| Primary satellite | Secondary satellite |
| Name | Cosmos 1356 | Cosmos 803 |
| Spacetrack catalog number | 13153 | 8688 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Apr 13 03:26 | 2021 Apr 13 01:50 |
| Time of closest approach (UTC) | 2021 Mar 05 12:17:56.637 |
| Minimum distance | 229.507 km |
| Height difference | 1.497 km |
| Relative speed | 9.237 km/s |
| Angle between velocity vectors | 74° |
| Geographic position | 66.9°S, 30.7°E |
| Height | 469 km |
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