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Tue, Nov 11, 2008

India's Chandrayaan-1 Now In Lunar Orbit

Gradually Pulling Closer To Surface

Chandrayaan-1, the Indian Space Research Organization's (ISRO) lunar orbiter, was captured into orbit around the Moon on November 8. One day later, the spacecraft performed a maneuver that lowered the closest point of its orbit down to 200 km from the Moon.

The spacecraft's liquid-fuel propelled engine was fired at 12:21 CET (16:51 Indian Standard Time) when it was at a distance of about 500 km from the Moon. This reduced the spacecraft's velocity, enabling the Moon's gravitational field to capture Chandrayaan-1 into lunar orbit. In this configuration, the orbit's point closest to the lunar surface was at 504 km and the spacecraft circled the Moon in 11 hours.

This lunar orbit insertion maneuver was executed from the Chandrayaan-1 Spacecraft Control Center at ISRO's Telemetry, Tracking and Command Network at Bangalore. The performance of all the systems on board Chandrayaan-1 was registered as normal.

On Monday, at 15:33 CET (20:03 Indian Standard Time), the spacecraft's engine was fired for about 57 seconds, reducing the orbit's point closest to the lunar surface to 200 km while the farthest point remained unchanged at 7502 km. In this elliptical orbit, Chandrayaan-1 takes about ten and a half hours to circle the Moon once.

Over the next few days, the height of the spacecraft's orbit around the Moon will be carefully reduced in steps to achieve a final 100-km polar lunar orbit. The Moon Impact Probe (MIP) will then be released to hit the lunar surface, after which the other instruments on board will be turned on.

As ANN reported, Chandrayaan-1 was launched October 22 by from India's spaceport at Satish Dhawan Space Center SHAR, Sriharikota. The launcher placed the spacecraft in an elliptical orbit around Earth.

In the past two weeks, the Terrain Mapping Camera (TMC), one of the 11 scientific instruments of the spacecraft, was successfully operated twice to take pictures, according to the ISRO.

FMI: www.isro.org/, www.chandrayaan-i.com/index.html

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