| Primary satellite | Secondary satellite |
| Name | deb Kosmos-1275 | deb Delta 139 |
| Spacetrack catalog number | 12703 | 12256 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2024 Dec 22 17:13 | 2024 Dec 22 14:07 |
| Time of closest approach (UTC) | 2024 Dec 24 14:46:08.506 |
| Minimum distance | 2.487 km |
| Height difference | 1.835 km |
| Relative speed | 13.692 km/s |
| Angle between velocity vectors | 136° |
| Geographic position | 80.9°S, 174.7°E |
| Height | 896 km |
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