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

Andromeda
R And
Mean period: 409.74, Mean epoch: 2453811.9
GCVS period: 409.2, GCVS epoch: 2453820
GCVS spectral type: S3,5e-S8,8e(M7e)


 T And
Mean period: 280.78, Mean epoch: 2450814.3
GCVS period: 281, GCVS epoch: 2450854
GCVS spectral type: M4e-M7.5e


 U And
Mean period: 346.19, Mean epoch: 2449563.2
GCVS period: 347.7, GCVS epoch: 2449564
GCVS spectral type: M6e
V And
Mean period: 257.91, Mean epoch: 2451540.9
GCVS period: 256.4, GCVS epoch: 2451528
GCVS spectral type: M2e-M3e


 W And
Mean period: 396.06, Mean epoch: 2448678.9
GCVS period: 397.3, GCVS epoch: 2448654
GCVS spectral type: S6,1e-S9,2e


 X And
Mean period: 345.80, Mean epoch: 2449641.5
GCVS period: 343.4, GCVS epoch: 2449620
GCVS spectral type: S2,9e-S5,5e
Y And
Mean period: 220.90, Mean epoch: 2449502.8
GCVS period: 220.5, GCVS epoch: 2449489
GCVS spectral type: M3e-M4.5e


 RR And
Mean period: 327.93, Mean epoch: 2449631.1
GCVS period: 330.6, GCVS epoch: 2449644
GCVS spectral type: S6.5,2e


 RW And
Mean period: 430.00, Mean epoch: 2453384.6
GCVS period: 430, GCVS epoch: 2453360
GCVS spectral type: M5e-M10e(S6,2e)
RY And
Mean period: 392.49, Mean epoch: 2453408.3
GCVS period: 391.2, GCVS epoch: 2453400
GCVS spectral type: M8


 SV And
Mean period: 315.45, Mean epoch: 2453252.8
GCVS period: 313, GCVS epoch: 2453220
GCVS spectral type: M5e-M7e


 SX And
Mean period: 332.57, Mean epoch: 2453193.7
GCVS period: 332.8, GCVS epoch: 2453208
GCVS spectral type: M6.5e
SZ And
Mean period: 342.74, Mean epoch: 2453502.3
GCVS period: 344, GCVS epoch: 2453520
GCVS spectral type: M2e


 TU And
Mean period: 317.17, Mean epoch: 2453665.9
GCVS period: 316.8, GCVS epoch: 2453700
GCVS spectral type: M5e


 UW And
Mean period: 239.84, Mean epoch: 2454019.3
GCVS period: 237, GCVS epoch: 2454024
GCVS spectral type: M5
UZ And
Mean period: 314.64, Mean epoch: 2454004.1
GCVS period: 316, GCVS epoch: 2453990
GCVS spectral type: M7e


 YZ And
Mean period: 207.54, Mean epoch: 2454091.3
GCVS period: 207, GCVS epoch: 2454092
GCVS spectral type: M5e


 AX And
Mean period: 380.81, Mean epoch: 2451986.6
GCVS period: 378, GCVS epoch: 2451980
GCVS spectral type:


BG And
Mean period: 291.78, Mean epoch: 2454038.9
GCVS period: 289.5, GCVS epoch: 2454045
GCVS spectral type: S6.5,5e


 BU And
Mean period: 382.72, Mean epoch: 2453629.1
GCVS period: 378, GCVS epoch: 2453585
GCVS spectral type: M7e
Antlia
V Ant
Mean period: 302.19, Mean epoch: 2452778.9
GCVS period: 303, GCVS epoch: 2452772
GCVS spectral type: M7IIIe


 X Ant
Mean period: 161.92, Mean epoch: 2453452.5
GCVS period: 164.1, GCVS epoch: 2453458
GCVS spectral type: M2-M6e
Apus
T Aps
Mean period: 261.26, Mean epoch: 2441105.8
GCVS period: 261.03, GCVS epoch: 2441096
GCVS spectral type: M3e
Aquarius
R Aqr
Mean period: 386.77, Mean epoch: 2454013.4
GCVS period: 390, GCVS epoch: 2454045
GCVS spectral type: M5e-M8.5e+pec


