Issue 137

China Launches Tianhui-7 Satellite

30 Dec 2025: China launched a Long March-4B with the Tianhui-7 (TH-7) mapping satellite (67300) from Jiuquan. TH-7 is currently in LEO at 485.2km and inclined at 97.42°. Including TH-7 there are now 15 active Tianhui satellites in orbit (all LEO...although TH-1 02's demise appears imminent ). The TH-7 orbit appears…

30 Dec 2025: China launched a Long March-4B with the Tianhui-7 (TH-7) mapping satellite (67300) from Jiuquan. TH-7 is currently in LEO at 485.2km and inclined at 97.42°. Including TH-7 there are now 15 active Tianhui satellites in orbit (all LEO…although TH-1 02’s demise appears imminent). The TH-7 orbit appears similar to that of TH-1 04 (49049) which launched in 2021. Launch Video.

– TH-7’s inclination and SMA resemble those of the TH-1 series. The TH-1 satellites also operated as single satellites, while China launched the TH-2, TH-4, TH-5 and TH-6 satellites in pairs and operate them in formation.

– The Tianhui-1 (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 were launched in 2012 and 2015 respectively.

– TH-1 04 is the only TH-1 series to remain operational. TH-1 01 & 03 have de-orbited and TH-1 02 will de-orbit in the next few weeks.

-Per Gunter’s: TH-1 satellites are “equipped with a three-dimensional survey camera and a CCD camera with a ground resolution of 5 meters…with a camera angle of 25 degrees. Also on board is a multi-spectral camera with a ground resolution of 10 meters…(with a) swath width of the cameras is 60 kilometers wide.

– Assuming TH-7 is a follow-on to the TH-1 satellites it is likely equipped with improved optical sensors.

– Initial observations show TH-7 orbiting at ~10km lower average altitude than TH-1 04 and TH-7 has a 4.2° east RAAN offset with TH-1 04.

– If China were to raise TH-7’s orbit to match that of TH-1 04 the two satellites would maintain their relative positions to one another and enable cooperative operations. (Editor’s note: I have no indications this is planned, just pointing out the possibility. Time will tell.)


Love the smell of Hypergolics in the Morning. LM-4B lift off with TH-7 producing Yellow/Orange toxic cloud.
(nasaspaceflight.com)


Visual Comparison Between TH-1 04 and TH-7 Orbits. TH-7 currently has RAAN offset of 4.2° E to TH-1 04
(spaceaware.io & saberastro.com)