| Primary satellite | Secondary satellite |
| Name | Cosmos 1515 Rocket | TURKSAT 3U |
| Spacetrack catalog number | 14552 | 39152 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2021 Apr 18 12:14 | 2021 Apr 18 04:17 |
| Time of closest approach (UTC) | 2021 Mar 06 09:29:55.474 |
| Minimum distance | 12.254 km |
| Height difference | 0.041 km |
| Relative speed | 10.660 km/s |
| Angle between velocity vectors | 90° |
| Geographic position | 79.2°S, 105.1°W |
| Height | 644 km |
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