O-C diagram of Mira stars

Here are O-C diagrams for a selection of Mira stars. The diagrams shows the cycle number (E) on the x-axis and O-C in days on the y-axis. The red dots are maxima that are fitted from observations, the lightblue are maxima published by AAVSO and the darkblue are maxima collected from various other published sources. The fitted maxima are based on observation data from AAVSO, AFOEV, VSOLJ, BAA/VSS, ASAS-SN and DASCH and calculated by using a mean lightcurve for each star. The mean lightcurves used can be found here. For a maxima to be recognized it had to fulfil these criteria:
- At least 12 observations around the maximum.
- At least 5 observations before and 5 observations after the peak observation.
- At least an amplitude of 1.5 magnitudes between the peak observation and the observations before and after.
- Only observations in a span of 80% of the variable's period around the peak observation is used.
When a maximum fulfilling the criteria was found the mean lightcurve was fitted to the observations and the time and magnitude was noted. A preliminary O-C was then calculated by using the elements from GCVS4. In some cases a manual correction of the O-C was needed if the O-C is out of phase with more than a half cycle. From these O-C values an adjusted mean period and epoch was derived and new O-C values were calculated and plotted in the diagrams below.
The AAVSO maxima have been adjusted with a fixed offset for each star to get the datasets in line with each other.

By clicking on the graph a table with the underlying data is presented.

Under each graph are some data about the star and the diagram.
The 1st row shows the new mean period and epoch. LC is a link to the mean lightcurve for the star. Avg is a link to a smoothened O-C diagram constructed by using a moving average of 7 points around each point in the original diagram. Per is a link to a diagram that shows the star's period over time.
The 2nd row shows the result of an linear fit to the GCVS4 O-C values. ΔP is the slope in days/cycle. The GCVS4 period is added by this amount to get the new mean period. The ± is the standard error for the coefficient. t: is the t-statistics (ΔP / standard error) and suggest the significance of the linear fit, r2: shows the coefficient of determination for the fit. ΔEpoch is the interception point with the y-axis. The GCVS4 epoch is adjusted by this amount to get the new mean epoch.
The 3rd row shows the same thing but for a parabolic fit. A parabolic O-C diagram suggest that the period is changing in a steady pace and ΔP/C shows the amount in days per cycle that best fit the diagram. Care should be taken not to overestimate this information as most O-C diagram shows a lot of random scatter in the period that can create false relations. Stars with a high value of t: and a r2: near 1 could be candidates for Miras with a continuous changing period.
The colour for ΔP and ΔP/C is red for t: <5 and green for t: >= 5 to easier see where there is a high statistically significance. ΔP and ΔP/C is also clickable. ΔP shows a diagram with the original GCVS4 elements and ΔP/C shows the residuals when the parabolic part of the curve is removed.
The 4th row shows the mean magnitude at max ± standard deviation. The extreme values are showed within parentheses.
The 5th row shows the original period and epoch from GCVS4.
The 6th row shows the spectral type from GCVS4.
The 7th and 8th row is the result of the Eddington/Plakidis test. Before the test is made the linear component of the diagram is removed and is then done with X<=15 and X<=5. This test is to see if the changes in the O-C is likely due to small random cycle-to-cycle fluctuations or a real change of the period. See Irregularities of period of long-period variable stars for more information about this test. In short ε is the average random error in the period and a is the average error in determine the time for maximum. The star falls outside the test if the term 2a2 have a big negative value and could be a sign of real period changes.

From the O-C the period of the stars over time were also calculated and plotted and can be found here. The diagrams are the same as the link Per under each star, but on a separate page.

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

Capricornus
R Cap
Mean period: 344.88, Mean epoch: 2439002.5    LC  Avg  Per
ΔP: -0.25 ±0.04 (t:6.3, r2:0.234), ΔEpoch: -11.5
ΔP/C: -0 ±0.002 (t:0.2, r2:0)
Mag at max: 10.7 ±0.8 (9.1-12.7)
GCVS period: 345.13, GCVS epoch: 2439014
GCVS spectral type: C(Ne)
E/P (X=15) ε2: 52.4, 2a2: 18.9, r2: 0.964
E/P (X=5) ε2: 52.4, 2a2: -4.5, r2: 0.98

 T Cap
Mean period: 269.81, Mean epoch: 2439303.3    LC  Avg  Per
ΔP: 0.53 ±0.03 (t:15.7, r2:0.593), ΔEpoch: 36.3
ΔP/C: 0.009 ±0.001 (t:11.1, r2:0.425)
Mag at max: 9.5 ±0.4 (8.4-10.7)
GCVS period: 269.28, GCVS epoch: 2439267
GCVS spectral type: M2e-M6e
E/P (X=15) ε2: 34.1, 2a2: -56.8, r2: 0.974
E/P (X=5) ε2: 17.6, 2a2: 3.1, r2: 0.998

