| Primary satellite | Secondary satellite |
| Name | Cosmos 1937 Rocket | IRIDIUM 166 |
| Spacetrack catalog number | 19039 | 43570 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Apr 10 09:51 | 2021 Apr 09 19:12 |
| Time of closest approach (UTC) | 2021 Mar 03 18:54:25.664 |
| Minimum distance | 14.876 km |
| Height difference | -1.586 km |
| Relative speed | 14.704 km/s |
| Angle between velocity vectors | 160° |
| Geographic position | 2.9°N, 121.7°W |
| Height | 781 km |
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