Chandrayaan-1 spacecraft was launched from the Satish Dhawan Space Centre, SHAR, Shriharikota by PSLV-XL (PSLV – C11) in an highly elliptical orbit (IO) with perigee (nearest point to the Earth) of about 257 km and an apogee (farthest point from the Earth) of about 22,858 km.
After a Few revolutions in the initial orbit, the spacecraft’s Liquid Apogee Motor (LAM) firing was done, when the spacecraft was near perigee, to raise the apogees to 37,241 km and 73,925 km respectively.
Subsequently, the LAM is fired to take the Chandrayaan-1 spacecraft to extremely high elliptical orbit with apogees 199,277 km and 269,201 km. Later the spacecraft was raised to an orbit with 1,019 km perigee and 386,194 km apogee.
When the Chandrayaan-1 spacecraft reached the vicinity of the Moon, the spacecraft is slowed down sufficiently so as to enable the gravity of the moon capture into an elliptical orbit (Lc). After a careful and detailed observation the height of the spacecraft finally lowered to its intended 100 km circular polar orbit. Following this, the Moon Impact Probe (MIP) is ejected from Chandrrayaan-1 to impact on the lunar surface. Afterwards, all the scientific instruments/payloads are commissioned sequentially and Chandrayaan-1 spacecraft explores the Moon with its array of instruments for two years.