| Primary satellite | Secondary satellite |
| Name | Cosmos 1821 Rocket | METEOR 2-20 DEB |
| Spacetrack catalog number | 17526 | 59997 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 Apr 29 04:46 | 2025 Apr 27 13:25 |
| Time of closest approach (UTC) | 2024 Jul 25 16:54:38.784 |
| Minimum distance | 4497.842 km |
| Height difference | 15.947 km |
| Relative speed | 13.900 km/s |
| Angle between velocity vectors | 141° |
| Geographic position | 61.3°S, 104.4°W |
| Height | 970 km |
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