| Primary satellite | Secondary satellite |
| Name | PRISM | COSMOS 2251 DEB |
| Spacetrack catalog number | 33493 | 35782 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2021 Mar 08 02:28 | 2021 Mar 04 07:04 |
| Time of closest approach (UTC) | 2021 Jan 23 10:19:57.390 |
| Minimum distance | 105.417 km |
| Height difference | -5.387 km |
| Relative speed | 15.111 km/s |
| Angle between velocity vectors | 172° |
| Geographic position | 22.3°N, 115.4°W |
| Height | 581 km |
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