 U Cap
Mean period: 203.20, Mean epoch: 2438960.2    LC  Avg  Per
ΔP: 0.06 ±0.02 (t:2.8, r2:0.038), ΔEpoch: -14.8
ΔP/C: -0.002 ±0.001 (t:3.9, r2:0.07)
Mag at max: 11.3 ±0.5 (9.2-12.8)
GCVS period: 203.14, GCVS epoch: 2438975
GCVS spectral type: Me
E/P (X=15) ε2: 25.9, 2a2: -15.7, r2: 0.996
E/P (X=5) ε2: 17.9, 2a2: 7.3, r2: 0.997
V Cap
Mean period: 275.54, Mean epoch: 2440382.6    LC  Avg  Per
ΔP: -0.18 ±0.04 (t:5, r2:0.137), ΔEpoch: -12.4
ΔP/C: -0.007 ±0.001 (t:5.2, r2:0.15)
Mag at max: 9.2 ±0.5 (8.2-10.3)
GCVS period: 275.72, GCVS epoch: 2440395
GCVS spectral type: M5e-M6e
E/P (X=15) ε2: 24.9, 2a2: 7.7, r2: 0.973
E/P (X=5) ε2: 14.9, 2a2: 34.9, r2: 0.821

 W Cap
Mean period: 208.01, Mean epoch: 2438890.8    LC  Avg  Per
ΔP: -1.66 ±0.03 (t:57.3, r2:0.949), ΔEpoch: -57.2
ΔP/C: -0.004 ±0.001 (t:4.6, r2:0.107)
Mag at max: 11.6 ±0.4 (10.2-13.3)
GCVS period: 209.67, GCVS epoch: 2438948
GCVS spectral type: M5e
E/P (X=15) ε2: 31.3, 2a2: -36.6, r2: 0.983
E/P (X=5) ε2: 20.1, 2a2: 5, r2: 0.985

 X Cap
Mean period: 217.94, Mean epoch: 2438967.8    LC  Avg  Per
ΔP: 0 ±0.02 (t:0.3, r2:0), ΔEpoch: -3.2
ΔP/C: -0.005 ±0 (t:14.6, r2:0.556)
Mag at max: 11.2 ±0.4 (10.4-12.2)
GCVS period: 217.94, GCVS epoch: 2438971
GCVS spectral type:
E/P (X=15) ε2: 3.6, 2a2: 29, r2: 0.948
E/P (X=5) ε2: 7.1, 2a2: 18.3, r2: 0.933
Y Cap
Mean period: 410.26, Mean epoch: 2416791.9    LC  Avg  Per
ΔP: -1.5 ±0.18 (t:8.6, r2:0.452), ΔEpoch: 56.9
ΔP/C: -0.041 ±0.009 (t:4.4, r2:0.182)
Mag at max: 11.6 ±0.4 (10.6-12.6)
GCVS period: 411.76, GCVS epoch: 2416735
GCVS spectral type:
E/P (X=15) ε2: 412.6, 2a2: -648.8, r2: 0.988
E/P (X=5) ε2: 296, 2a2: -233.7, r2: 0.98

 Z Cap
Mean period: 181.59, Mean epoch: 2442014.1    LC  Avg  Per
ΔP: 0.11 ±0.01 (t:7.2, r2:0.193), ΔEpoch: -2.9
ΔP/C: -0.003 ±0 (t:9, r2:0.274)
Mag at max: 9.5 ±0.4 (8.6-10.6)
GCVS period: 181.48, GCVS epoch: 2442017
GCVS spectral type: M1e-M4e
E/P (X=15) ε2: 5.9, 2a2: 14.4, r2: 0.961
E/P (X=5) ε2: 3.2, 2a2: 23.1, r2: 0.676

 RR Cap
Mean period: 278.20, Mean epoch: 2439124.9    LC  Avg  Per
ΔP: 0.66 ±0.03 (t:19.2, r2:0.724), ΔEpoch: 28.9
ΔP/C: 0.013 ±0.001 (t:12.7, r2:0.535)
Mag at max: 9.3 ±0.5 (7.8-11.3)
GCVS period: 277.54, GCVS epoch: 2439096
GCVS spectral type: M5e-M6e
E/P (X=15) ε2: 13.8, 2a2: 3.3, r2: 0.978
E/P (X=5) ε2: 7.4, 2a2: 25.7, r2: 0.886
RU Cap
Mean period: 347.89, Mean epoch: 2438897.7    LC  Avg  Per
ΔP: 0.52 ±0.04 (t:12.2, r2:0.567), ΔEpoch: 6.7
ΔP/C: 0.018 ±0.002 (t:10.5, r2:0.494)
Mag at max: 10.2 ±0.6 (9.3-11.8)
GCVS period: 347.37, GCVS epoch: 2438891
GCVS spectral type: M9e
E/P (X=15) ε2: 10.8, 2a2: 65.9, r2: 0.826
E/P (X=5) ε2: 27.5, 2a2: 7.5, r2: 0.987
Carina
R Car
Mean period: 308.11, Mean epoch: 2441969.0    LC  Avg  Per
ΔP: -0.6 ±0.02 (t:24.6, r2:0.781), ΔEpoch: -31
ΔP/C: -0.007 ±0.001 (t:7.3, r2:0.241)
Mag at max: 4.7 ±0.3 (4.1-5.8)
GCVS period: 308.71, GCVS epoch: 2442000
GCVS spectral type: M4e-M8e
E/P (X=15) ε2: 23.2, 2a2: -5.4, r2: 0.996
E/P (X=5) ε2: 19.2, 2a2: 5.4, r2: 0.974

