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

Capricornus
R Cap
Mean period: 344.88, Mean epoch: 2439002.5
GCVS period: 345.13, GCVS epoch: 2439014
GCVS spectral type: C(Ne)


 T Cap
Mean period: 269.81, Mean epoch: 2439303.1
GCVS period: 269.28, GCVS epoch: 2439267
GCVS spectral type: M2e-M6e


 U Cap
Mean period: 203.18, Mean epoch: 2438960.5
GCVS period: 203.14, GCVS epoch: 2438975
GCVS spectral type: Me
V Cap
Mean period: 275.49, Mean epoch: 2440383.8
GCVS period: 275.72, GCVS epoch: 2440395
GCVS spectral type: M5e-M6e


 W Cap
Mean period: 208.00, Mean epoch: 2438891.3
GCVS period: 209.67, GCVS epoch: 2438948
GCVS spectral type: M5e


 X Cap
Mean period: 217.94, Mean epoch: 2438968.1
GCVS period: 217.94, GCVS epoch: 2438971
GCVS spectral type:


Y Cap
Mean period: 410.23, Mean epoch: 2416793.2
GCVS period: 411.76, GCVS epoch: 2416735
GCVS spectral type:


Z Cap
Mean period: 181.56, Mean epoch: 2442014.8
GCVS period: 181.48, GCVS epoch: 2442017
GCVS spectral type: M1e-M4e


 RR Cap
Mean period: 278.21, Mean epoch: 2439125.1
GCVS period: 277.54, GCVS epoch: 2439096
GCVS spectral type: M5e-M6e
RU Cap
Mean period: 347.95, Mean epoch: 2438896.2
GCVS period: 347.37, GCVS epoch: 2438891
GCVS spectral type: M9e
Carina
R Car
Mean period: 308.11, Mean epoch: 2441969.0
GCVS period: 308.71, GCVS epoch: 2442000
GCVS spectral type: M4e-M8e


 S Car
Mean period: 149.66, Mean epoch: 2442122.7
GCVS period: 149.49, GCVS epoch: 2442112
GCVS spectral type: K5e-M6e


 Z Car
Mean period: 384.22, Mean epoch: 2439437.9
GCVS period: 384.01, GCVS epoch: 2439448
GCVS spectral type: M6e
RV Car
Mean period: 367.68, Mean epoch: 2438980.3
GCVS period: 365.68, GCVS epoch: 2438937
GCVS spectral type: M6e


 RW Car
Mean period: 318.72, Mean epoch: 2438948.4
GCVS period: 318.62, GCVS epoch: 2438991
GCVS spectral type: M4e-M7e


 RY Car
Mean period: 421.30, Mean epoch: 2438754.2
GCVS period: 424.3, GCVS epoch: 2438744
GCVS spectral type: S7,8e
RZ Car
Mean period: 272.51, Mean epoch: 2439583.9
GCVS period: 272.77, GCVS epoch: 2439586
GCVS spectral type: M4e-M8e


 AF Car
Mean period: 442.56, Mean epoch: 2438243.6
GCVS period: 453, GCVS epoch: 2438125
GCVS spectral type: M8e
Cassiopeia
R Cas
Mean period: 430.80, Mean epoch: 2444496.8
GCVS period: 430.46, GCVS epoch: 2444463
GCVS spectral type: M6e-M10e


 S Cas
Mean period: 612.65, Mean epoch: 2443848.7
GCVS period: 612.43, GCVS epoch: 2443870
GCVS spectral type: S3,4e-S5,8e


 T Cas
Mean period: 444.51, Mean epoch: 2444101.9
GCVS period: 444.83, GCVS epoch: 2444160
GCVS spectral type: M6e-M9e
U Cas
Mean period: 276.93, Mean epoch: 2444623.9
GCVS period: 277.19, GCVS epoch: 2444621
GCVS spectral type: S3,5e-S8,6e