 S Aqr
Mean period: 279.27, Mean epoch: 2452081.5
GCVS period: 279.3, GCVS epoch: 2452107
GCVS spectral type: M4e-M6e


 T Aqr
Mean period: 201.89, Mean epoch: 2453247.5
GCVS period: 201.1, GCVS epoch: 2453229
GCVS spectral type: M2e-M5.5e
W Aqr
Mean period: 380.58, Mean epoch: 2453953.2
GCVS period: 376.1, GCVS epoch: 2453940
GCVS spectral type: M6-M8e


 X Aqr
Mean period: 311.60, Mean epoch: 2452947.9
GCVS period: 311.4, GCVS epoch: 2452951
GCVS spectral type: S6,3e:(M4e-M6.5e)


 Y Aqr
Mean period: 381.76, Mean epoch: 2452262.5
GCVS period: 382.34, GCVS epoch: 2452240
GCVS spectral type: M6.5e-M9
RR Aqr
Mean period: 182.47, Mean epoch: 2453963.8
GCVS period: 182.45, GCVS epoch: 2453954
GCVS spectral type: M2e-M4e


 RS Aqr
Mean period: 215.96, Mean epoch: 2453902.5
GCVS period: 221.3, GCVS epoch: 2454005
GCVS spectral type: M2e
Aquila
R Aql
Mean period: 298.83, Mean epoch: 2443129.6
GCVS period: 284.2, GCVS epoch: 2443458
GCVS spectral type: M5e-M9IIIe


 W Aql
Mean period: 487.95, Mean epoch: 2439043.1
GCVS period: 490.43, GCVS epoch: 2439116
GCVS spectral type: S3,9e-S6,9e


 X Aql
Mean period: 346.32, Mean epoch: 2441467.8
GCVS period: 347.04, GCVS epoch: 2441487
GCVS spectral type: M6e
Z Aql
Mean period: 129.42, Mean epoch: 2441944.5
GCVS period: 129.226, GCVS epoch: 2441938
GCVS spectral type: M3e


 RR Aql
Mean period: 395.51, Mean epoch: 2441779.6
GCVS period: 394.78, GCVS epoch: 2441764
GCVS spectral type: M6e-M9


 RS Aql
Mean period: 410.23, Mean epoch: 2439247.3
GCVS period: 410.12, GCVS epoch: 2439193
GCVS spectral type: M5e-M8
RT Aql
Mean period: 327.73, Mean epoch: 2443299.6
GCVS period: 327.11, GCVS epoch: 2443290
GCVS spectral type: M6e-M9p(S)


 RU Aql
Mean period: 274.68, Mean epoch: 2439168.2
GCVS period: 274.24, GCVS epoch: 2439171
GCVS spectral type: M5e


 RV Aql
Mean period: 218.54, Mean epoch: 2442620.6
GCVS period: 218.6, GCVS epoch: 2442618
GCVS spectral type: M2e-M7:e
SV Aql
Mean period: 252.39, Mean epoch: 2439125.2
GCVS period: 252.89, GCVS epoch: 2439170
GCVS spectral type: M8


 SY Aql
Mean period: 355.82, Mean epoch: 2442652.0
GCVS period: 355.92, GCVS epoch: 2442651
GCVS spectral type: M5e-M7e


 TU Aql
Mean period: 270.32, Mean epoch: 2442950.1
GCVS period: 270.39, GCVS epoch: 2442930
GCVS spectral type: M2e-M9
EU Aql
Mean period: 323.27, Mean epoch: 2427300.2
GCVS period: 321, GCVS epoch: 2427299
GCVS spectral type: M9
Ara
U Ara
Mean period: 225.12, Mean epoch: 2451984.2
GCVS period: 224.6, GCVS epoch: 2451981
GCVS spectral type: M3IIep
Aries
R Ari
Mean period: 186.82, Mean epoch: 2453649.7
GCVS period: 185.67, GCVS epoch: 2453640
GCVS spectral type: M3e-M6e


 S Ari
Mean period: 292.50, Mean epoch: 2453698.4
GCVS period: 291, GCVS epoch: 2453710
GCVS spectral type: M4e-M5e


