Issue 87

China Completes Constellation with YG-39-05 Launch

10 Dec 2023: For the 15th time in 2.5 years, China launched a Long March-2D from Xichang carrying three Yaogan-39 satellites, now in a 495 km orbit with a 35° inclination. This is the fifth trio of Yaogan-39 satellites. China has also launched five sets of Yaogan-35 satellites, as well as five sets of Yaogan-36…

10 Dec 2023: For the 15th time in 2.5 years, China launched a Long March-2D from Xichang carrying three Yaogan-39 satellites, now in a 495 km orbit with a 35° inclination. This is the fifth trio of Yaogan-39 satellites. China has also launched five sets of Yaogan-35 satellites, as well as five sets of Yaogan-36 satellites to the same altitude and inclination. Launch Video.

– Little is publicly known about the Yaogan satellites. State media outlet China Daily described the spacecraft as remote-sensing satellites tasked with observing, surveying and measuring objects on land or at sea, as well as monitoring weather.

– Western observers believe Yaogan satellites have partially military purposes. The wider series includes optical, radar and electronic intelligence gathering satellites.

– Some analysts speculate the A & B spacecraft of the YG-35, 36 and 39 triplets might be imaging satellites, & the C spacecraft might be a radar satellite. SIGINT / ELINT or communications missions are also possibilities.

– YG-39-05’s launch vehicle (LM-2D) and location (Xichang) matches all 14 previous YG-35, YG-36 & YG-39 launches.

– YG-39-05A/B/C are still conducting initial maneuvers, and it is too early for analysts to assess formation. (More on next page).

– As with its predecessors, YG-39-05 satellites are co-planar with other YG-35 and YG-36 satellites. In this case YG-39-05 is co-planar with YG-35-04 and YG-36-05.

– All YG-35/36 and 39 satellites are co-planar with other satellites of this family.

– Here are all five orbits:

  • YG-35-01, YG-36-01 & YG-39-03
  • YG-35-02, YG-36-02 & YG-39-01
  • YG-35-03, YG-36-04 & YG-39-02
  • YG-35-04, YG-36-05 & YG-39-05
  • YG-35-05, YG-36-03 & YG-39-04

– Each group will pass over the same points above Earth at different times, providing more frequent coverage over areas of interest.

  • – More broadly, it appears that China is continuing to experiment with various spacing alternatives for the YG-35/36/39 satellites.

    – Per the 2023 DoD Annual Report to Congress: China is deploying “… ISR systems, most of which could support monitoring, tracking, and targeting of U.S. and allied forces worldwide, especially throughout the Indo-Pacific region. These satellites also allow the PLA to monitor potential regional flashpoints, including the Korean Peninsula, Taiwan, the Indian Ocean, and the South China Sea.”

    – The orbits of the 45 YG-35/36/39 satellites appear to be optimized to perform such monitoring.

The Yaogan-39-05 was the 500th Launch of the Long March Rocket Series

YG-36-05

YG-39-01

YG-39-02

YG-39-03

YG-39-04

YG-39-05 - Patch-Int: Puzzle Complete