Period length over time for Mira stars

These period diagrams is based on the O-C diagrams at http://var.saaf.se/mirainfooc.php and calculated with data from AAVSO, AFOEV, VSOLJ, BAAVSS, ASAS-SN and DASCH and various published maxima. The diagrams shows the development over time of the stars mean period or cycle length.
The difference between the mean period and the period at a certain time can be calculated as the slope of an O-C diagram at that time. To get the O-C diagram more smooth and thus the period less jumpy a moving average O-C for each cycle was first calculated. The moving average is the mean of the O-C for the current cycle together with 3 O-C values before and after the current.
The period for cycle i was then calculated as: Mean period + (avg O-Ci+1 - avg O-Ci-1) / 2.

Each diagram is also clickable to get a table with the underlying data.

Constellations
And - CMi
Cap - Cyg
Del - Hyi
Ind - Ori
Pav - Vul

Indus
R Ind
Mean period: 216.48, Mean epoch: 2441803.3
GCVS period: 216.26, GCVS epoch: 2441801
GCVS spectral type: M2e-M4(II)e


 S Ind
Mean period: 400.26, Mean epoch: 2439794.0
GCVS period: 399.95, GCVS epoch: 2439779
GCVS spectral type: M6e-M8eII-Ib:
Lacerta
R Lac
Mean period: 300.36, Mean epoch: 2441555.0
GCVS period: 299.86, GCVS epoch: 2441526
GCVS spectral type: M5e-M8.5e


 S Lac
Mean period: 240.07, Mean epoch: 2443815.9
GCVS period: 241.5, GCVS epoch: 2443804
GCVS spectral type: M4e-M8.2e
Leo
R Leo
Mean period: 312.42, Mean epoch: 2444191.6
GCVS period: 309.95, GCVS epoch: 2444164
GCVS spectral type: M6e-M8IIIe-M9.5e


 S Leo
Mean period: 189.57, Mean epoch: 2443581.6
GCVS period: 190.16, GCVS epoch: 2443591
GCVS spectral type: M3e-M6e:


 V Leo
Mean period: 273.40, Mean epoch: 2442706.0
GCVS period: 273.35, GCVS epoch: 2442706
GCVS spectral type: M5e
W Leo
Mean period: 387.17, Mean epoch: 2443622.5
GCVS period: 391.75, GCVS epoch: 2443627
GCVS spectral type: M5.5e-M7e


 RS Leo
Mean period: 208.04, Mean epoch: 2444998.6
GCVS period: 208.2, GCVS epoch: 2445020
GCVS spectral type: M5e
Leo Minor
R LMi
Mean period: 372.74, Mean epoch: 2445126.2
GCVS period: 372.19, GCVS epoch: 2445094
GCVS spectral type: M6.5e-M9.0e(Tc:)


 S LMi
Mean period: 233.59, Mean epoch: 2445288.1
GCVS period: 233.83, GCVS epoch: 2445292
GCVS spectral type: M2.0e-M8.2e
Lepus
R Lep
Mean period: 433.16, Mean epoch: 2442564.7
GCVS period: 427.07, GCVS epoch: 2442506
GCVS spectral type: C7,6e(N6e)


 T Lep
Mean period: 369.00, Mean epoch: 2441888.9
GCVS period: 368.13, GCVS epoch: 2441844
GCVS spectral type: M6e-M9e


 X Lep
Mean period: 277.60, Mean epoch: 2438694.8
GCVS period: 278.81, GCVS epoch: 2438744
GCVS spectral type: M7e
Libra
R Lib
Mean period: 242.05, Mean epoch: 2439245.5
GCVS period: 241.85, GCVS epoch: 2439221
GCVS spectral type: M5e


 S Lib
Mean period: 193.08, Mean epoch: 2441928.5
GCVS period: 192.9, GCVS epoch: 2441883
GCVS spectral type: M1.0e-M6.0e


 T Lib
Mean period: 237.85, Mean epoch: 2438490.8
GCVS period: 237.5, GCVS epoch: 2438474
GCVS spectral type: M4e-M5.5e
U Lib
Mean period: 227.06, Mean epoch: 2439139.6
GCVS period: 226.59, GCVS epoch: 2439124
GCVS spectral type: M3e-M8.0e


 V Lib
Mean period: 255.63, Mean epoch: 2439230.9
GCVS period: 255.3, GCVS epoch: 2439214
GCVS spectral type: M5e-M8.0e