 T Ari
Mean period: 320.52, Mean epoch: 2452535.8
GCVS period: 340, GCVS epoch: 2452600
GCVS spectral type: M6e-M8e
U Ari
Mean period: 371.83, Mean epoch: 2453651.7
GCVS period: 371.1, GCVS epoch: 2453658
GCVS spectral type: M4e-M7.5e
Auriga
R Aur
Mean period: 457.31, Mean epoch: 2444025.9
GCVS period: 457.51, GCVS epoch: 2444004
GCVS spectral type: M6.5e-M9.5e


 U Aur
Mean period: 408.27, Mean epoch: 2443577.6
GCVS period: 408.09, GCVS epoch: 2443579
GCVS spectral type: M7e-M9e


 V Aur
Mean period: 352.98, Mean epoch: 2443439.9
GCVS period: 353, GCVS epoch: 2443435
GCVS spectral type: C6,2e(N3e)
W Aur
Mean period: 273.74, Mean epoch: 2443150.8
GCVS period: 274.27, GCVS epoch: 2443165
GCVS spectral type: M3e-M8e


 X Aur
Mean period: 164.18, Mean epoch: 2444646.2
GCVS period: 163.79, GCVS epoch: 2444604
GCVS spectral type: M3e-M7e


 RR Aur
Mean period: 308.79, Mean epoch: 2443071.4
GCVS period: 307.87, GCVS epoch: 2443031
GCVS spectral type: M3e-M7e
RU Aur
Mean period: 468.79, Mean epoch: 2442597.9
GCVS period: 466.47, GCVS epoch: 2442520
GCVS spectral type: M7e-M9e


 ST Aur
Mean period: 292.27, Mean epoch: 2438310.7
GCVS period: 291.94, GCVS epoch: 2438302
GCVS spectral type:


SZ Aur
Mean period: 455.51, Mean epoch: 2439069.7
GCVS period: 454.04, GCVS epoch: 2439048
GCVS spectral type: M8e
UV Aur
Mean period: 393.89, Mean epoch: 2441064.0
GCVS period: 394.42, GCVS epoch: 2441062
GCVS spectral type: C6,2-C8,2Jep(Ne)


 VX Aur
Mean period: 325.04, Mean epoch: 2438790.4
GCVS period: 322.25, GCVS epoch: 2438673
GCVS spectral type: M5e


 VY Aur
Mean period: 400.03, Mean epoch: 2438055.3
GCVS period: 402.1, GCVS epoch: 2438122
GCVS spectral type: M8e
AA Aur
Mean period: 267.04, Mean epoch: 2442935.3
GCVS period: 270.17, GCVS epoch: 2442907
GCVS spectral type: M3e


 AZ Aur
Mean period: 415.56, Mean epoch: 2442870.5
GCVS period: 415.92, GCVS epoch: 2442866
GCVS spectral type: C7,1e-C8,2-3(N0e)


 GQ Aur
Mean period: 305.12, Mean epoch: 2443925.8
GCVS period: 304.75, GCVS epoch: 2443918
GCVS spectral type: M3
Bootes
R Boo
Mean period: 223.50, Mean epoch: 2444527.2
GCVS period: 223.4, GCVS epoch: 2444518
GCVS spectral type: M3e-M8e


 S Boo
Mean period: 271.07, Mean epoch: 2444149.2
GCVS period: 270.73, GCVS epoch: 2444116
GCVS spectral type: M3e-M6e


 Z Boo
Mean period: 280.95, Mean epoch: 2441081.0
GCVS period: 281.14, GCVS epoch: 2441096
GCVS spectral type: M5e-M6e
RR Boo
Mean period: 194.74, Mean epoch: 2443042.8
GCVS period: 194.7, GCVS epoch: 2443047
GCVS spectral type: M2e-M6e


 RT Boo
Mean period: 272.54, Mean epoch: 2442654.2
GCVS period: 273.86, GCVS epoch: 2442722
GCVS spectral type: M6.5e-M8e
Caelum
R Cae
Mean period: 392.00, Mean epoch: 2440709.8
GCVS period: 390.95, GCVS epoch: 2440645
GCVS spectral type: M6e-M9e
Camelopardalis
R Cam
Mean period: 270.29, Mean epoch: 2443963.6
GCVS period: 270.22, GCVS epoch: 2443978
GCVS spectral type: S2,8e-S8,7e


