| Primary satellite | Secondary satellite |
| Name | Cosmos 2278 | IRAS Rocket |
| Spacetrack catalog number | 23087 | 13778 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Mar 04 09:40 | 2021 Mar 04 16:33 |
| Time of closest approach (UTC) | 2021 Jan 23 14:49:45.893 |
| Minimum distance | 160.475 km |
| Height difference | -0.955 km |
| Relative speed | 7.342 km/s |
| Angle between velocity vectors | 59° |
| Geographic position | 59.9°S, 2.1°W |
| Height | 872 km |
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