| Primary satellite | Secondary satellite |
| Name | SMAP | COSMOS 2251 DEB |
| Spacetrack catalog number | 40376 | 34744 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 16 21:47 | 2021 Apr 16 16:18 |
| Time of closest approach (UTC) | 2021 Mar 05 11:47:49.419 |
| Minimum distance | 47.376 km |
| Height difference | 2.069 km |
| Relative speed | 14.873 km/s |
| Angle between velocity vectors | 166° |
| Geographic position | 56.6°S, 99.7°W |
| Height | 703 km |
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