| Primary satellite | Secondary satellite |
| Name | IRS-1C Rocket | IRIDIUM 33 DEB |
| Spacetrack catalog number | 23753 | 37560 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 12 12:23 | 2021 Apr 11 17:51 |
| Time of closest approach (UTC) | 2021 Mar 08 19:48:00.206 |
| Minimum distance | 119.934 km |
| Height difference | 4.583 km |
| Relative speed | 2.370 km/s |
| Angle between velocity vectors | 18° |
| Geographic position | 46.2°N, 179.9°E |
| Height | 812 km |
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