China's first lunar probe, Chang'e-1, started braking at perilune, which will help it slow down to enter the moon's orbit. Instructions for the braking was issued by the Beijing Aerospace Control Center (BACC) at around 11:15 a.m., Nov. 5, 2007, when the probe reached a position 200 km away from the moon. (Xinhuanet Photo)
Special report: China launches its first moon
BEIJING, Feb. 15 (Xinhua) -- China's space
technicians are preparing for the first major challenge faced by lunar satellite
Chang'e-1 when the Earth eclipses the sun and blocks the supply of solar energy
on Feb. 21.
Scientists have had to redirect the orbit of the
satellite, which has been operating for 100 days as of Friday, in order to
shorten the time it is out of direct sunlight.
The satellite, which has completed 1,135 orbits of
the moon, would have been hidden from the solar rays for three to four hours,
causing a possible power shortage, said Zhu Mincai, director of the Beijing
Aerospace Control Center (BACC).
The adjustment would shorten the time to two hours,
ensuring enough solar power for the orbiter, said Zhu.
The eclipse will coincide with this year's
traditional Chinese Lantern Festival when the moon will be wholly shadowed by
Some facilities would be temporarily switched off
during the eclipse, but this would have no major impact on the satellite's
operation, said BACC scientist Liu Congjun.
The satellite would perform a second orbital
adjustment during another eclipse in August, Liu said.
The 2,350-kilogram satellite carrying eight surveying
facilities aims to make a three-dimensional survey of the moon's surface. It
will also analyze the abundance and distribution of elements on the lunar
surface, investigate the characteristics of the powdery soil layer on the
surface, and explore the environment between the Earth and the moon.
The is the first step in China's three-stage moon
mission, which will lead to a landing and launch of a rover vehicle around 2012.
In the third phase, another rover will land and return to the Earth with lunar
soil and stone samples for scientific research around 2017.