| Official name | IUS R/B(1) |
| Alternative name | IUS first stage (Atlantis (OV-104)) |
| Cospar ID | 1991-080C |
| Norad ID | 21806 |
| Launch date | 1991-11-24 |
| Launch site | AFETR |
| Launch vehicle | Shuttle |
| RCS size | LARGE |
| Decay date | ON ORBIT |
| Period (min) | 604.97 |
| Inclination (deg) | 26.55 |
| Perigee (km) | 408 |
| Apogee (km) | 34225 |
| Eccentricity | 0.976438656772442 |
| Mean motion (revs. per day) | 2.38028331983404 |
| Semi-Major axis (km) | 23694.635 |
| Raan (deg) | 138.4953 |
| Arg of perigee (deg) | 173.3443 |
| Shape | Cyl |
| Mass (kg) | 1243.81 |
| Diameter (m) | 2.32 |
| Height (m) | 3.07 |
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