Electra

Electra is a tritave-based rank-2 temperament in the 3.5.11.13 subgroup, with a generator near 15/11 or it's tritave complement 11/5. The name was given by CompactStar in analogy to the Sirius, Arcturus, and Canopus star names used for other tritave temperaments. It tempers out the commas 1875/1859 and 14641/14625, with the latter being the amount by which 3 11/5's exceed 117/11. It possesses MOS scales of the families 4L 3s<3/1>, 7L 4s<3/1>, and 7L 11s<3/1>.

Intervals

In 7-note MOS

Here, "major" quality is used for intervals in the mode 5|1 and "minor" quality is used for intervals in the mode 1|5.

Interval name	Cents (18edt)
Perfect unison	0.000
Diminished mosstep	0.000
Minor mosstep	211.328
Major mosstep	316.993
Augmented mosstep	422.657
Diminshed 2-mosstep	422.657
Perfect 2-mosstep	528.321
Augmented 2-mosstep	633.985
Diminished 3-mosstep	633.985
Minor 3-mosstep	739.649
Major 3-mosstep	845.313
Augmented 3-mosstep	950.978
Diminished 4-mosstep	950.978
Minor 4-mosstep	1056.642
Major 4-mosstep	1162.306
Augmented 4-mosstep	1267.970
Diminished 5-mosstep	1267.970
Perfect 5-mosstep	1373.634

Chords

The 11:13:15 triad is a characteristic feature of many Electra scales, and has been suggeested by CompactStar as a fundamental sonority for no-2's music, due to being relatively consonant compared to other no-2's chords. There is als a "minor" version of this triad, 143:165:195.