| Primary satellite | Secondary satellite |
| Name | Oscar 19 | Cosmos 858 |
| Spacetrack catalog number | 20442 | 9443 |
| Radar cross section | medium | large |
| Epoch of two-line elements (UTC) | 2025 Jan 19 13:43 | 2025 Jan 19 11:12 |
| Time of closest approach (UTC) | 2024 Dec 08 00:34:33.253 |
| Minimum distance | 5.782 km |
| Height difference | 0.735 km |
| Relative speed | 12.924 km/s |
| Angle between velocity vectors | 120° |
| Geographic position | 74.1°N, 105.3°E |
| Height | 789 km |
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