| Primary satellite | Secondary satellite |
| Name | SL-19 R/B | ALSAT 1B |
| Spacetrack catalog number | 37363 | 41785 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2021 Mar 07 18:52 | 2021 Mar 07 20:45 |
| Time of closest approach (UTC) | 2021 Jan 22 03:57:22.049 |
| Minimum distance | 984.414 km |
| Height difference | 12.252 km |
| Relative speed | 6.343 km/s |
| Angle between velocity vectors | 50° |
| Geographic position | 80.4°N, 104.6°E |
| Height | 691 km |
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