RS4S - Norad ID: 53321
| Spacetrack Directory Name | YUZGU 10 |
| Alternative name | RS4S |
| Orbit launches |
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| Deorbitation date |
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| Days in orbit | 8834 |
| Country/organisation of origin | Commonwealth of Independent States (former USSR) (CIS) |
| Starting point | TYMSC (Baikonur Cosmodrome, Kazakhstan) |
| Perigee | 410 km |
| Apogee | 415 km |
Achieve autonomous grouping of satellites in space and measure density of vacuum.