| CODATA | calculated |
| mp = 1.67262192369 (51) × 10−27 kg | 1.6726219236843 × 10−27 kg |
| λcP = 1.32140985539 (40) × 10−15 m | 1.3214098553898 × 10−15 m |
| rP = 8.414 (19) × 10−16 m§ | rCP = 1.5346982671867 × 10−18 m |
| EP = 1.50327761598 (46) × 10−10 J | Entry Parameter |
| µN = 5.0507837461 (15) × 10−27 J/T# | 5.0507837461136 × 10−27 J/T |
| Jzτ = missing | 7.3979796330019 × 10−59 kg∙m2 |