 W Lib
Mean period: 203.93, Mean epoch: 2438949.2
GCVS period: 205.5, GCVS epoch: 2438945
GCVS spectral type:


X Lib
Mean period: 164.57, Mean epoch: 2438452.4
GCVS period: 164.38, GCVS epoch: 2438470
GCVS spectral type: M4e


 Y Lib
Mean period: 275.84, Mean epoch: 2444035.6
GCVS period: 275.7, GCVS epoch: 2444017
GCVS spectral type: M5e-M8.2e


 RR Lib
Mean period: 277.45, Mean epoch: 2438795.0
GCVS period: 277.01, GCVS epoch: 2438784
GCVS spectral type: M4e-M8e
RS Lib
Mean period: 218.05, Mean epoch: 2442151.0
GCVS period: 217.65, GCVS epoch: 2442154
GCVS spectral type: M7e-M8.5e


 RT Lib
Mean period: 251.44, Mean epoch: 2439200.2
GCVS period: 251.16, GCVS epoch: 2439193
GCVS spectral type: M2.5pe-M8.2e


 RU Lib
Mean period: 316.55, Mean epoch: 2441855.4
GCVS period: 316.56, GCVS epoch: 2441840
GCVS spectral type: M5e-M6e
SX Lib
Mean period: 332.55, Mean epoch: 2441880.0
GCVS period: 332.9, GCVS epoch: 2441900
GCVS spectral type: M6e:
Lupus
R Lup
Mean period: 234.90, Mean epoch: 2440817.2
GCVS period: 235.62, GCVS epoch: 2440840
GCVS spectral type: M5e


 S Lup
Mean period: 342.85, Mean epoch: 2441777.1
GCVS period: 339.73, GCVS epoch: 2441762
GCVS spectral type: Se


 Y Lup
Mean period: 401.80, Mean epoch: 2441531.1
GCVS period: 396.82, GCVS epoch: 2441520
GCVS spectral type: M7e
Lynx
R Lyn
Mean period: 378.40, Mean epoch: 2445160.8
GCVS period: 378.75, GCVS epoch: 2445175
GCVS spectral type: S2.5,5e-S6,8e:


 S Lyn
Mean period: 297.49, Mean epoch: 2444965.1
GCVS period: 296.34, GCVS epoch: 2444966
GCVS spectral type: M6e-M8.2e


 T Lyn
Mean period: 411.81, Mean epoch: 2443151.8
GCVS period: 406, GCVS epoch: 2443200
GCVS spectral type: C5,2e-C7,1e(NOe)
U Lyn
Mean period: 435.82, Mean epoch: 2445095.2
GCVS period: 433.6, GCVS epoch: 2445111
GCVS spectral type: M7e-M9.5:e


 W Lyn
Mean period: 294.71, Mean epoch: 2442032.4
GCVS period: 295.2, GCVS epoch: 2442050
GCVS spectral type: M6


 X Lyn
Mean period: 321.35, Mean epoch: 2445074.8
GCVS period: 320.8, GCVS epoch: 2445045
GCVS spectral type: M5e
Lyra
S Lyr
Mean period: 438.05, Mean epoch: 2442898.0
GCVS period: 438.4, GCVS epoch: 2442924
GCVS spectral type: SCe


 U Lyr
Mean period: 455.06, Mean epoch: 2442528.7
GCVS period: 451.72, GCVS epoch: 2442492
GCVS spectral type: C4,5e(N0e)


 V Lyr
Mean period: 373.94, Mean epoch: 2445239.9
GCVS period: 373.53, GCVS epoch: 2445209
GCVS spectral type: M7e
W Lyr
Mean period: 196.72, Mean epoch: 2445087.3
GCVS period: 197.88, GCVS epoch: 2445084
GCVS spectral type: M2e-M8e


 Z Lyr
Mean period: 288.27, Mean epoch: 2445235.0
GCVS period: 291.7, GCVS epoch: 2445266
GCVS spectral type: M4e-M5.5:e


 RS Lyr
Mean period: 304.50, Mean epoch: 2442912.2
GCVS period: 301.41, GCVS epoch: 2442919
GCVS spectral type: M5e
RT Lyr
Mean period: 252.10, Mean epoch: 2445136.6
GCVS period: 253.7, GCVS epoch: 2445119
GCVS spectral type: M5e


 RU Lyr
Mean period: 368.71, Mean epoch: 2445141.7
GCVS period: 371.84, GCVS epoch: 2445121
GCVS spectral type: M6e:-M8e