 S Car
Mean period: 149.66, Mean epoch: 2442122.7    LC  Avg  Per
ΔP: 0.17 ±0.01 (t:31.4, r2:0.759), ΔEpoch: 10.7
ΔP/C: 0.001 ±0 (t:8.5, r2:0.19)
Mag at max: 5.8 ±0.3 (5.0-6.6)
GCVS period: 149.49, GCVS epoch: 2442112
GCVS spectral type: K5e-M6e
E/P (X=15) ε2: 3.1, 2a2: 26.8, r2: 0.958
E/P (X=5) ε2: 0.8, 2a2: 33.4, r2: 0.226

 Z Car
Mean period: 384.12, Mean epoch: 2439439.9    LC  Avg  Per
ΔP: 0.11 ±0.06 (t:1.8, r2:0.031), ΔEpoch: -8.1
ΔP/C: 0.017 ±0.003 (t:5.4, r2:0.217)
Mag at max: 10.9 ±0.4 (9.8-12.0)
GCVS period: 384.01, GCVS epoch: 2439448
GCVS spectral type: M6e
E/P (X=15) ε2: 27.2, 2a2: -17, r2: 0.983
E/P (X=5) ε2: 18.1, 2a2: 18.7, r2: 0.988
RV Car
Mean period: 367.45, Mean epoch: 2438984.5    LC  Avg  Per
ΔP: 1.77 ±0.07 (t:25.6, r2:0.849), ΔEpoch: 47.5
ΔP/C: 0.027 ±0.003 (t:8.3, r2:0.373)
Mag at max: 11.4 ±0.6 (10.2-13.0)
GCVS period: 365.68, GCVS epoch: 2438937
GCVS spectral type: M6e
E/P (X=15) ε2: 69.7, 2a2: -91.6, r2: 0.993
E/P (X=5) ε2: 43.5, 2a2: -9.5, r2: 0.982

 RW Car
Mean period: 318.64, Mean epoch: 2438950.2    LC  Avg  Per
ΔP: 0.02 ±0.07 (t:0.3, r2:0.001), ΔEpoch: -40.8
ΔP/C: -0.004 ±0.004 (t:1.2, r2:0.012)
Mag at max: 9.2 ±0.3 (8.3-10.0)
GCVS period: 318.62, GCVS epoch: 2438991
GCVS spectral type: M4e-M7e
E/P (X=15) ε2: 59.7, 2a2: -101.5, r2: 0.984
E/P (X=5) ε2: 33.4, 2a2: -11.3, r2: 0.983

 RY Car
Mean period: 421.30, Mean epoch: 2438754.2    LC  Avg  Per
ΔP: -3 ±0.1 (t:29.7, r2:0.909), ΔEpoch: 10.2
ΔP/C: 0.012 ±0.007 (t:1.7, r2:0.033)
Mag at max: 11.3 ±0.4 (10.6-12.7)
GCVS period: 424.3, GCVS epoch: 2438744
GCVS spectral type: S7,8e
E/P (X=15) ε2: 110.5, 2a2: -134.1, r2: 0.987
E/P (X=5) ε2: 67.4, 2a2: -0.9, r2: 0.999
RZ Car
Mean period: 272.56, Mean epoch: 2439582.4    LC  Avg  Per
ΔP: -0.21 ±0.03 (t:7.1, r2:0.256), ΔEpoch: -3.6
ΔP/C: -0.008 ±0.001 (t:7.4, r2:0.276)
Mag at max: 10.3 ±0.5 (9.2-12.0)
GCVS period: 272.77, GCVS epoch: 2439586
GCVS spectral type: M4e-M8e
E/P (X=15) ε2: 12.2, 2a2: 17.5, r2: 0.977
E/P (X=5) ε2: 11.3, 2a2: 19.2, r2: 0.823

 AF Car
Mean period: 442.52, Mean epoch: 2438240.7    LC  Avg  Per
ΔP: -10.48 ±0.32 (t:32.5, r2:0.944), ΔEpoch: 115.7
ΔP/C: 0.109 ±0.023 (t:4.8, r2:0.271)
Mag at max: 10.3 ±0.4 (9.6-11.0)
GCVS period: 453, GCVS epoch: 2438125
GCVS spectral type: M8e
E/P (X=15) ε2: 366.4, 2a2: -595.1, r2: 0.917
E/P (X=5) ε2: 229.9, 2a2: -150.7, r2: 0.947
Cassiopeia
R Cas
Mean period: 430.80, Mean epoch: 2444496.8    LC  Avg  Per
ΔP: 0.34 ±0.05 (t:6.7, r2:0.249), ΔEpoch: 33.8
ΔP/C: -0.005 ±0.003 (t:2, r2:0.029)
Mag at max: 6.3 ±0.6 (4.7-7.8)
GCVS period: 430.46, GCVS epoch: 2444463
GCVS spectral type: M6e-M10e
E/P (X=15) ε2: 75.8, 2a2: -116.4, r2: 0.987
E/P (X=5) ε2: 45.3, 2a2: -12.2, r2: 0.971

