| Primary satellite | Secondary satellite |
| Name | STARS | COSMOS 2251 DEB |
| Spacetrack catalog number | 33498 | 35461 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2023 May 29 04:05 | 2023 Apr 19 07:26 |
| Time of closest approach (UTC) | 2023 Mar 28 04:52:22.055 |
| Minimum distance | 3351.693 km |
| Height difference | -4.656 km |
| Relative speed | 5.889 km/s |
| Angle between velocity vectors | 46° |
| Geographic position | 61.2°N, 74.7°W |
| Height | 632 km |
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