China's lunar probe Chang'e-1 completed its second orbital
transfer on Friday afternoon, one more step forward in its
380,000-km journey to the moon.
The Beijing Aerospace Control Center (BACC) issued the
instruction for the orbital transfer at around 4:50 pm. The orbital
transfer was effected at 5:44 pm.
The probe is now moving on a 24-hour orbit with an apogee of
70,000 kilometers, up from the former 50,000 km, according to
information from the Yuanwang III space tracking ship at the
southern Pacific.
It will stay on the orbit for three days and then move further
from the earth to a 48-hour orbit on Oct. 29, according to the BACC
sources.
The lunar probe completed its first orbital transfer Thursday
afternoon, in which it was transferred to a 16-hour orbit with a
perigee of about 600 km from 200 km.
The first probing equipment on the lunar orbiter started
Thursday evening to explore the space environment between earth and
moon.
The high-energy solar particle detector, which was positioned on
board the satellite with seven other probing facilities, will
collect data on the space expanse between 40,000 and 400,000
kilometers from earth.
Chang'e-1, named after a mythical Chinese goddess who, according
to legend, flew to the moon, blasted off on a Long March 3A carrier
rocket at 6:05 p.m. Wednesday from the Xichang Satellite Launch
Center in the southwestern province of Sichuan.
The satellite is expected to enter earth-moon transfer orbit on
Oct. 31 and arrive in the moon's orbit on Nov. 5.
The 2,300-kg moon orbiter carried eight probing facilities,
including a stereo camera and interferometer, an imager and
gamma/x-ray spectrometer, a laser altimeter, a microwave detector,
a high energy solar particle detector and a low energy ion
detector.
It will fulfill four scientific objectives, including a
three-dimensional survey of the Moon's surface, analysis of the
abundance and distribution of elements on lunar surface, an
investigation of the characteristics of lunar regolith and the
powdery soil layer on the surface, and an exploration of the
circumstance between the earth and the moon.
The satellite will relay the first picture of the moon in late
November and will then continue scientific explorations of the moon
for a year.
China's lunar orbiter project has cost 1.4 billion yuan (187
million U.S. dollars) since research and development of the project
was approved at the beginning of 2004.
The launch of the orbiter marks the first step of China's
three-stage moon mission, which will lead to a moon landing and
launch of a moon rover at around 2012. In the third phase, another
rover will land on the moon and return to earth with lunar soil and
stone samples for scientific research around 2017.
China carried out its maiden piloted space flight in October
2003, making it only the third country in the world after the
former Soviet Union and the United States to have sent men into
space. In October 2005, China completed its second manned space
flight, with two astronauts on board.
The launch of Chang'e-1 came shortly after Japan launched its
first lunar probe, Kaguya in mid-September, while India is planning
to send its own lunar probe into space next April, sparking off
concerns of a space race in Asia.
But Luan Enjie, chief commander of China's lunar orbiter
project, said that "China will not be involved in moon race with
any other country and in any form."
"China will, in the principle of pursuing a policy of peaceful
use of airspace, share the achievements of the lunar exploration
with the whole world," he told Xinhua.
(Xinhua News Agency October 26, 2007)