Issue 87

China: LM-5 Launches with Yaogan-41 to GEO

15 Dec: China launched its most powerful rocket – the Long March-5 with an extended fairing – from Wenchang, carrying the Yaogan-41 satellite to Geostationary Transfer Orbit (GTO). As of 22 Dec, YG-41 remained in GTO. Launch Video . - China provided no images nor further details regarding YG-41 mission or capabilities…

15 Dec: China launched its most powerful rocket – the Long March-5 with an extended fairing – from Wenchang, carrying the Yaogan-41 satellite to Geostationary Transfer Orbit (GTO). As of 22 Dec, YG-41 remained in GTO. Launch Video.

– China provided no images nor further details regarding YG-41 mission or capabilities. Xinhua news described the satellite as an optical remote sensing satellite.

-The LM-5 included a new, elongated 18.5 m long, 5.2 m diameter payload fairing. The new fairing was 6.2 m (20 ft) longer than previous fairings (12.3 m). With the extended fairing, this was the tallest rocket China has ever flown (200 ft).

– The Yaogan series satellites are typically designated for military purposes. The classified nature of the mission suggests YG-41 has at least a partial military mission.

-From its perch in GEO, YG-41 will have a field of view covering about one-third of Earth’s surface. Geostationary optical data would be useful for security, meteorology, climate studies, and environmental monitoring purposes.

-Given the LM-5’s launch capacity and the extended fairing, YG-41 may use the DFH-5 bus. CAST produces the DFH-5 large satellite bus for GEO communications and remote sensing. The only other DFH-5 on orbit is the Shijian-20, which has a mass of up to 8,000 kg. DFH-5 satellites have a lifetime of up to 15 years.

– YG-41 will be China’s 4th optical satellite in GEO. It will join the civilian Gaofen-4 (2015), Gaofen-13-01 (2020) and Gaofen-13-02 (2023). China also recently added the world’s first SAR imaging satellite in GEO, Ludi Tance 4-01.

Although Chinese officials did not disclose the exact capabilities of Yaogan-41, it would almost certainly have the sensitivity to continually track US Navy ships and allied vessels across a wide

swath of the Indo-Pacific. Aside from its use of the larger payload fairing, the Long March 5 rocket used to launch Yaogan-41 can haul approximately 31,000 pounds (14 metric tons) of payload mass into the orbit reached following Friday’s launch.

Prior to this launch (exact date unknown), Li Guo, chief designer of Gaofen-4, talked about high-res optical imaging technology from GEO and described a rough evolutionary path:

1st stage Gaofen-4 with 50m resolution (Gaofen-4)

2nd stage 15m resolution, (Gaofen-13)

3rd stage 3-5m resolution with 3-4m mirror, (Yaogan-41?)

4th stage 1-2m resolution using “Open system imaging”, “quantum imaging system”, “thin film radiographic imaging system” etc.

Feb 2023: Extended Fairing Under Construction in Tianjin

(CNSpaceflight, NASASpaceflight)