| Primary satellite | Secondary satellite |
| Name | Transit 2A Rocket | COSMOS 1603 DEB |
| Spacetrack catalog number | 47 | 43312 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Mar 07 13:08 | 2021 Mar 07 20:35 |
| Time of closest approach (UTC) | 2021 Jan 31 08:47:17.515 |
| Minimum distance | 79.936 km |
| Height difference | 0.283 km |
| Relative speed | 8.023 km/s |
| Angle between velocity vectors | 66° |
| Geographic position | 64.6°S, 112.7°W |
| Height | 856 km |
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