487edo: Difference between revisions

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Expansion
+RTT table and rank-2 temperaments
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== Theory ==
== Theory ==
487et tempers out {{monzo| 24 -21 4 }} ([[vulture comma]]) and {{monzo| 55 -1 -23 }} in the 5-limit, [[4375/4374]], [[235298/234375]], [[28824005/28697814]], and [[33554432/33480783]] in the 7-limit, [[5632/5625]], [[19712/19683]], [[41503/41472]] in the 11-limit, [[676/675]], [[1001/1000]], [[2080/2079]], [[4096/4095]], and [[4225/4224]] in the 13-limit. It supports [[semidimfourth]], [[seniority]], and [[vulture]].  
487et tempers out {{monzo| 24 -21 4 }} ([[vulture comma]]) and {{monzo| 55 -1 -23 }} in the 5-limit, 4375/4374 ([[ragisma]]), 235298/234375 ([[triwellisma]]), and 33554432/33480783 ([[garischisma]]) in the 7-limit, [[5632/5625]], [[12005/11979]], [[19712/19683]], [[41503/41472]] in the 11-limit, [[676/675]], [[1001/1000]], [[2080/2079]], [[4096/4095]], and [[4225/4224]] in the 13-limit. It supports [[semidimfourth]], [[seniority]], and [[vulture]].  


=== Prime harmonics ===
=== Prime harmonics ===
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=== Miscellaneous properties ===
=== Miscellaneous properties ===
487edo is the 93rd [[prime edo]].  
487edo is the 93rd [[prime edo]].  
== Regular temperament properties ==
{| class="wikitable center-4 center-5 center-6"
! rowspan="2" | [[Subgroup]]
! rowspan="2" | [[Comma list|Comma List]]
! rowspan="2" | [[Mapping]]
! rowspan="2" | Optimal<br>8ve Stretch (¢)
! colspan="2" | Tuning Error
|-
! [[TE error|Absolute]] (¢)
! [[TE simple badness|Relative]] (%)
|-
| 2.3
| {{monzo| 772 -487 }}
| [{{val| 487 772 }}]
| -0.0958
| 0.0958
| 3.89
|-
| 2.3.5
| {{monzo| 24 -21 4 }}, {{monzo| 55 -1 -23 }}
| [{{val| 487 772 1131 }}]
| -0.1421
| 0.1020
| 4.14
|-
| 2.3.5.7
| 4375/4374, 235298/234375, 33554432/33480783
| [{{val| 487 772 1131 1367 }}]
| -0.0667
| 0.1577
| 6.40
|-
| 2.3.5.7.11
| 4375/4374, 5632/5625, 12005/11979, 41503/41472
| [{{val| 487 772 1131 1367 1685 }}]
| -0.0899
| 0.1485
| 6.03
|-
| 2.3.5.7.11.13
| 676/675, 1001/1000, 4096/4095, 4375/4374, 12005/11979
| [{{val| 487 772 1131 1367 1685 1802 }}]
| -0.0623
| 0.1490
| 6.05
|}
=== Rank-2 temperaments ===
{| class="wikitable center-all left-5"
|+Table of rank-2 temperaments by generator
! Periods<br>per 8ve
! Generator<br>(Reduced)
! Cents<br>(Reduced)
! Associated<br>Ratio
! Temperaments
|-
| 1
| 131\487
| 322.79
| 3087/2560
| [[Seniority]]
|-
| 1
| 182\487
| 448.46
| 35/27
| [[Semidimfourth]]
|-
| 1
| 193\487
| 475.56
| 320/243
| [[Vulture]]
|-
| 1
| 202\487
| 497.74
| 4/3
| [[Gary]]
|-
| 1
| 227\487
| 559.34
| 864/625
| [[Tritriple]] (5-limit)
|}


== Scales ==
== Scales ==

Revision as of 13:40, 31 October 2022

← 486edo 487edo 488edo →
Prime factorization 487 (prime)
Step size 2.46407 ¢ 
Fifth 285\487 (702.259 ¢)
Semitones (A1:m2) 47:36 (115.8 ¢ : 88.71 ¢)
Consistency limit 13
Distinct consistency limit 13

Template:EDO intro

Theory

487et tempers out [24 -21 4 (vulture comma) and [55 -1 -23 in the 5-limit, 4375/4374 (ragisma), 235298/234375 (triwellisma), and 33554432/33480783 (garischisma) in the 7-limit, 5632/5625, 12005/11979, 19712/19683, 41503/41472 in the 11-limit, 676/675, 1001/1000, 2080/2079, 4096/4095, and 4225/4224 in the 13-limit. It supports semidimfourth, seniority, and vulture.

Prime harmonics

Approximation of prime harmonics in 487edo
Harmonic 2 3 5 7 11 13 17 19 23 29 31
Error Absolute (¢) +0.00 +0.30 +0.54 -0.45 +0.63 -0.28 +1.00 +0.64 +0.06 +0.40 +0.75
Relative (%) +0.0 +12.3 +22.1 -18.2 +25.7 -11.4 +40.6 +25.9 +2.5 +16.3 +30.6
Steps
(reduced)
487
(0)
772
(285)
1131
(157)
1367
(393)
1685
(224)
1802
(341)
1991
(43)
2069
(121)
2203
(255)
2366
(418)
2413
(465)

Miscellaneous properties

487edo is the 93rd prime edo.

Regular temperament properties

Subgroup Comma List Mapping Optimal
8ve Stretch (¢)
Tuning Error
Absolute (¢) Relative (%)
2.3 [772 -487 [487 772]] -0.0958 0.0958 3.89
2.3.5 [24 -21 4, [55 -1 -23 [487 772 1131]] -0.1421 0.1020 4.14
2.3.5.7 4375/4374, 235298/234375, 33554432/33480783 [487 772 1131 1367]] -0.0667 0.1577 6.40
2.3.5.7.11 4375/4374, 5632/5625, 12005/11979, 41503/41472 [487 772 1131 1367 1685]] -0.0899 0.1485 6.03
2.3.5.7.11.13 676/675, 1001/1000, 4096/4095, 4375/4374, 12005/11979 [487 772 1131 1367 1685 1802]] -0.0623 0.1490 6.05

Rank-2 temperaments

Table of rank-2 temperaments by generator
Periods
per 8ve
Generator
(Reduced)
Cents
(Reduced)
Associated
Ratio
Temperaments
1 131\487 322.79 3087/2560 Seniority
1 182\487 448.46 35/27 Semidimfourth
1 193\487 475.56 320/243 Vulture
1 202\487 497.74 4/3 Gary
1 227\487 559.34 864/625 Tritriple (5-limit)

Scales