Kosmos-2521 beside Kosmos-2519
An object of Central Sci. Res. Inst. for Chemistry and Mechanics came up beside an object of Topographics Service of the Russian Armed Froces, 2 km away at the nearest its sources state.
Reported: 1 public report other than Orbinauts names these two.
From the public record
- From
- Aug 23, 2017
- to Dec 15, 2017
- Closest stated
- 2 km
- Oct 18, 2017
- Orbit
- LEO
- low Earth orbit
The one that moved
Kosmos-2521
Central Sci. Res. Inst. for Chemistry and Mechanics, RU
42919 · 2017-037 · launched Jun 23, 2017
The one it came up to
Kosmos-2519
Topographics Service of the Russian Armed Froces, RU
42798 · 2017-037 · launched Jun 23, 2017
What the sources state
Every day and distance here is the sources’ own, to the precision they state.
- When
- Aug 23, 2017 to Dec 15, 2017
- Same planeAug 23, 2017
- ejected from Kosmos 2519 on 23 August 2017
- BesideOct 11, 2017 to Oct 18, 2017
- re-approach to about 10 km by 11 October 2017, 2 km by 18 October
- Closest statedOct 18, 2017
- 2 km by 18 October 2017
- LeftDec 15, 2017
- Kosmos 2519 made a 7 km flyby of 2521 on 15 December 2017; 2521 a 24 km flyby on 26 March 2018
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 |
|---|---|---|
| Apr 28, 2025 | Analyst | Jonathan McDowell, "Nivelir" timeline, planet4589.org, and Bart Hendrickx, The Space Review, 28 April 2025 |