 V Cas
Mean period: 228.86, Mean epoch: 2444577.0
GCVS period: 228.83, GCVS epoch: 2444605
GCVS spectral type: M5e-M8.5e


 W Cas
Mean period: 405.69, Mean epoch: 2444205.7
GCVS period: 405.57, GCVS epoch: 2444209
GCVS spectral type: C7,1e(SC5/9e)
X Cas
Mean period: 423.77, Mean epoch: 2443925.0
GCVS period: 422.84, GCVS epoch: 2443922
GCVS spectral type: C5,4e(N1e)


 Y Cas
Mean period: 413.27, Mean epoch: 2444538.0
GCVS period: 413.48, GCVS epoch: 2444506
GCVS spectral type: M6e-M8e


 Z Cas
Mean period: 496.82, Mean epoch: 2442416.1
GCVS period: 495.71, GCVS epoch: 2442376
GCVS spectral type: M7e
RR Cas
Mean period: 299.45, Mean epoch: 2444427.7
GCVS period: 300.07, GCVS epoch: 2444470
GCVS spectral type: M5e


 RV Cas
Mean period: 332.19, Mean epoch: 2444320.9
GCVS period: 331.68, GCVS epoch: 2444313
GCVS spectral type: M5.5e-M6.5Se


 SS Cas
Mean period: 139.78, Mean epoch: 2444180.9
GCVS period: 140.57, GCVS epoch: 2444208
GCVS spectral type: M3e-M7e
TY Cas
Mean period: 626.43, Mean epoch: 2443629.2
GCVS period: 645, GCVS epoch: 2443405
GCVS spectral type: M6


 VZ Cas
Mean period: 169.20, Mean epoch: 2444681.2
GCVS period: 169.24, GCVS epoch: 2444676
GCVS spectral type: M0e-M3e


 WY Cas
Mean period: 477.64, Mean epoch: 2444341.7
GCVS period: 476.56, GCVS epoch: 2444310
GCVS spectral type: S6,5pe+G
V0666 Cas
Mean period: 424.62, Mean epoch: 2457033.1
GCVS period: 424, GCVS epoch: 2457000
GCVS spectral type:


V0667 Cas
Mean period: 347.85, Mean epoch: 2457333.5
GCVS period: 347.6, GCVS epoch: 2457329
GCVS spectral type:


Centaurus
R Cen
Mean period: 542.60, Mean epoch: 2441817.4
GCVS period: 546.2, GCVS epoch: 2441942
GCVS spectral type: M4e-M9.5


 U Cen
Mean period: 220.10, Mean epoch: 2439929.3
GCVS period: 220.28, GCVS epoch: 2439941
GCVS spectral type: M3II:e-M6.5e


 W Cen
Mean period: 201.50, Mean epoch: 2441784.1
GCVS period: 201.57, GCVS epoch: 2441786
GCVS spectral type: M3e-M8(III)e
X Cen
Mean period: 315.87, Mean epoch: 2441729.3
GCVS period: 315.1, GCVS epoch: 2441709
GCVS spectral type: M5e-M8e


 RS Cen
Mean period: 164.32, Mean epoch: 2441965.9
GCVS period: 164.37, GCVS epoch: 2441966
GCVS spectral type: M2e-M6.5e


 RT Cen
Mean period: 255.39, Mean epoch: 2442104.1
GCVS period: 255.02, GCVS epoch: 2442098
GCVS spectral type: M6e-M9e
RV Cen
Mean period: 446.17, Mean epoch: 2440985.3
GCVS period: 446, GCVS epoch: 2440960
GCVS spectral type: C(N3e)


 RX Cen
Mean period: 328.21, Mean epoch: 2442107.8
GCVS period: 327.9, GCVS epoch: 2442114
GCVS spectral type: M5e-M8e


 BE Cen
Mean period: 200.76, Mean epoch: 2428699.9
GCVS period: 201.56, GCVS epoch: 2428740
GCVS spectral type: Me
Cepheus
S Cep
Mean period: 486.33, Mean epoch: 2443765.2
GCVS period: 486.84, GCVS epoch: 2443787
GCVS spectral type: C7,4e(N8e)


