| Primary satellite | Secondary satellite |
| Name | Vanguard 1 | DELTA 1 DEB |
| Spacetrack catalog number | 5 | 27728 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2021 Jan 16 09:33 | 2021 Jan 15 22:17 |
| Time of closest approach (UTC) | 2020 Dec 10 22:41:18.862 |
| Minimum distance | 73.835 km |
| Height difference | -14.091 km |
| Relative speed | 13.396 km/s |
| Angle between velocity vectors | 135° |
| Geographic position | 5.4°S, 23.8°W |
| Height | 1593 km |
|