| Primary satellite | Secondary satellite |
| Name | IRS-1C Rocket | Rex-II |
| Spacetrack catalog number | 23753 | 23814 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2021 Apr 16 15:42 | 2021 Apr 16 13:59 |
| Time of closest approach (UTC) | 2021 Mar 03 23:28:26.569 |
| Minimum distance | 8.497 km |
| Height difference | 5.592 km |
| Relative speed | 12.662 km/s |
| Angle between velocity vectors | 116° |
| Geographic position | 80.0°N, 177.8°E |
| Height | 819 km |
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