 S Cas
Mean period: 612.65, Mean epoch: 2443848.7    LC  Avg  Per
ΔP: 0.22 ±0.13 (t:1.7, r2:0.032), ΔEpoch: -21.3
ΔP/C: 0.046 ±0.009 (t:5.2, r2:0.227)
Mag at max: 9.2 ±0.9 (7.2-10.9)
GCVS period: 612.43, GCVS epoch: 2443870
GCVS spectral type: S3,4e-S5,8e
E/P (X=15) ε2: 120.9, 2a2: 72.1, r2: 0.986
E/P (X=5) ε2: 86.7, 2a2: 141.4, r2: 0.954

 T Cas
Mean period: 444.51, Mean epoch: 2444101.9    LC  Avg  Per
ΔP: -0.32 ±0.09 (t:3.6, r2:0.095), ΔEpoch: -58.1
ΔP/C: -0.031 ±0.005 (t:6.6, r2:0.264)
Mag at max: 7.8 ±0.3 (6.9-8.5)
GCVS period: 444.83, GCVS epoch: 2444160
GCVS spectral type: M6e-M9e
E/P (X=15) ε2: 124.7, 2a2: -125.1, r2: 0.989
E/P (X=5) ε2: 85.6, 2a2: 18.6, r2: 0.993
U Cas
Mean period: 276.95, Mean epoch: 2444623.9    LC  Avg  Per
ΔP: -0.24 ±0.03 (t:8.1, r2:0.282), ΔEpoch: 2.9
ΔP/C: -0.009 ±0.001 (t:8.1, r2:0.282)
Mag at max: 8.6 ±0.4 (7.7-9.6)
GCVS period: 277.19, GCVS epoch: 2444621
GCVS spectral type: S3,5e-S8,6e
E/P (X=15) ε2: 14.8, 2a2: 5.4, r2: 0.972
E/P (X=5) ε2: 9, 2a2: 28, r2: 0.986

 V Cas
Mean period: 228.86, Mean epoch: 2444577.0    LC  Avg  Per
ΔP: 0.03 ±0.05 (t:0.7, r2:0.002), ΔEpoch: -28
ΔP/C: 0.019 ±0.001 (t:15.6, r2:0.551)
Mag at max: 7.9 ±0.2 (7.4-8.6)
GCVS period: 228.83, GCVS epoch: 2444605
GCVS spectral type: M5e-M8.5e
E/P (X=15) ε2: 44.7, 2a2: -71.1, r2: 0.984
E/P (X=5) ε2: 29.6, 2a2: -12.9, r2: 0.996

 W Cas
Mean period: 405.67, Mean epoch: 2444205.7    LC  Avg  Per
ΔP: 0.1 ±0.05 (t:2.1, r2:0.035), ΔEpoch: -3.3
ΔP/C: -0.003 ±0.003 (t:0.9, r2:0.007)
Mag at max: 8.9 ±0.2 (8.1-9.8)
GCVS period: 405.57, GCVS epoch: 2444209
GCVS spectral type: C7,1e(SC5/9e)
E/P (X=15) ε2: 43.8, 2a2: 19.6, r2: 0.983
E/P (X=5) ε2: 37.4, 2a2: 32.6, r2: 0.953
X Cas
Mean period: 423.77, Mean epoch: 2443925.0    LC  Avg  Per
ΔP: 0.93 ±0.15 (t:6.3, r2:0.274), ΔEpoch: 3
ΔP/C: -0.017 ±0.01 (t:1.6, r2:0.025)
Mag at max: 10.3 ±0.5 (8.8-11.5)
GCVS period: 422.84, GCVS epoch: 2443922
GCVS spectral type: C5,4e(N1e)
E/P (X=15) ε2: 301, 2a2: -432.4, r2: 0.976
E/P (X=5) ε2: 148.2, 2a2: 119.4, r2: 0.985

 Y Cas
Mean period: 413.27, Mean epoch: 2444538.0    LC  Avg  Per
ΔP: -0.21 ±0.09 (t:2.3, r2:0.043), ΔEpoch: 32
ΔP/C: -0.002 ±0.006 (t:0.3, r2:0.001)
Mag at max: 10 ±0.4 (8.7-10.8)
GCVS period: 413.48, GCVS epoch: 2444506
GCVS spectral type: M6e-M8e
E/P (X=15) ε2: 138.6, 2a2: -208.3, r2: 0.991
E/P (X=5) ε2: 86.1, 2a2: -38.1, r2: 0.981

 Z Cas
Mean period: 496.85, Mean epoch: 2442416.1    LC  Avg  Per
ΔP: 1.14 ±0.11 (t:10.3, r2:0.532), ΔEpoch: 40.1
ΔP/C: 0.021 ±0.009 (t:2.4, r2:0.059)
Mag at max: 10.2 ±0.5 (8.6-11.2)
GCVS period: 495.71, GCVS epoch: 2442376
GCVS spectral type: M7e
E/P (X=15) ε2: 168.9, 2a2: -171.2, r2: 0.986
E/P (X=5) ε2: 130.7, 2a2: -75.3, r2: 0.97
RR Cas
Mean period: 299.53, Mean epoch: 2444427.7    LC  Avg  Per
ΔP: -0.54 ±0.08 (t:6.4, r2:0.218), ΔEpoch: -42.3
ΔP/C: -0.03 ±0.004 (t:8.6, r2:0.336)
Mag at max: 10.7 ±0.3 (10.0-11.5)
GCVS period: 300.07, GCVS epoch: 2444470
GCVS spectral type: M5e
E/P (X=15) ε2: 127.3, 2a2: -228.5, r2: 0.978
E/P (X=5) ε2: 79.5, 2a2: -43, r2: 0.986

