| Primary satellite | Secondary satellite |
| Name | Cosmos 1898 Rocket | COSMOS 1275 DEB |
| Spacetrack catalog number | 18586 | 42157 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 10 19:42 | 2021 Apr 09 07:29 |
| Time of closest approach (UTC) | 2021 Mar 06 22:10:39.218 |
| Minimum distance | 4.360 km |
| Height difference | 2.584 km |
| Relative speed | 7.984 km/s |
| Angle between velocity vectors | 65° |
| Geographic position | 74.1°S, 84.8°E |
| Height | 806 km |
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