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| Specification | Castor IVA | Castor 120 |
|---|---|---|
| Application | Atlas, Conestoga strap-on | Athena booster |
| Propellant | Class 1.3 Hydroxl-terminated polybutadiene (HTPB-a polymer) | |
| Max Thrust | 435,000 lb | |
| Avg thrust | 371,000 lb | |
| Weight | 116,275 lb | |
| Mass fraction | 0.924 | |
| Total impulse | 29,900,000 lbf-s | |
| Specific Impulse | 280 s | |
| Burn time | 81 s |