| Primary satellite | Secondary satellite |
| Name | SL-4 R/B | COSMOS 1408 DEB |
| Spacetrack catalog number | 39679 | 50926 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2023 Sep 25 11:31 | 2023 Sep 25 10:45 |
| Time of closest approach (UTC) | 2023 Jun 02 11:31:02.135 |
| Minimum distance | 3526.287 km |
| Height difference | 418.809 km |
| Relative speed | 14.226 km/s |
| Angle between velocity vectors | 143° |
| Geographic position | 42.5°N, 167.8°W |
| Height | 431 km |
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