| Primary satellite | Secondary satellite |
| Name | deb Delta 139 | COSMOS 2251 DEB |
| Spacetrack catalog number | 12172 | 34022 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2024 Dec 22 00:38 | 2024 Dec 23 00:37 |
| Time of closest approach (UTC) | 2024 Dec 27 03:23:01.268 |
| Minimum distance | 4.396 km |
| Height difference | 4.188 km |
| Relative speed | 14.897 km/s |
| Angle between velocity vectors | 172° |
| Geographic position | 25.1°S, 122.7°W |
| Height | 782 km |
|