 T Cam
Mean period: 373.92, Mean epoch: 2443457.5
GCVS period: 373.2, GCVS epoch: 2443433
GCVS spectral type: S4,7e-S8.5,8e


 V Cam
Mean period: 522.61, Mean epoch: 2443384.8
GCVS period: 522.45, GCVS epoch: 2443402
GCVS spectral type: M7e
W Cam
Mean period: 284.33, Mean epoch: 2435164.7
GCVS period: 283.6, GCVS epoch: 2435213
GCVS spectral type: M7


 X Cam
Mean period: 143.70, Mean epoch: 2444669.8
GCVS period: 143.56, GCVS epoch: 2444679
GCVS spectral type: K8-M8e


 RT Cam
Mean period: 365.66, Mean epoch: 2443797.8
GCVS period: 366.31, GCVS epoch: 2443837
GCVS spectral type: M6e
SU Cam
Mean period: 285.19, Mean epoch: 2444273.6
GCVS period: 285.03, GCVS epoch: 2444265
GCVS spectral type: M5


 SW Cam
Mean period: 254.76, Mean epoch: 2443403.4
GCVS period: 252.8, GCVS epoch: 2443419
GCVS spectral type: M5e


 UZ Cam
Mean period: 232.47, Mean epoch: 2443837.6
GCVS period: 225.64, GCVS epoch: 2443773
GCVS spectral type: M3
Cancer
R Cnc
Mean period: 361.88, Mean epoch: 2444226.2
GCVS period: 361.6, GCVS epoch: 2444231
GCVS spectral type: M6e-M9e


 U Cnc
Mean period: 305.01, Mean epoch: 2440650.8
GCVS period: 304.78, GCVS epoch: 2440627
GCVS spectral type: M2e


 V Cnc
Mean period: 272.13, Mean epoch: 2443488.6
GCVS period: 272.13, GCVS epoch: 2443485
GCVS spectral type: S0e-S7,9e
W Cnc
Mean period: 393.36, Mean epoch: 2443872.8
GCVS period: 393.22, GCVS epoch: 2443896
GCVS spectral type: M6.5e-M9e


 RR Cnc
Mean period: 298.31, Mean epoch: 2441398.1
GCVS period: 298.26, GCVS epoch: 2441400
GCVS spectral type: M3e
Canes Venatici
R CVn
Mean period: 328.60, Mean epoch: 2443574.7
GCVS period: 328.53, GCVS epoch: 2443586
GCVS spectral type: M6e-M9e


 T CVn
Mean period: 290.35, Mean epoch: 2442758.3
GCVS period: 290.09, GCVS epoch: 2442784
GCVS spectral type: M6.5e


 U CVn
Mean period: 345.50, Mean epoch: 2442457.0
GCVS period: 345.65, GCVS epoch: 2442491
GCVS spectral type: M7e
RT CVn
Mean period: 253.78, Mean epoch: 2434408.4
GCVS period: 253.6, GCVS epoch: 2434400
GCVS spectral type: M5e
Canis Minor
R CMi
Mean period: 337.70, Mean epoch: 2441317.8
GCVS period: 337.78, GCVS epoch: 2441323
GCVS spectral type: C0ev


 S CMi
Mean period: 333.07, Mean epoch: 2443877.0
GCVS period: 332.94, GCVS epoch: 2443911
GCVS spectral type: M6e-M8e


 T CMi
Mean period: 320.50, Mean epoch: 2441946.7
GCVS period: 328.3, GCVS epoch: 2442045
GCVS spectral type: M4Se-M8
U CMi
Mean period: 411.50, Mean epoch: 2443146.2
GCVS period: 413.88, GCVS epoch: 2443150
GCVS spectral type: M4e


 V CMi
Mean period: 366.31, Mean epoch: 2442752.3
GCVS period: 366.1, GCVS epoch: 2442737
GCVS spectral type: M4e-M10