crucial space mission maneuver, propelling spacecraft from Earth's orbit to a trajectory aimed at reaching the Moon.
• An essential step in lunar missions, TLI allows spacecraft to break free from Earth's gravity and commence their journey toward the Moon.
• TLI is executed when the spacecraft reaches the perigee, the closest point to Earth in its orbit.
• During TLI, the spacecraft's propulsion system ignites its engines, accelerating the craft and providing the necessary speed to escape Earth's gravitational pull.
• The thrust and duration of the TLI burn are determined by factors like spacecraft mass, Earth's orbital velocity, and specific mission objectives.
• Following a successful TLI, the spacecraft is directed onto a lunar trajectory, continuing its autonomous journey to the Moon without further reliance on Earth's propulsion.
• Subsequent to TLI, the spacecraft enters a transfer orbit, an elliptical path that intersects with the Moon's orbit.
• The spacecraft traverses this highly eccentric orbit until it reaches the lunar surface.
• As the spacecraft approaches the Moon, additional maneuvers like lunar orbit insertion (LOI) may be executed to enter lunar orbit or facilitate landing, based on the mission's objectives.
• TLI has been effectively utilized in numerous Moon missions, including Apollo, Chang'e, and Artemis missions.