 T Cep
Mean period: 389.56, Mean epoch: 2444252.6
GCVS period: 388.14, GCVS epoch: 2444177
GCVS spectral type: M5-M9IIIe


 X Cep
Mean period: 536.42, Mean epoch: 2443871.2
GCVS period: 535.19, GCVS epoch: 2443834
GCVS spectral type: M4e-M7e
Y Cep
Mean period: 332.70, Mean epoch: 2444136.0
GCVS period: 332.57, GCVS epoch: 2444134
GCVS spectral type: M5e-M6e


 Z Cep
Mean period: 279.08, Mean epoch: 2442143.9
GCVS period: 279.16, GCVS epoch: 2442156
GCVS spectral type: M2e-M7e


 RR Cep
Mean period: 384.26, Mean epoch: 2443603.0
GCVS period: 384.18, GCVS epoch: 2443601
GCVS spectral type: M6e-M8e
RY Cep
Mean period: 149.49, Mean epoch: 2444566.2
GCVS period: 149.06, GCVS epoch: 2444533
GCVS spectral type: M0e


 SZ Cep
Mean period: 327.36, Mean epoch: 2442652.4
GCVS period: 326.59, GCVS epoch: 2442624
GCVS spectral type: S3.5,8e-S4,8:e


 AB Cep
Mean period: 324.29, Mean epoch: 2441136.4
GCVS period: 324.5, GCVS epoch: 2441160
GCVS spectral type: M8e
AX Cep
Mean period: 397.25, Mean epoch: 2437044.0
GCVS period: 395, GCVS epoch: 2437023
GCVS spectral type: C(N)


 BF Cep
Mean period: 429.71, Mean epoch: 2444184.5
GCVS period: 430.14, GCVS epoch: 2444248
GCVS spectral type: M7
Cetus
R Cet
Mean period: 166.12, Mean epoch: 2443775.3
GCVS period: 166.24, GCVS epoch: 2443768
GCVS spectral type: M4e-M9


 S Cet
Mean period: 319.97, Mean epoch: 2442608.0
GCVS period: 320.45, GCVS epoch: 2442650
GCVS spectral type: M3e-M6.5e:


 U Cet
Mean period: 234.57, Mean epoch: 2442137.2
GCVS period: 234.76, GCVS epoch: 2442137
GCVS spectral type: M2e-M6e
V Cet
Mean period: 260.37, Mean epoch: 2438795.4
GCVS period: 257.82, GCVS epoch: 2438792
GCVS spectral type: M3e


 W Cet
Mean period: 351.06, Mean epoch: 2438570.2
GCVS period: 351.31, GCVS epoch: 2438578
GCVS spectral type: S6,3e-S9,2e


 X Cet
Mean period: 177.51, Mean epoch: 2441955.6
GCVS period: 177.14, GCVS epoch: 2441953
GCVS spectral type: M2e(S)-M6e
Z Cet
Mean period: 184.86, Mean epoch: 2441673.9
GCVS period: 184.81, GCVS epoch: 2441679
GCVS spectral type: M1e-M6.5e


 omi Cet
Mean period: 331.88, Mean epoch: 2444800.3
GCVS period: 331.96, GCVS epoch: 2444839
GCVS spectral type: M5e-M9e
Chamaeleon
R Cha
Mean period: 333.93, Mean epoch: 2441986.4
GCVS period: 334.58, GCVS epoch: 2442006
GCVS spectral type: M4e-M7e
Columba
R Col
Mean period: 327.87, Mean epoch: 2442010.6
GCVS period: 327.62, GCVS epoch: 2442016
GCVS spectral type: M3e-M7


 S Col
Mean period: 325.82, Mean epoch: 2440568.7
GCVS period: 325.85, GCVS epoch: 2440559
GCVS spectral type: M6e-M8


