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Interval information
Ratio 245/242
Factorization 2-1 × 5 × 72 × 11-2
Monzo [-1 0 1 2 -2
Size in cents 21.329642¢
Name frostma
Color name luuzzy2, luluzozoyo 2nd
FJS name [math]\text{M2}^{5,7,7}_{11,11}[/math]
Special properties reduced
Tenney height (log2 nd) 15.8555
Weil height (log2 max(n, d)) 15.8733
Wilson height (sopfr (nd)) 43
Harmonic entropy
(Shannon, [math]\sqrt{n\cdot d}[/math])
~3.80589 bits
Comma size small
open this interval in xen-calc

The frostma (ratio: 245/242, monzo: [-1 0 1 2 -2) is a small 11-limit comma named after Frostburn used in the construction of the frostburn temperament.

It can be factored into (243/242)(245/243).

When tempered out, it equates a stack of two 11/7s with a 5/2 major tenth.


Before the comma got the name frostma, it was known as the cassacot, probably derived from cassandra and tetracot. However, cassandra was a misnomer for andromeda. The temperament's name was later corrected. Since then, cassacot has lost its root, thus justifying the new name.


"245/242 should be the frostma because 243/242 is the rastma…"Praveen Venkataramana

See also