| Primary satellite | Secondary satellite |
| Name | OBJECT D | STARLINK-6121 |
| Spacetrack catalog number | 52156 | 56129 |
| Radar cross section | medium | large |
| Epoch of two-line elements (UTC) | 2024 Dec 23 04:08 | 2024 Dec 23 03:44 |
| Time of closest approach (UTC) | 2024 Dec 24 07:29:11.767 |
| Minimum distance | 4.597 km |
| Height difference | -4.447 km |
| Relative speed | 10.512 km/s |
| Angle between velocity vectors | 88° |
| Geographic position | 41.7°N, 166.9°W |
| Height | 567 km |
|