| Primary satellite | Secondary satellite |
| Name | PRISM | COSMOS 2251 DEB |
| Spacetrack catalog number | 33493 | 35673 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2021 Mar 05 18:21 | 2021 Mar 05 06:27 |
| Time of closest approach (UTC) | 2021 Jan 18 06:09:50.239 |
| Minimum distance | 77.048 km |
| Height difference | 6.180 km |
| Relative speed | 15.114 km/s |
| Angle between velocity vectors | 172° |
| Geographic position | 8.0°N, 122.3°E |
| Height | 572 km |
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