 T Col
Mean period: 225.99, Mean epoch: 2441968.2
GCVS period: 225.84, GCVS epoch: 2441973
GCVS spectral type: M3e-M6e
Coma Berenices
R Com
Mean period: 362.49, Mean epoch: 2443498.0
GCVS period: 362.82, GCVS epoch: 2443539
GCVS spectral type: M5e-M8ep
Corona Austrina
U CrA
Mean period: 147.57, Mean epoch: 2433190.4
GCVS period: 147.5, GCVS epoch: 2433175
GCVS spectral type: M2Ibe
Corona Borealis
S CrB
Mean period: 360.28, Mean epoch: 2444633.5
GCVS period: 360.26, GCVS epoch: 2444604
GCVS spectral type: M6e-M8e


 V CrB
Mean period: 357.77, Mean epoch: 2443767.7
GCVS period: 357.63, GCVS epoch: 2443763
GCVS spectral type: C6,2e(N2e)


 W CrB
Mean period: 238.60, Mean epoch: 2444196.5
GCVS period: 238.4, GCVS epoch: 2444192
GCVS spectral type: M2e-M5e
X CrB
Mean period: 240.93, Mean epoch: 2443695.1
GCVS period: 241.17, GCVS epoch: 2443719
GCVS spectral type: M5e-M7e


 Z CrB
Mean period: 250.88, Mean epoch: 2442504.1
GCVS period: 250.68, GCVS epoch: 2442514
GCVS spectral type: M4e-M5e
Corvus
R Crv
Mean period: 317.01, Mean epoch: 2442792.2
GCVS period: 317.03, GCVS epoch: 2442781
GCVS spectral type: M4.5e-M9:e


 U Crv
Mean period: 283.50, Mean epoch: 2438478.3
GCVS period: 283.42, GCVS epoch: 2438480
GCVS spectral type: M5e


 V Crv
Mean period: 194.03, Mean epoch: 2429363.5
GCVS period: 193.63, GCVS epoch: 2429381
GCVS spectral type: M2e
Crater
U Crt
Mean period: 168.09, Mean epoch: 2428263.7
GCVS period: 169, GCVS epoch: 2428269
GCVS spectral type: M0e
Crux
BH Cru
Mean period: 460.98, Mean epoch: 2441542.4
GCVS period: 421, GCVS epoch: 2440858
GCVS spectral type: SC4.5/8-e-SC7/8-e
Cygnus
R Cyg
Mean period: 426.86, Mean epoch: 2444582.4
GCVS period: 426.45, GCVS epoch: 2444595
GCVS spectral type: S2.5,9e-S6,9e(Tc)


 S Cyg
Mean period: 323.25, Mean epoch: 2444125.2
GCVS period: 322.93, GCVS epoch: 2444097
GCVS spectral type: S2.5,1e(M3.5-M7e)


 U Cyg
Mean period: 465.11, Mean epoch: 2444549.2
GCVS period: 463.24, GCVS epoch: 2444558
GCVS spectral type: C7,2e-C9,2(Npe)
V Cyg
Mean period: 420.98, Mean epoch: 2443987.1
GCVS period: 421.27, GCVS epoch: 2444038
GCVS spectral type: C5,3e-C7,4e(Npe)


 Z Cyg
Mean period: 263.86, Mean epoch: 2444611.1
GCVS period: 263.69, GCVS epoch: 2444618
GCVS spectral type: M5e-M9e


 RT Cyg
Mean period: 190.26, Mean epoch: 2444585.6
GCVS period: 190.28, GCVS epoch: 2444588
GCVS spectral type: M2e-M8.8eIb
ST Cyg
Mean period: 337.49, Mean epoch: 2444428.2
GCVS period: 337.29, GCVS epoch: 2444476
GCVS spectral type: M5.5e-M8.0e


