| Primary satellite | Secondary satellite |
| Name | Tiros 1 | COSMOS 2251 DEB |
| Spacetrack catalog number | 29 | 35996 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2021 Jan 16 11:16 | 2021 Jan 16 11:38 |
| Time of closest approach (UTC) | 2020 Dec 07 04:03:13.001 |
| Minimum distance | 11.408 km |
| Height difference | -2.460 km |
| Relative speed | 5.158 km/s |
| Angle between velocity vectors | 40° |
| Geographic position | 41.0°N, 153.8°W |
| Height | 661 km |
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