 RV Cas
Mean period: 332.17, Mean epoch: 2444321.0    LC  Avg  Per
ΔP: 0.49 ±0.05 (t:10.3, r2:0.449), ΔEpoch: 8
ΔP/C: 0.023 ±0.002 (t:11.8, r2:0.518)
Mag at max: 9.4 ±0.5 (7.4-10.7)
GCVS period: 331.68, GCVS epoch: 2444313
GCVS spectral type: M5.5e-M6.5Se
E/P (X=15) ε2: 14.7, 2a2: 24.7, r2: 0.978
E/P (X=5) ε2: 13.5, 2a2: 32.7, r2: 0.942

 SS Cas
Mean period: 139.77, Mean epoch: 2444180.6    LC  Avg  Per
ΔP: -0.8 ±0.01 (t:65.4, r2:0.937), ΔEpoch: -27.4
ΔP/C: -0 ±0 (t:1, r2:0.003)
Mag at max: 9.8 ±0.3 (8.8-10.7)
GCVS period: 140.57, GCVS epoch: 2444208
GCVS spectral type: M3e-M7e
E/P (X=15) ε2: 11.4, 2a2: -15.3, r2: 0.963
E/P (X=5) ε2: 5.3, 2a2: 8, r2: 0.953
TY Cas
Mean period: 626.41, Mean epoch: 2443629.5    LC  Avg  Per
ΔP: -18.59 ±1.82 (t:10.2, r2:0.676), ΔEpoch: 224.5
ΔP/C: 1.37 ±0.098 (t:14, r2:0.801)
Mag at max: 11.3 ±0.4 (10.5-12.2)
GCVS period: 645, GCVS epoch: 2443405
GCVS spectral type: M6
E/P (X=15) ε2: 7538.6, 2a2: -18530.5, r2: 0.959
E/P (X=5) ε2: 3235.6, 2a2: -3382.9, r2: 0.951

 VZ Cas
Mean period: 169.24, Mean epoch: 2444680.2    LC  Avg  Per
ΔP: -0 ±0.01 (t:0.1, r2:0), ΔEpoch: 4.2
ΔP/C: -0.001 ±0 (t:3.3, r2:0.057)
Mag at max: 9.9 ±0.3 (9.4-11.3)
GCVS period: 169.24, GCVS epoch: 2444676
GCVS spectral type: M0e-M3e
E/P (X=15) ε2: 3.9, 2a2: 21.6, r2: 0.942
E/P (X=5) ε2: 1, 2a2: 29.4, r2: 0.387

 WY Cas
Mean period: 477.54, Mean epoch: 2444343.0    LC  Avg  Per
ΔP: 0.98 ±0.11 (t:9.3, r2:0.52), ΔEpoch: 33
ΔP/C: 0.031 ±0.007 (t:4.1, r2:0.174)
Mag at max: 8.9 ±0.4 (8.2-10.2)
GCVS period: 476.56, GCVS epoch: 2444310
GCVS spectral type: S6,5pe+G
E/P (X=15) ε2: 72.8, 2a2: 37.5, r2: 0.984
E/P (X=5) ε2: 43.5, 2a2: 132.1, r2: 0.81
V0666 Cas
Mean period: 424.62, Mean epoch: 2457033.1    LC  Avg  Per
ΔP: 0.62 ±0.54 (t:1.2, r2:0.046), ΔEpoch: 33.1
ΔP/C: -0.592 ±0.083 (t:7.1, r2:0.652)
Mag at max: 11.1 ±0.3 (10.6-12.0)
GCVS period: 424, GCVS epoch: 2457000
GCVS spectral type:
E/P (X=15) ε2: 143.4, 2a2: 17.4, r2: 0.911
E/P (X=5) ε2: 89.6, 2a2: 101.8, r2: 0.928

 V0667 Cas
Mean period: 347.85, Mean epoch: 2457332.3    LC  Avg  Per
ΔP: 0.25 ±0.04 (t:6.3, r2:0.332), ΔEpoch: 3.3
ΔP/C: 0.004 ±0.003 (t:1.5, r2:0.027)
Mag at max: 9.7 ±0.3 (9.1-10.4)
GCVS period: 347.6, GCVS epoch: 2457329
GCVS spectral type:
E/P (X=15) ε2: 10.4, 2a2: 84.8, r2: 0.909
E/P (X=5) ε2: 14.2, 2a2: 67.3, r2: 0.844
Centaurus
R Cen
Mean period: 542.60, Mean epoch: 2441817.4    LC  Avg  Per
ΔP: -3.6 ±0.99 (t:3.6, r2:0.127), ΔEpoch: -124.6
ΔP/C: -0.672 ±0.019 (t:35.8, r2:0.935)
Mag at max: 6.1 ±0.4 (5.1-7.0)
GCVS period: 546.2, GCVS epoch: 2441942
GCVS spectral type: M4e-M9.5
E/P (X=15) ε2: 3375, 2a2: -8631.7, r2: 0.96
E/P (X=5) ε2: 1532.3, 2a2: -1572.5, r2: 0.981

