| Primary satellite | Secondary satellite |
| Name | Helios 1A Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 23608 | 33813 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 May 16 12:14 | 2025 May 16 01:18 |
| Time of closest approach (UTC) | 2025 Apr 28 15:15:00.562 |
| Minimum distance | 370.533 km |
| Height difference | 0.006 km |
| Relative speed | 13.190 km/s |
| Angle between velocity vectors | 120° |
| Geographic position | 71.4°S, 142.0°W |
| Height | 511 km |
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