| Primary satellite | Secondary satellite |
| Name | OPAL | Cosmos 1503 |
| Spacetrack catalog number | 26063 | 14401 |
| Radar cross section | medium | large |
| Epoch of two-line elements (UTC) | 2021 Mar 05 17:26 | 2021 Mar 05 09:18 |
| Time of closest approach (UTC) | 2021 Jan 23 23:37:20.486 |
| Minimum distance | 7.103 km |
| Height difference | 2.547 km |
| Relative speed | 14.868 km/s |
| Angle between velocity vectors | 174° |
| Geographic position | 20.4°S, 176.9°E |
| Height | 798 km |
|