 RW Lyr
Mean period: 502.89, Mean epoch: 2444482.3
GCVS period: 503.75, GCVS epoch: 2444486
GCVS spectral type: M7e
RX Lyr
Mean period: 248.67, Mean epoch: 2444606.1
GCVS period: 247.82, GCVS epoch: 2444585
GCVS spectral type: Me


 RY Lyr
Mean period: 325.89, Mean epoch: 2445330.8
GCVS period: 325.79, GCVS epoch: 2445306
GCVS spectral type: M5e-M6e


 SS Lyr
Mean period: 350.20, Mean epoch: 2445124.6
GCVS period: 346.33, GCVS epoch: 2445090
GCVS spectral type: M5IIIe
ST Lyr
Mean period: 300.03, Mean epoch: 2444430.3
GCVS period: 300.5, GCVS epoch: 2444433
GCVS spectral type: M4IIIe


 SU Lyr
Mean period: 420.34, Mean epoch: 2440809.5
GCVS period: 417.79, GCVS epoch: 2440795
GCVS spectral type:


TV Lyr
Mean period: 261.40, Mean epoch: 2438389.5
GCVS period: 262.31, GCVS epoch: 2438439
GCVS spectral type: M4e
TW Lyr
Mean period: 377.58, Mean epoch: 2443074.9
GCVS period: 376.71, GCVS epoch: 2443039
GCVS spectral type: M6


 TY Lyr
Mean period: 335.01, Mean epoch: 2442712.9
GCVS period: 333.71, GCVS epoch: 2442677
GCVS spectral type: M8e


 UV Lyr
Mean period: 235.30, Mean epoch: 2442342.1
GCVS period: 235.2, GCVS epoch: 2442341
GCVS spectral type:


VZ Lyr
Mean period: 245.18, Mean epoch: 2428039.9
GCVS period: 246.4, GCVS epoch: 2428052
GCVS spectral type: M


 WZ Lyr
Mean period: 376.23, Mean epoch: 2444570.3
GCVS period: 376.64, GCVS epoch: 2444568
GCVS spectral type: M9e


 AB Lyr
Mean period: 216.71, Mean epoch: 2439216.7
GCVS period: 216.5, GCVS epoch: 2439212
GCVS spectral type: M4e
AN Lyr
Mean period: 224.20, Mean epoch: 2437835.6
GCVS period: 224.2, GCVS epoch: 2437872
GCVS spectral type: M7e


 EL Lyr
Mean period: 234.48, Mean epoch: 2435044.3
GCVS period: 234.1, GCVS epoch: 2435040
GCVS spectral type:


Microscopium
R Mic
Mean period: 138.84, Mean epoch: 2443328.9
GCVS period: 138.62, GCVS epoch: 2443311
GCVS spectral type: M4e


 S Mic
Mean period: 208.78, Mean epoch: 2440462.9
GCVS period: 209.68, GCVS epoch: 2440485
GCVS spectral type: M3e-M5.5


 U Mic
Mean period: 334.59, Mean epoch: 2439535.4
GCVS period: 334.29, GCVS epoch: 2439540
GCVS spectral type: M5e-M7e
Monoceros
V Mon
Mean period: 334.24, Mean epoch: 2444938.9
GCVS period: 340.5, GCVS epoch: 2444972
GCVS spectral type: M5e-M8e


 Y Mon
Mean period: 229.85, Mean epoch: 2440629.1
GCVS period: 227.9, GCVS epoch: 2440637
GCVS spectral type: M4e-M8.2e


 RR Mon
Mean period: 394.31, Mean epoch: 2440286.2
GCVS period: 394.7, GCVS epoch: 2440290
GCVS spectral type: S7,2e-S8,2e/M6-10
RS Mon
Mean period: 263.53, Mean epoch: 2438696.4
GCVS period: 263.79, GCVS epoch: 2438703
GCVS spectral type: M3e-M6e:


 RX Mon
Mean period: 342.27, Mean epoch: 2435760.4
GCVS period: 345.7, GCVS epoch: 2435800
GCVS spectral type: M6e-M9


 TT Mon
Mean period: 321.67, Mean epoch: 2438251.9
GCVS period: 323.17, GCVS epoch: 2438323
GCVS spectral type: M5e-M8
Norma
R Nor
Mean period: 495.92, Mean epoch: 2441829.9
GCVS period: 507.5, GCVS epoch: 2441874
GCVS spectral type: M3e-M6II