 U Cen
Mean period: 220.10, Mean epoch: 2439929.3    LC  Avg  Per
ΔP: -0.18 ±0.01 (t:12, r2:0.41), ΔEpoch: -11.7
ΔP/C: -0.001 ±0.001 (t:2.8, r2:0.037)
Mag at max: 8.3 ±0.3 (7.6-9.2)
GCVS period: 220.28, GCVS epoch: 2439941
GCVS spectral type: M3II:e-M6.5e
E/P (X=15) ε2: 12, 2a2: -2.4, r2: 0.979
E/P (X=5) ε2: 7.1, 2a2: 15.8, r2: 0.977

 W Cen
Mean period: 201.50, Mean epoch: 2441784.1    LC  Avg  Per
ΔP: -0.07 ±0.01 (t:5.5, r2:0.12), ΔEpoch: -1.9
ΔP/C: -0 ±0 (t:0.8, r2:0.003)
Mag at max: 8.4 ±0.3 (7.6-9.1)
GCVS period: 201.57, GCVS epoch: 2441786
GCVS spectral type: M3e-M8(III)e
E/P (X=15) ε2: 8.1, 2a2: 5.5, r2: 0.996
E/P (X=5) ε2: 7, 2a2: 8.9, r2: 0.989
X Cen
Mean period: 315.87, Mean epoch: 2441729.3    LC  Avg  Per
ΔP: 0.77 ±0.05 (t:14.2, r2:0.592), ΔEpoch: 20.3
ΔP/C: 0.028 ±0.001 (t:22.4, r2:0.785)
Mag at max: 8 ±0.5 (7.0-9.3)
GCVS period: 315.1, GCVS epoch: 2441709
GCVS spectral type: M5e-M8e
E/P (X=15) ε2: 27.5, 2a2: -5.8, r2: 0.996
E/P (X=5) ε2: 23.9, 2a2: 4.5, r2: 1

 RS Cen
Mean period: 164.31, Mean epoch: 2441966.0    LC  Avg  Per
ΔP: -0.06 ±0.01 (t:9.4, r2:0.248), ΔEpoch: -0
ΔP/C: -0 ±0 (t:0.5, r2:0.001)
Mag at max: 8.7 ±0.5 (7.3-10.0)
GCVS period: 164.37, GCVS epoch: 2441966
GCVS spectral type: M2e-M6.5e
E/P (X=15) ε2: 3.9, 2a2: 15.9, r2: 0.986
E/P (X=5) ε2: 3.5, 2a2: 16.4, r2: 0.966

 RT Cen
Mean period: 255.39, Mean epoch: 2442104.1    LC  Avg  Per
ΔP: 0.37 ±0.04 (t:9.2, r2:0.337), ΔEpoch: 6.1
ΔP/C: -0.001 ±0.002 (t:0.4, r2:0.001)
Mag at max: 9.1 ±0.3 (8.1-10.1)
GCVS period: 255.02, GCVS epoch: 2442098
GCVS spectral type: M6e-M9e
E/P (X=15) ε2: 52.2, 2a2: -25.3, r2: 0.984
E/P (X=5) ε2: 35.8, 2a2: 37.3, r2: 0.953
RV Cen
Mean period: 446.17, Mean epoch: 2440985.3    LC  Avg  Per
ΔP: 0.17 ±0.1 (t:1.7, r2:0.027), ΔEpoch: 25.3
ΔP/C: 0.029 ±0.006 (t:4.6, r2:0.167)
Mag at max: 7.7 ±0.3 (7.2-8.4)
GCVS period: 446, GCVS epoch: 2440960
GCVS spectral type: C(N3e)
E/P (X=15) ε2: 79.9, 2a2: 127.2, r2: 0.96
E/P (X=5) ε2: 101.4, 2a2: 17, r2: 0.997

 RX Cen
Mean period: 328.21, Mean epoch: 2442107.8    LC  Avg  Per
ΔP: 0.31 ±0.05 (t:6.7, r2:0.261), ΔEpoch: -6.2
ΔP/C: 0.003 ±0.002 (t:1.3, r2:0.014)
Mag at max: 9.6 ±0.5 (8.7-11.7)
GCVS period: 327.9, GCVS epoch: 2442114
GCVS spectral type: M5e-M8e
E/P (X=15) ε2: 25.5, 2a2: -8.2, r2: 0.96
E/P (X=5) ε2: 16, 2a2: 31.3, r2: 0.964

