Shi Jian 21 beside Shi Jian 25
A satellite of Shanghai Academy of Space Technology (CASC 8th Acad) came up beside a satellite of Shanghai Academy of Space Technology (CASC 8th Acad), 0 km away at the nearest its sources state.
Reported: 2 public reports other than Orbinauts name these two.
From the public record
- From
- Jun 5, 2025
- to Nov 25, 2025
- Closest stated
- 0 km
- Jul 2, 2025
- Orbit
- GEO
- geostationary orbit, over 127.6° E
The one that moved
Shi Jian 21
Shanghai Academy of Space Technology (CASC 8th Acad), CN
49330 · 2021-094A · launched Oct 24, 2021
The one it came up to
Shi Jian 25
Shanghai Academy of Space Technology (CASC 8th Acad), CN
62485 · 2025-002 · launched Jan 6, 2025
What the sources state
Every day and distance here is the sources’ own, to the precision they state.
- When
- Jun 5, 2025 to Nov 25, 2025
- BesideJun 5, 2025 to Jun 11, 2025
- SJ-21 drifted from 134.25 E (burn 2 June 2025 15:49 UTC) to SJ-25, arriving 127.6 E on 5 June; first approach to about 50 km on 11 June about 01:21 UTC
- Closest statedJul 2, 2025
- docked: visually merged from 2 July 2025
- LeftNov 25, 2025
- On 25 November at 06:33 UTC, SJ-25 executed an in-track burn consistent with an undock or separation maneuver
The detector was not yet running: it reads low Earth orbit since April 2026 and the geostationary belt since October 2026.
Reported elsewhere
Who else said these two were together, earliest first.
| Said on | Who | What |
|---|---|---|
| Jun 9, 2025 | Tracker | COMSPOC on X, 9 June 2025, and Integrity ISR, Integrity Flash issue 123, 23 June 2025 |
| Dec 3, 2025 | Tracker | COMSPOC, as quoted by Phoebe Zhang, South China Morning Post, 13 July 2025, and COMSPOC on X, 3 December 2025 |