| Primary satellite | Secondary satellite |
| Name | Cosmos 158 Rocket | Cosmos 1503 |
| Spacetrack catalog number | 2802 | 14401 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Apr 22 08:11 | 2021 Apr 22 12:19 |
| Time of closest approach (UTC) | 2021 Mar 04 17:05:23.978 |
| Minimum distance | 6.242 km |
| Height difference | 0.479 km |
| Relative speed | 12.691 km/s |
| Angle between velocity vectors | 117° |
| Geographic position | 58.4°N, 129.7°E |
| Height | 802 km |
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