 BE Cen
Mean period: 200.78, Mean epoch: 2428702.4    LC  Avg  Per
ΔP: -0.78 ±0.03 (t:22.7, r2:0.832), ΔEpoch: -37.6
ΔP/C: -0.005 ±0.001 (t:4.6, r2:0.17)
Mag at max: 9.6 ±0.3 (9.1-10.2)
GCVS period: 201.56, GCVS epoch: 2428740
GCVS spectral type: Me
E/P (X=15) ε2: 44.9, 2a2: -83.1, r2: 0.886
E/P (X=5) ε2: 22.8, 2a2: 2.9, r2: 0.991
Cepheus
S Cep
Mean period: 486.33, Mean epoch: 2443765.2    LC  Avg  Per
ΔP: -0.51 ±0.1 (t:4.9, r2:0.177), ΔEpoch: -21.8
ΔP/C: -0.04 ±0.005 (t:7.5, r2:0.334)
Mag at max: 8.4 ±0.6 (6.8-10.9)
GCVS period: 486.84, GCVS epoch: 2443787
GCVS spectral type: C7,4e(N8e)
E/P (X=15) ε2: 167.1, 2a2: -66.6, r2: 0.989
E/P (X=5) ε2: 128.3, 2a2: 48.4, r2: 0.948

 T Cep
Mean period: 389.56, Mean epoch: 2444252.6    LC  Avg  Per
ΔP: 1.42 ±0.12 (t:11.3, r2:0.492), ΔEpoch: 75.6
ΔP/C: 0.013 ±0.007 (t:1.8, r2:0.023)
Mag at max: 6.1 ±0.2 (5.5-6.6)
GCVS period: 388.14, GCVS epoch: 2444177
GCVS spectral type: M5-M9IIIe
E/P (X=15) ε2: 397.5, 2a2: -917.3, r2: 0.975
E/P (X=5) ε2: 196.1, 2a2: -185.5, r2: 0.97

 X Cep
Mean period: 536.42, Mean epoch: 2443871.2    LC  Avg  Per
ΔP: 1.23 ±0.13 (t:9.7, r2:0.533), ΔEpoch: 37.2
ΔP/C: 0.067 ±0.009 (t:7.4, r2:0.403)
Mag at max: 9.5 ±0.6 (8.1-11.2)
GCVS period: 535.19, GCVS epoch: 2443834
GCVS spectral type: M4e-M7e
E/P (X=15) ε2: 83.1, 2a2: -41.2, r2: 0.996
E/P (X=5) ε2: 64.1, 2a2: 13.2, r2: 0.991
Y Cep
Mean period: 332.70, Mean epoch: 2444136.0    LC  Avg  Per
ΔP: 0.13 ±0.03 (t:4.8, r2:0.151), ΔEpoch: 2
ΔP/C: 0.007 ±0.001 (t:4.4, r2:0.128)
Mag at max: 9.6 ±0.4 (8.6-10.7)
GCVS period: 332.57, GCVS epoch: 2444134
GCVS spectral type: M5e-M6e
E/P (X=15) ε2: 10.9, 2a2: 9.6, r2: 0.979
E/P (X=5) ε2: 5.4, 2a2: 27.1, r2: 0.662

 Z Cep
Mean period: 279.08, Mean epoch: 2442143.9    LC  Avg  Per
ΔP: -0.08 ±0.04 (t:2.1, r2:0.027), ΔEpoch: -12.1
ΔP/C: 0.004 ±0.002 (t:2.1, r2:0.027)
Mag at max: 10.9 ±0.4 (10.2-12.1)
GCVS period: 279.16, GCVS epoch: 2442156
GCVS spectral type: M2e-M7e
E/P (X=15) ε2: 45, 2a2: -63.6, r2: 0.98
E/P (X=5) ε2: 26.1, 2a2: 6, r2: 0.998

 RR Cep
Mean period: 384.26, Mean epoch: 2443603.0    LC  Avg  Per
ΔP: 0.08 ±0.06 (t:1.2, r2:0.012), ΔEpoch: 2
ΔP/C: 0.006 ±0.004 (t:1.3, r2:0.015)
Mag at max: 10.3 ±0.5 (9.3-11.8)
GCVS period: 384.18, GCVS epoch: 2443601
GCVS spectral type: M6e-M8e
E/P (X=15) ε2: 81.3, 2a2: -79.4, r2: 0.991
E/P (X=5) ε2: 60.6, 2a2: -30.8, r2: 0.98
RY Cep
Mean period: 149.44, Mean epoch: 2444564.0    LC  Avg  Per
ΔP: 0.38 ±0.02 (t:20.5, r2:0.649), ΔEpoch: 31
ΔP/C: 0.007 ±0 (t:38.4, r2:0.867)
Mag at max: 9.8 ±0.2 (9.4-10.4)
GCVS period: 149.06, GCVS epoch: 2444533
GCVS spectral type: M0e
E/P (X=15) ε2: 9.9, 2a2: 19, r2: 0.976
E/P (X=5) ε2: 4.7, 2a2: 36, r2: 0.804

 SZ Cep
Mean period: 327.35, Mean epoch: 2442651.8    LC  Avg  Per
ΔP: 0.76 ±0.04 (t:17.2, r2:0.723), ΔEpoch: 27.8
ΔP/C: 0.014 ±0.002 (t:7.7, r2:0.346)
Mag at max: 9.5 ±0.3 (9.0-10.1)
GCVS period: 326.59, GCVS epoch: 2442624
GCVS spectral type: S3.5,8e-S4,8:e
E/P (X=15) ε2: 27.8, 2a2: 5.2, r2: 0.963
E/P (X=5) ε2: 18.5, 2a2: 43.7, r2: 0.979

