| Primary satellite | Secondary satellite |
| Name | SL-16 R/B | Cosmos 1275 Rocket |
| Spacetrack catalog number | 28353 | 13807 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 14 05:40 | 2021 Apr 14 10:32 |
| Time of closest approach (UTC) | 2021 Mar 06 19:21:39.250 |
| Minimum distance | 83.111 km |
| Height difference | -6.639 km |
| Relative speed | 3.043 km/s |
| Angle between velocity vectors | 24° |
| Geographic position | 56.8°S, 134.5°W |
| Height | 864 km |
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