Tridecimal eighth-octave comma

Interval information

Ratio	17303/17280
Factorization	2-7 × 3-3 × 5-1 × 113 × 13
Monzo	[-7 -3 -1 0 3 1⟩
Size in cents	2.302772¢
Name	Shelly
Color name	3o1o3g1 thotrilo-agu unison
FJS name	[math]\displaystyle{ \text{dd1}^{11,11,11,13}_{5} }[/math]
Special properties	reduced
Tenney norm (log2 nd)	28.1556
Weil norm (log2 max(n, d))	28.1575
Wilson norm (sopfr(nd))	74
Comma size	unnoticeable
S-expression	S11/S12
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17303/17280 is an unnoticable comma that is the difference between three 12/11 neutral seconds and a 13/10 supermajor third. It is tempered out in low EDOs that are a multiple of 8, along with 214990848/214358881 and 815830271/800000000, defining various 8th-octave temperaments. However, that's not all, as it is also tempered out in EDOs such as 159edo.

Previously known, but unnamed, Budjarn Lambeth named it the shelly comma in 2024, after asteroid 17280 Shelly.