Issue 67

Happy Wanderer: TJS-3 Heads East

21 Feb 2023: Beginning in mid-Nov 2022, TJS-3 began drifting eastward. In late-Jan the satellite increased its altitude to rejoin the GEO belt. It is now holding steady at 137.5° E. It is currently in the vicinity of (IVO) the US Advanced Extremely High Frequency System (AEHF)-6. Since its launch on 24 Dec 2018 TJS-3 has frequently maneu…

21 Feb 2023: Beginning in mid-Nov 2022, TJS-3 began drifting eastward. In late-Jan the satellite

increased its altitude to rejoin the GEO belt. It is now holding steady at 137.5° E. It is currently

in the vicinity of (IVO) the US Advanced Extremely High Frequency System (AEHF)-6. Since its

launch on 24 Dec 2018 TJS-3 has frequently maneuvered and displayed unusual behavior for a

GEO-based satellite. Its maneuvers seem to have placed it in the vicinity of several US military

communications satellites.

– There is little public information available regarding the TJS-3's mission. There is the launch video from 2018 and an excellent COMSPOC video from 2020. – The COMSPOC video describes the unusual interaction between TJS-3 and its Apogee Kick Motor (AKM) shortly after arriving in GEO. – There is speculation that TJS-3 might be a military SIGINT or early warning satellite. The satellite is reportedly built on the SAST-5000 all electric bus and features a multi-frequency and high speed communications payload. – TJS-3 began its latest maneuvers in early July 2022 and has made brief stops near US Military COMSATs WGS F4 (USA 233) and AEHF-6 (USA 298). As of 22 Feb, TJS-3 remained IVO AEHF-6. – IVO is a very loose term since to date the closest approach between TJS-3 and AEHF-6 has been 181.35km. – WGS F4 is a US military communications satellite as part of the Wideband Global SATCOM program, launched in 2012. – AEHF-6 is a military communications satellite. AEHF-6 was launched in 2020 and completed the AEHF constellation of 6 satellites. – Since its arrival at GEO in 2018, TJS-3 appears to have visited other US satellites, primarily COMSATS. – The earliest instance was with MUOS-4 for over a year, then with Quasar 13 (US Relay satellite). – TJS-3 first visited WGS F4 in early 2021 and remained in the area for several months. It then rejoined its AKM later in 2021. While it may be an erroneous reading, it appears TJS-3 briefly maneuvered to the vicinity of USA 118 which is speculated to be a US ELINT or SIGINT satellite.

SMA (Altitude)

Longitude

TJS-3 Maneuvers in Mar 2022-Feb 2023

IVO MUOS 4

IVO WGS F4

IVO Quasar 13

IVO AEHF-6

IVO USA 118

AEHF-6

TJS-3

Current TJS-3 and

AEHF-6 Orbits

Happy Wanderer: TJS-3 Heads East

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