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Born on this day
François Félix Tisserand
2nd week in year
13 January 2019

Important eventsBack

The launch od Dong Fang Hong I24.4.1970

Wikipedia (21 Mar 2013, 15:51)

Dongfanghong I (Red East 1) (simplified Chinese: 东方红一号; traditional Chinese: 東方紅一號; pinyin: Dōngfānghóng Yīhào), also known as China 1, was the People's Republic of China's first space satellite, launched successfully on April 24, 1970 (after one failed attempt on November 16, 1969) as part of the PRC's Dongfanghong space satellite program. At 173 kg (380 lb), it was heavier than the first satellites of other countries. The satellite carried a radio transmitter. It broadcast the song of the same name, Dōngfānghóng or "The East Is Red", which lasted for 26 days while in orbit.

It was developed under the direction of Qian Xuesen (Tsien Hsue-shen), dean at the Chinese Academy of Space Technology. At the time, a total of five identical satellites were created. The first satellite launched successfully. The academy formulated a "Three-Satellite Plan" consisting of Dongfanghong I, re-entry satellites, and geosynchronous orbit communications satellites. Sun Jia-Dong was responsible for the Dongfanghong I technology. In 1967, Dang Hongxin chose a copper antenna membrane that resolved the difficulties of broadcasting on an ultra-short wave antenna between 100°C and −100°C. Engineers installed a music player playing "The East is Red" on the satellite.

While Dongfanghong I was transported to the launch site by train, armed guards were placed between every two electricity poles. On April 24, 1970 at 9:35 pm, a Long March I rocket (CZ-1) lifted off from the China's Jiuquan Satellite Launch Center, placing the Dongfanghong I satellite in orbit at 9:48 pm.

The primary purpose of the Dongfanghong I satellite was to perform tests of satellite technology and take readings of the ionosphere and atmosphere. The satellite is similar in shape to a symmetrical 72-faced polyhedron, had a mass of 173 kg (381 lb), and had a diameter of approximately one meter (39 in). It spun 120 times per minute for stabilization. The outer surface was coated with a processed aluminum alloy for temperature control. The main body of the sphere had four ultrashortwave whip antennas of at least two meters (6½ ft) in length. The lower section was connected to a stage containing a rocket motor. The perigee of its orbit was 441 kilometers and apogee was 2,386 kilometers (274 by 1,483 mi) and had an inclination of 68.55 degrees. This near-earth elliptical orbit was 114.09 minutes per orbit.

Dongfanghong I had a design life of 20 days (in actuality, it lived for 28 days). During that time, it transmitted telemetry data and space readings to the earth. On May 14, its signal stopped.

With the successful launch of Dongfanghong I, China became the fifth country after the Soviet Union, United States, France, and Japan to independently launch a satellite. Although Dongfanghong I was launched 13 years after Sputnik I, its mass exceeded the combined masses of the first satellites of the other four countries. With this successful launch, China became a member of the "Space Club". After this launch, Qian Xuesen proposed to the Chinese government that China should develop a manned space program and submitted a manned space undertaking report. Mao Zedong himself signed "approved" to the report.[citation needed]

On April 21, 2005, the Chinese Academy of Space Technology gathered the science and technology personnel who participated in the design, manufacture, production, and supervision of Dongfanghong I. The birthplace of Dongfanghong I, the Beijing Satellite Manufacturing Plant, was used as a monument. The manufacturing plant, in coordination with the Shenzhou 5 manned spacecraft anniversary, created a 1:1 scale replica of the Dongfanghong I satellite. It was exhibited in the Beijing Planetarium.

Dongfanghong I has a shiny metallic ring added to the bottom, with brightness magnitude from +5 to +8. It is still in space at a higher, safer orbit at 431 to 2,124 km, as object 4392 in the log of US Space Command.
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