23 Oct 2023: China launched a Long March 2D from the Xichang Satellite Launch Center in southwest China carrying three satellites, Yaogan-39-04 A/B/C. This is the 14th satellite trio China has launched since 2022. YG-39-04 satellites are in the same orbit as previous YG-35, 36 and 39 satellites with an altitude of ~500km and 35° inclination. YG-39-05 is scheduled for launch on ~ 11 Nov 2023 and is believed to be the final piece to this new ISR constellation.
– 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.
-YG-39-04’s launch vehicle (LM-2D) and location (Xichang) matches all 13 previous YG-35, YG-36 & YG-39 launches.
– YG-39-04A/B/C are still conducting initial maneuvers and it is too early for analysts to assess formation.
– As with its predecessors, YG-39-04 satellites are co-planar with other YG-35 and YG-36 satellites. In this case YG-39-04 is co-planar with YG-35-05 and YG-36-03.
– 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 (launch ~11 Nov)
- 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 while also grappling with anomalies from at least two of the 39 satellites.
– Per the 2023 DoD Annual Report to Congress: China’s “… 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 42 YG-35/36/39 satellites appear to be optimized to perform such monitoring.