 T Nor
Mean period: 242.69, Mean epoch: 2440975.6
GCVS period: 240.7, GCVS epoch: 2440976
GCVS spectral type: M3e-M6e
Octans
R Oct
Mean period: 405.51, Mean epoch: 2441992.6
GCVS period: 405.39, GCVS epoch: 2441985
GCVS spectral type: M5.5e


 S Oct
Mean period: 258.86, Mean epoch: 2442022.8
GCVS period: 259, GCVS epoch: 2442032
GCVS spectral type: M4(II)e-M5e


 T Oct
Mean period: 219.18, Mean epoch: 2439533.1
GCVS period: 218.5, GCVS epoch: 2439504
GCVS spectral type: M2e-M4(II:)e
U Oct
Mean period: 302.95, Mean epoch: 2441886.2
GCVS period: 308.44, GCVS epoch: 2441915
GCVS spectral type: M4e-M6(II-III)e
Ophiuchus
R Oph
Mean period: 302.96, Mean epoch: 2445214.5
GCVS period: 306.5, GCVS epoch: 2445234
GCVS spectral type: M4e-M6e


 S Oph
Mean period: 233.72, Mean epoch: 2442257.9
GCVS period: 233.51, GCVS epoch: 2442247
GCVS spectral type: M5e


 T Oph
Mean period: 366.66, Mean epoch: 2441866.6
GCVS period: 366.82, GCVS epoch: 2441874
GCVS spectral type: M6.5e
V Oph
Mean period: 297.83, Mean epoch: 2445073.8
GCVS period: 297.21, GCVS epoch: 2445071
GCVS spectral type: C5,2-C7,4e(N3e)


 W Oph
Mean period: 331.09, Mean epoch: 2438374.4
GCVS period: 332.68, GCVS epoch: 2438414
GCVS spectral type: M8e


 X Oph
Mean period: 333.59, Mean epoch: 2444799.3
GCVS period: 328.85, GCVS epoch: 2444729
GCVS spectral type: M5e-M9e
Z Oph
Mean period: 349.18, Mean epoch: 2442266.1
GCVS period: 348.7, GCVS epoch: 2442238
GCVS spectral type: K3ep-M7.5e


 RR Oph
Mean period: 293.60, Mean epoch: 2443231.9
GCVS period: 292.03, GCVS epoch: 2443184
GCVS spectral type: M3e-M7


 RT Oph
Mean period: 426.89, Mean epoch: 2442650.8
GCVS period: 426.34, GCVS epoch: 2442630
GCVS spectral type: M7e(C)
RU Oph
Mean period: 202.12, Mean epoch: 2440432.3
GCVS period: 202.29, GCVS epoch: 2440445
GCVS spectral type: M3e-M5e


 RY Oph
Mean period: 150.43, Mean epoch: 2445195.1
GCVS period: 150.41, GCVS epoch: 2445205
GCVS spectral type: M3e-M6e


 SS Oph
Mean period: 180.08, Mean epoch: 2444699.0
GCVS period: 180.64, GCVS epoch: 2444729
GCVS spectral type: M5e
AY Oph
Mean period: 194.93, Mean epoch: 2442132.3
GCVS period: 195.27, GCVS epoch: 2442151
GCVS spectral type:


BC Oph
Mean period: 307.80, Mean epoch: 2442921.7
GCVS period: 307.11, GCVS epoch: 2442895
GCVS spectral type: M6e


 V0450 Oph
Mean period: 159.05, Mean epoch: 2440497.0
GCVS period: 158.3, GCVS epoch: 2440464
GCVS spectral type:


Orion
R Ori
Mean period: 378.77, Mean epoch: 2441448.7
GCVS period: 377.1, GCVS epoch: 2441391
GCVS spectral type: C8,2e(Ne)


 S Ori
Mean period: 420.85, Mean epoch: 2443913.6
GCVS period: 414.3, GCVS epoch: 2443945
GCVS spectral type: M6.5e-M9.5e


 U Ori
Mean period: 371.84, Mean epoch: 2445236.2
GCVS period: 368.3, GCVS epoch: 2445254
GCVS spectral type: M6e-M9.5e
V Ori
Mean period: 267.87, Mean epoch: 2439103.2
GCVS period: 263.7, GCVS epoch: 2439082
GCVS spectral type: M3e-M8.0e


 RR Ori
Mean period: 252.00, Mean epoch: 2444242.5
GCVS period: 251.78, GCVS epoch: 2444240
GCVS spectral type: M6.5e-M8