129/128
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| Ratio | 129/128 |
| Subgroup monzo | 2.3.43 [-7 1 1⟩ |
| Size in cents | 13.472707¢ |
| Name | 43-limit comma (HEJI) |
| Color name | 43o1, fotho unison |
| FJS name | [math]\text{P1}^{43}[/math] |
| Special properties | superparticular, reduced, reduced harmonic |
| Tenney height (log2 nd) | 14.0112 |
| Weil height (log2 max(n, d)) | 14.0225 |
| Wilson height (sopfr(nd)) | 60 |
| Harmonic entropy (Shannon, [math]\sqrt{nd}[/math]) |
~2.68981 bits |
| Comma size | small |
| open this interval in xen-calc | |
129/128, or the 43-limit Johnston comma (HEJI), is a 2.3.43 subgroup comma. It is the amount by which 43/32 (the 43rd harmonic) exceeds the perfect fourth (4/3). It is significant in Helmholtz-Ellis notation as the formal comma to translate a Pythagorean interval to a nearby quadragesimotertial interval.