| Primary satellite | Secondary satellite |
| Name | DELTA 1 DEB | Cosmos 1503 |
| Spacetrack catalog number | 37651 | 14401 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2025 Nov 12 00:36 | 2025 Nov 13 13:03 |
| Time of closest approach (UTC) | 2025 Oct 16 13:27:55.241 |
| Minimum distance | 1.911 km |
| Height difference | 0.176 km |
| Relative speed | 14.863 km/s |
| Angle between velocity vectors | 168° |
| Geographic position | 53.5°N, 6.1°W |
| Height | 782 km |
|