发信人: ZZGR (闲逛), 信区: Aviation [删除]
标 题: Chandrayaan-1 Mission Profile from ISRO
发信站: BBS 未名空间站 (Wed Oct 22 14:22:56 2008)
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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