| Primary satellite | Secondary satellite |
| Name | Cosmos 2150 Rocket | TRANSIT 15 DEB |
| Spacetrack catalog number | 21419 | 29265 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 20 04:34 | 2021 Jan 19 20:08 |
| Time of closest approach (UTC) | 2020 Dec 08 20:31:30.990 |
| Minimum distance | 148.215 km |
| Height difference | -3.951 km |
| Relative speed | 14.616 km/s |
| Angle between velocity vectors | 155° |
| Geographic position | 53.2°N, 131.6°E |
| Height | 770 km |
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