按照計劃，印度探月衛星11月8日進入月球軌道 大家不要“著急” (圖)

Mission Sequence 任務次序

Chandrayaan-1 spacecraft would be launched from the Satish Dhawan Space Centre, SHAR, Sriharikota by PSLV-XL (PSLV-C11) in an highly elliptical initial 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 would be done, when the spacecraft is near perigee, to raise the apogees to 37,421 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 would be raised to an orbit with 1,019 km perigee and 386,194 km apogee.

Once the Chandrayaan-1 spacecraft reaches the vicinity of the Moon, the spacecraft is slowed down sufficiently so as to enable the gravity of the moon capture it into an elliptical orbit (LC). After a careful and detailed observation the height of the spacecraft\'s orbit will be finally lowered to its intended 100 km circular polar orbit. Following this, the Moon Impact Probe (MIP) would be ejected from Chandrayaan-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.



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Chandrayaan 1, India\'s first robotic mission to leave Earth orbit, will fire its own engine up to five times in the next two weeks to gradually reach a 250,000-mile-high orbit taking the spacecraft to the vicinity of the moon.

The probe will fire its engine again Nov. 8 to enter lunar orbit. The burn is scheduled to begin at about 1227 GMT (7:27 a.m. EST) to place Chandrayaan 1 in an oval-shaped parking orbit. That orbit will eventually be lowered to a circular path about 62 miles above the moon.

Plans call for Chandrayaan 1 to release a 64-pound impactor around Nov. 15 for a suicidal nosedive into the moon. The trip from orbit to the lunar surface will take about a half-hour, and the small craft will relay imagery, altitude information and spectral data back to Earth through the Chandrayaan mother ship.