| Official name | SL-4 R/B |
| Alternative name | Blok-I (Soyuz-U) |
| Cospar ID | 1990-098B |
| Norad ID | 20937 |
| Launch date | 1990-11-16 |
| Launch site | PKMTR |
| Launch vehicle | Soyuz-U |
| RCS size | UNKNOWN |
| Decay date | 1990-12-05 |
| Shape | Cyl |
| Mass (kg) | 2378.59 |
| Diameter (m) | 2.66 |
| Height (m) | 6.7 |
| Span (m^2) | 6.7 |






