| Primary satellite | Secondary satellite |
| Name | NOSS 8 (H) | COSMOS 2251 DEB |
| Spacetrack catalog number | 18025 | 39585 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 22 10:01 | 2021 Jan 22 10:24 |
| Time of closest approach (UTC) | 2020 Dec 04 18:44:59.606 |
| Minimum distance | 126.615 km |
| Height difference | -8.153 km |
| Relative speed | 12.542 km/s |
| Angle between velocity vectors | 110° |
| Geographic position | 49.5°N, 161.4°W |
| Height | 679 km |
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