| Primary satellite | Secondary satellite |
| Name | ADEOS Rocket | COSMOS 1249 COOLANT |
| Spacetrack catalog number | 24279 | 26911 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 11 21:46 | 2021 Apr 10 16:26 |
| Time of closest approach (UTC) | 2021 Mar 05 00:43:10.380 |
| Minimum distance | 6.271 km |
| Height difference | 1.681 km |
| Relative speed | 12.778 km/s |
| Angle between velocity vectors | 119° |
| Geographic position | 64.8°N, 116.7°W |
| Height | 934 km |
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