| Primary satellite | Secondary satellite |
| Name | NEE 01 PEGASUS | Cosmos 2221 |
| Spacetrack catalog number | 39151 | 22236 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2021 Feb 25 18:14 | 2021 Feb 25 21:07 |
| Time of closest approach (UTC) | 2021 Jan 28 01:11:26.302 |
| Minimum distance | 7.992 km |
| Height difference | -1.475 km |
| Relative speed | 13.118 km/s |
| Angle between velocity vectors | 121° |
| Geographic position | 81.1°N, 131.2°W |
| Height | 630 km |
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