| Primary satellite | Secondary satellite |
| Name | Cosmos 1515 Rocket | IRIDIUM 33 DEB |
| Spacetrack catalog number | 14552 | 35739 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 16 13:18 | 2021 Apr 15 13:41 |
| Time of closest approach (UTC) | 2021 Mar 06 10:40:38.837 |
| Minimum distance | 2.277 km |
| Height difference | 1.535 km |
| Relative speed | 15.025 km/s |
| Angle between velocity vectors | 169° |
| Geographic position | 0.3°S, 100.4°E |
| Height | 633 km |
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