| Primary satellite | Secondary satellite |
| Name | STARS | COSMOS 2251 DEB |
| Spacetrack catalog number | 33498 | 40794 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2026 Jan 19 15:31 | 2026 Jan 16 11:02 |
| Time of closest approach (UTC) | 2025 Dec 19 16:18:00.258 |
| Minimum distance | 356.082 km |
| Height difference | -15.245 km |
| Relative speed | 15.092 km/s |
| Angle between velocity vectors | 173° |
| Geographic position | 29.4°S, 131.5°E |
| Height | 602 km |
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