| Primary satellite | Secondary satellite |
| Name | Sich 1 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 23659 | 37508 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 20 11:19 | 2021 Jan 19 01:23 |
| Time of closest approach (UTC) | 2020 Dec 06 01:01:39.930 |
| Minimum distance | 38.591 km |
| Height difference | 1.786 km |
| Relative speed | 14.789 km/s |
| Angle between velocity vectors | 156° |
| Geographic position | 10.8°S, 116.8°E |
| Height | 630 km |
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