| Primary satellite | Secondary satellite |
| Name | Courier 1B | NNS O-23 |
| Spacetrack catalog number | 58 | 19070 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Feb 25 11:57 | 2021 Feb 25 11:00 |
| Time of closest approach (UTC) | 2021 Feb 02 06:40:48.997 |
| Minimum distance | 4.923 km |
| Height difference | 0.569 km |
| Relative speed | 8.512 km/s |
| Angle between velocity vectors | 72° |
| Geographic position | 22.0°S, 87.4°E |
| Height | 1177 km |
|