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Interval information
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 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{n\cdot d}[/math])
~3.08813 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 43-limit (prefix???) interval.