Issue 86

Exit Stage Left: SJ-23 Heads West

2 Dec 2023: SJ-23 increased its altitude ~45 km and initiated a westward drift. SJ-23 had been located at 171.4° E, just to the East of the Chinese Tianlian-2-02 Data Relay Satellite (which has been located at 171.0° E since it arrived at GEO in Jan 2022). As SJ-23 moved westward there were two “close” approaches on 5…

2 Dec 2023: SJ-23 increased its altitude ~45 km and initiated a westward drift. SJ-23 had been located at 171.4° E, just to the East of the Chinese Tianlian-2-02 Data Relay Satellite (which has been located at 171.0° E since it arrived at GEO in Jan 2022). As SJ-23 moved westward there were two “close” approaches on 5 Dec 2023; the first the two satellites came within ~25 km, the second resulted in the satellites came within ~40 km of one another. Chances of collision were minimal and there does not appear to be additional maneuvering other than the altitude change. As of 8 Dec SJ-23, remained at its higher altitude, was at 168.9°E and continuing to move westward at ~0.6° per day. Watch LSAS Video recreation.

Longitude comparison between SJ-23 (red) and Tianlian-2-02 (green), 1-6 Dec 2023 (LSAS).

Point of closest approach between SJ-23 and Tianlian-2-02 on 5 Dec 2023 (LSAS).

Radial, in-track and cross-track separation between SJ-23 and Tianlian-2-02 (LSAS).