| Primary satellite | Secondary satellite |
| Name | Cosmos 1603 | NOAA 16 DEB |
| Spacetrack catalog number | 15333 | 41500 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 11 21:10 | 2021 Apr 11 19:18 |
| Time of closest approach (UTC) | 2021 Mar 07 10:08:07.436 |
| Minimum distance | 4.116 km |
| Height difference | 1.042 km |
| Relative speed | 8.750 km/s |
| Angle between velocity vectors | 72° |
| Geographic position | 65.2°S, 36.4°E |
| Height | 859 km |
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