129/128
| Interval information |
43rd-partial chroma,
43-limit Johnston comma
reduced,
reduced harmonic
129/128, the Magikarp comma is a 2.3.43 subgroup comma. It is the amount by which the octave-reduced 43rd harmonic 43/32 exceeds the perfect fourth (4/3).
This interval is the 43rd-partial chroma (43-limit formal comma) used to express 43-limit intervals in the Functional Just System and Helmholtz-Ellis notation, as well as extended Ben Johnston's notation. It is significant to translate a Pythagorean interval to a nearby quadragesimotertial interval.
Etymology
The name Magikarp comma was named by Xenllium in 2025. It refers to Magikarp (National Pokédex number #0129), which was in turn named after a fictional character in the Pokémon franchise (Pokémon species). Before that, this interval was known as 43rd-partial chroma or 43-limit Johnston comma.
Temperaments
Tempering out this comma in the 43-limit leads to the magikarp temperament. In the 2.3.43 subgroup, it can be viewed as a diatonic-based temperament in which the perfect fifth represents both 3/2 and 64/43 (43rd subharmonic).