| Primary satellite | Secondary satellite |
| Name | IRS-1C Rocket | IRIDIUM 33 DEB |
| Spacetrack catalog number | 23753 | 34497 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 16 15:42 | 2021 Apr 16 07:42 |
| Time of closest approach (UTC) | 2021 Mar 02 14:27:01.270 |
| Minimum distance | 14.006 km |
| Height difference | -4.447 km |
| Relative speed | 2.622 km/s |
| Angle between velocity vectors | 20° |
| Geographic position | 51.2°S, 120.7°W |
| Height | 821 km |
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