| Primary satellite | Secondary satellite |
| Name | Cosmos 921 Rocket | SL-24 R/B |
| Spacetrack catalog number | 10096 | 39228 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2025 Nov 17 20:26 | 2025 Nov 17 15:43 |
| Time of closest approach (UTC) | 2025 Oct 15 15:44:17.730 |
| Minimum distance | 12.303 km |
| Height difference | -1.342 km |
| Relative speed | 15.305 km/s |
| Angle between velocity vectors | 173° |
| Geographic position | 12.7°N, 92.1°E |
| Height | 565 km |
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