Issue 71

On-Orbit Updates

TJS-3 Update: TJS-3 continues to drift eastward and has not altered its SMA since dropping 63.1km between 24-26 Mar 2023. Latest observations have the satellite at 160.2°E and drifting ~.8° per day. SJ-23 & TL-1-03 Update: SJ-23, an experimental Chinese satellite with unknown capabilities, drifted in vicinity of a…

TJS-3 Update: TJS-3 continues to drift eastward and has not altered its SMA since dropping 63.1km between 24-26 Mar 2023. Latest observations have the satellite at 160.2°E and drifting ~.8° per day.

SJ-23 & TL-1-03 Update: SJ-23, an experimental Chinese satellite with unknown capabilities, drifted in vicinity of a Chinese Relay Satellite, Tianlian-1-03 in late Feb through mid-Mar. SJ-23 continued west, away from TL-1-03 for several days and then dropped ~44.2kms altitude to reverse course between 14-16 Apr 2023. As it drifted east SJ-23 crossed TL-1-03 at 20.4°E on ~16 April. As of 23 Apr 2023, SJ-23 remains eastward bound, drifting .~6° per day.

China Spaceplane Update: On 13 April 2023, China’s spaceplane reduced its altitude 43%, from 601.3 to 342.0 kms SMA. This new mission phase could indicate preparations for landing of the reusable spaceplane – or something new entirely. Since the spaceplane launched in Aug 2022, it has made multiple large maneuvers raising the object’s altitude – as well as repeated deployments, formation flying, and docking of a sub-satellite OBJECT J (NORAD ID 54218).

Chinasat 20A (Shentong 1B): On 13 Apr 2023, China raised the orbit of Chinasat 20A ~540km placing the satellite above the traditional “graveyard” orbit. Chinasat 20A was launched in 2010 as a suspected Chinese military COMSAT. The Shentong provide Ku-band communication with advanced multiple steerable spot beam antenna technology. This enables ground users to communicate while on the move and use secured uplink transmission for satellite antenna control.

Yaogan (YG)-35/36 Constellation Update: With the exception of YG-35-02 A/B/C all of the YG-35 and 36 triplets have stabilized their orbits with SMAs of ~490km. This is a decrease from their previous avg SMA of 497kms and likely a result of experimentation to improve collection of whatever sensors are on-board the spacecraft. YG-35-02 A/B/C satellites continue to gradually decrease their SMA and have not maneuvered in several weeks. In particular, YG-35-02 C has not maneuvered in nearly 6 months.

TJS-3 drifting eastward

TJS-3 longitude and semi-major axis

SJ-23 longitude and semi-major axis

Shijian 23 and Tianlian 1-03

SJ-23 and TL-1-03 drifting eastward

China spaceplane altitude reduction

Previous orbit (orange) and current orbit (blue)

Chinasat 20A orbit raised above the traditional graveyard orbit

Yaogan 35-02C continues to lose altitude