Issue 27

China Launches Tianhui-1 (04)

29 Jul 2021: China launched Long March 2D rocket from the Jiuquan Satellite Launch Center carrying Tianhui 1-04, the fourth in China’s series of Tianhui 1 Earth observation satellites. Launch VIDEO . - The launched placed the approximately 1,000 kg satellite into a 97.3 degree inclined Sun-Synchronous Orbit, around 49…

29 Jul 2021: China launched Long March 2D rocket from the Jiuquan Satellite Launch Center carrying Tianhui 1-04, the fourth in China’s series of Tianhui 1 Earth observation satellites. Launch VIDEO.

– The launched placed the approximately 1,000 kg satellite into a 97.3 degree inclined Sun-Synchronous Orbit, around 490 to 500 kilometers above the surface of the Earth.

– The Tianhui (or “sky drawing”) constellation of satellites are Earth observation satellites built by Dong Feng Hong and operated by the People’s Liberation Army.

– The Tianhui 1 series of satellites began launching in 2010 with the launch of Tianhui 1-01,

– Tianhui 1-02 and 1-03, the second and third spacecraft in the series, were launched in 2012 and 2015 respectively. The three previous Tianhui spacecraft, like 1-04, were also launched aboard Long March 2D vehicles.

– Each spacecraft is built off of the CSAT2000 spacecraft bus and is equipped with a number of electro-optical sensors.

– Like it’s three predecessors, Tianhui 1-04 is equipped with three separate Earth observation cameras: a three-line array panchromatic camera with a spatial resolution of 5m, a panchromatic CCD camera with a spatial resolution of 2m, and a multi-spectral imager with a spatial resolution of 10m.

– There are also 2 Tianhui 2 satellites in orbit. Launched in 2019 they are believed to have a similar mission.

The Tianhui-1 satellites are part of the Ziyuan program that cover different civil and military earth observation as well as remote sensing programs. The Ziyuan-1 program is focused on Earth resources and looks to have two distinct military and civil branches. The Ziyuan-2 program is understood to be used for aerial surveillance, operated by Chinese People’s Liberation Army (PLA), whereas the Ziyuan-3 series will be used for stereo imaging.

Issue 27 - China launches Tianhui-1 (04)

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