| Primary satellite | Secondary satellite |
| Name | Transit 4A | Cosmos 1627 Rocket |
| Spacetrack catalog number | 116 | 15506 |
| Radar cross section | medium | large |
| Epoch of two-line elements (UTC) | 2026 Jan 15 02:37 | 2026 Jan 15 10:01 |
| Time of closest approach (UTC) | 2025 Dec 17 21:53:00.859 |
| Minimum distance | 8.170 km |
| Height difference | -5.573 km |
| Relative speed | 14.215 km/s |
| Angle between velocity vectors | 149° |
| Geographic position | 10.6°N, 94.8°E |
| Height | 958 km |
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