| Official name | SL-8 DEB |
| Alternative name | Cosmos-3M fragmentation debris |
| Cospar ID | 1991-009W |
| Norad ID | 21159 |
| Launch date | 1991-02-12 |
| Launch site | PKMTR |
| Launch vehicle | Kosmos-3M |
| RCS size | SMALL |
| Decay date | ON ORBIT |
| Period (min) | 117.16 |
| Inclination (deg) | 73.94 |
| Perigee (km) | 1439 |
| Apogee (km) | 1667 |
| Eccentricity | 0.0734063103670315 |
| Mean motion (revs. per day) | 12.2908842608399 |
| Semi-Major axis (km) | 7931.135 |
| Raan (deg) | 39.6684 |
| Arg of perigee (deg) | 64.9113 |
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