| Primary satellite | Secondary satellite |
| Name | Cosmos 1500 Rocket | deb Transtage 4 |
| Spacetrack catalog number | 14373 | 1829 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 21 04:01 | 2021 Apr 20 16:34 |
| Time of closest approach (UTC) | 2021 Mar 08 18:42:37.178 |
| Minimum distance | 18.742 km |
| Height difference | -3.170 km |
| Relative speed | 10.255 km/s |
| Angle between velocity vectors | 86° |
| Geographic position | 32.3°S, 39.2°W |
| Height | 629 km |
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