| Primary satellite | Secondary satellite |
| Name | Vanguard 2 Rocket | COSMOS 1275 DEB |
| Spacetrack catalog number | 12 | 39943 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2025 Dec 15 18:25 | 2025 Dec 15 09:49 |
| Time of closest approach (UTC) | 2024 Nov 13 21:52:16.483 |
| Minimum distance | 8612.155 km |
| Height difference | -2209.216 km |
| Relative speed | 12.690 km/s |
| Angle between velocity vectors | 148° |
| Geographic position | 32.7°N, 168.5°E |
| Height | 3261 km |
|