Issue 65

Shiyan 10-02 Arrives in Molniya Orbit

26 Jan 2023: After disappearing from observations between 29 Dec 2022 and 25 Jan 2023, China's Shiyan 10-02 is now cataloged in a Molniya orbit. The satellite likely conducted a large maneuver shortly after 29 Dec which included a 12° inclination change. A LM-3B initially placed SY-10-02 into a 51° orbit. As of 26 Jan the satellite is no…

26 Jan 2023: After disappearing from observations between 29 Dec 2022 and 25 Jan 2023,

China's Shiyan 10-02 is now cataloged in a Molniya orbit. The satellite likely conducted a large

maneuver shortly after 29 Dec which included a 12° inclination change. A LM-3B initially placed

SY-10-02 into a 51° orbit. As of 26 Jan the satellite is now

in the Classic Molniya orbit of ~63.33°.

– Shiyan 10-02's orbital plane is 103° away from its predecessor, Shiyan 10-01. In this configuration at least one of the satellites has a continuous view of the Earth from the North Pole down to 40-45° latitude. – It is unclear why China launched the satellites into their original 51° orbit. Both satellites launched from Xichang so it is possible there are flight restrictions preventing China from launching directly into a 63° inclined orbit. – Shiyan 10-02 transitioned far more quickly to Molniya than its predecessor. Shiyan 10-01 spent nearly 6 months in its transition orbit. Chinese media reported that the SY-10-01 launch proceeded normally, but the satellite operating

Shiyan 10-02

Shiyan 10-01

conditions were abnormal. It is likely these anomalies delayed the satellite's maneuver to its desired orbit. Shiyan 10-01 and 10-02 are China's only HEO satellites. -China has not released the mission of the Shiyan 10 satellites. The US and Russia have satellites in Molniya orbits and use the ~12hr loiter over Earth's northern latitudes for missile warning, communications and signals intelligence.

APStar-6E Begins Manuever to GEO

25 Jan 2023: China's APSTAR-6E telecommunication

Shiyan 10-02 Arrives in Molniya Orbit

Original PDF links: Source 1 · Source 2 · Source 3 · Source 4