 SX Cyg
Mean period: 411.26, Mean epoch: 2444090.7
GCVS period: 411.02, GCVS epoch: 2444080
GCVS spectral type: M7e


 TU Cyg
Mean period: 219.57, Mean epoch: 2444761.7
GCVS period: 219.44, GCVS epoch: 2444765
GCVS spectral type: M3e-M6e
TW Cyg
Mean period: 342.50, Mean epoch: 2439199.6
GCVS period: 340.86, GCVS epoch: 2439136
GCVS spectral type: M6.5-M10ep


 TY Cyg
Mean period: 350.53, Mean epoch: 2441948.1
GCVS period: 349, GCVS epoch: 2441875
GCVS spectral type: M6e-M8e


 UX Cyg
Mean period: 567.34, Mean epoch: 2444441.7
GCVS period: 565, GCVS epoch: 2444421
GCVS spectral type: M4e-M6.5e
WX Cyg
Mean period: 409.32, Mean epoch: 2440461.3
GCVS period: 410.45, GCVS epoch: 2440480
GCVS spectral type: C8,2JLi(N3e)


 WY Cyg
Mean period: 304.66, Mean epoch: 2444824.1
GCVS period: 304.54, GCVS epoch: 2444832
GCVS spectral type: M5e-M6e


 AU Cyg
Mean period: 434.02, Mean epoch: 2442330.1
GCVS period: 435.31, GCVS epoch: 2442325
GCVS spectral type: M6e-M7e
BG Cyg
Mean period: 288.68, Mean epoch: 2443760.7
GCVS period: 288, GCVS epoch: 2443784
GCVS spectral type: M7e-M8e


 BU Cyg
Mean period: 158.07, Mean epoch: 2433096.4
GCVS period: 157.87, GCVS epoch: 2433096
GCVS spectral type: M0


 CM Cyg
Mean period: 254.66, Mean epoch: 2444347.8
GCVS period: 254.83, GCVS epoch: 2444359
GCVS spectral type: SC2-S4e
CN Cyg
Mean period: 198.87, Mean epoch: 2444588.0
GCVS period: 198.53, GCVS epoch: 2444577
GCVS spectral type: M2-M7e(S)


 CU Cyg
Mean period: 214.24, Mean epoch: 2437958.2
GCVS period: 213.6, GCVS epoch: 2437958
GCVS spectral type: M6e


 DD Cyg
Mean period: 148.02, Mean epoch: 2444563.6
GCVS period: 147.6, GCVS epoch: 2444568
GCVS spectral type: M0e
DR Cyg
Mean period: 313.32, Mean epoch: 2439414.4
GCVS period: 313.88, GCVS epoch: 2439419
GCVS spectral type: M5e


 FF Cyg
Mean period: 324.57, Mean epoch: 2444488.5
GCVS period: 323.82, GCVS epoch: 2444456
GCVS spectral type: S6,8e(M4e)


 LV Cyg
Mean period: 368.73, Mean epoch: 2433371.9
GCVS period: 370.4, GCVS epoch: 2433403
GCVS spectral type: M7
LX Cyg
Mean period: 492.18, Mean epoch: 2439351.9
GCVS period: 465.3, GCVS epoch: 2438895
GCVS spectral type: SC3e-S5,5e:


 V0369 Cyg
Mean period: 104.74, Mean epoch: 2444825.5
GCVS period: 104.76, GCVS epoch: 2444799
GCVS spectral type: M4e


 V0462 Cyg
Mean period: 372.01, Mean epoch: 2439688.8
GCVS period: 366.68, GCVS epoch: 2439650
GCVS spectral type: M7e
V1760 Cyg
Mean period: 298.69, Mean epoch: 2436825.1
GCVS period: 298, GCVS epoch: 2436830
GCVS spectral type: M4e


 chi Cyg
Mean period: 407.26, Mean epoch: 2442114.4
GCVS period: 408.05, GCVS epoch: 2442140
GCVS spectral type: S6,2e-S10,4e(MSe)