 AB Cep
Mean period: 323.95, Mean epoch: 2441144.8    LC  Avg  Per
ΔP: -0.55 ±0.09 (t:5.8, r2:0.308), ΔEpoch: -15.2
ΔP/C: 0.027 ±0.005 (t:5.6, r2:0.296)
Mag at max: 11 ±0.3 (10.4-11.8)
GCVS period: 324.5, GCVS epoch: 2441160
GCVS spectral type: M8e
E/P (X=15) ε2: 137.2, 2a2: -289.4, r2: 0.959
E/P (X=5) ε2: 78.7, 2a2: -52.7, r2: 0.957
AX Cep
Mean period: 397.26, Mean epoch: 2437043.4    LC  Avg  Per
ΔP: 2.26 ±0.07 (t:33.5, r2:0.957), ΔEpoch: 20.4
ΔP/C: -0.012 ±0.006 (t:1.9, r2:0.067)
Mag at max: 10.5 ±0.7 (9.4-11.8)
GCVS period: 395, GCVS epoch: 2437023
GCVS spectral type: C(N)
E/P (X=15) ε2: 3.3, 2a2: 158.3, r2: 0.062
E/P (X=5) ε2: 35.9, 2a2: 67.1, r2: 0.663

 BF Cep
Mean period: 429.78, Mean epoch: 2444181.3    LC  Avg  Per
ΔP: -0.36 ±0.17 (t:2.1, r2:0.072), ΔEpoch: -66.7
ΔP/C: 0.003 ±0.014 (t:0.2, r2:0.001)
Mag at max: 10.6 ±0.4 (9.9-11.6)
GCVS period: 430.14, GCVS epoch: 2444248
GCVS spectral type: M7
E/P (X=15) ε2: 278, 2a2: -515, r2: 0.97
E/P (X=5) ε2: 134.7, 2a2: -65.4, r2: 0.967
Cetus
R Cet
Mean period: 166.12, Mean epoch: 2443775.4    LC  Avg  Per
ΔP: -0.12 ±0.01 (t:12.7, r2:0.36), ΔEpoch: 7.4
ΔP/C: -0.001 ±0 (t:4.6, r2:0.07)
Mag at max: 8.2 ±0.4 (7.3-9.8)
GCVS period: 166.24, GCVS epoch: 2443768
GCVS spectral type: M4e-M9
E/P (X=15) ε2: 3.2, 2a2: 18.3, r2: 0.97
E/P (X=5) ε2: 4.2, 2a2: 15.2, r2: 0.919

 S Cet
Mean period: 319.97, Mean epoch: 2442608.0    LC  Avg  Per
ΔP: -0.48 ±0.03 (t:14.5, r2:0.582), ΔEpoch: -42
ΔP/C: 0.001 ±0.001 (t:0.7, r2:0.003)
Mag at max: 8.3 ±0.5 (7.4-10.6)
GCVS period: 320.45, GCVS epoch: 2442650
GCVS spectral type: M3e-M6.5e:
E/P (X=15) ε2: 55, 2a2: -12, r2: 0.97
E/P (X=5) ε2: 46.8, 2a2: 2.9, r2: 0.982

 U Cet
Mean period: 234.58, Mean epoch: 2442137.1    LC  Avg  Per
ΔP: -0.18 ±0.01 (t:12.9, r2:0.466), ΔEpoch: 0.1
ΔP/C: 0.001 ±0 (t:2.6, r2:0.035)
Mag at max: 7.5 ±0.4 (6.8-8.6)
GCVS period: 234.76, GCVS epoch: 2442137
GCVS spectral type: M2e-M6e
E/P (X=15) ε2: 9.9, 2a2: 12.4, r2: 0.983
E/P (X=5) ε2: 6.6, 2a2: 21.8, r2: 0.933
V Cet
Mean period: 260.37, Mean epoch: 2438795.3    LC  Avg  Per
ΔP: 2.55 ±0.03 (t:84.8, r2:0.978), ΔEpoch: 3.3
ΔP/C: 0.011 ±0.001 (t:12.2, r2:0.485)
Mag at max: 9.6 ±0.4 (8.6-10.6)
GCVS period: 257.82, GCVS epoch: 2438792
GCVS spectral type: M3e
E/P (X=15) ε2: 14.7, 2a2: 3.4, r2: 0.997
E/P (X=5) ε2: 12.9, 2a2: 9.9, r2: 0.98

 W Cet
Mean period: 351.02, Mean epoch: 2438571.0    LC  Avg  Per
ΔP: -0.29 ±0.08 (t:3.4, r2:0.083), ΔEpoch: -7
ΔP/C: -0.012 ±0.005 (t:2.4, r2:0.044)
Mag at max: 8.2 ±0.4 (7.5-9.6)
GCVS period: 351.31, GCVS epoch: 2438578
GCVS spectral type: S6,3e-S9,2e
E/P (X=15) ε2: 128.4, 2a2: -161.8, r2: 0.992
E/P (X=5) ε2: 94.4, 2a2: -45.3, r2: 0.992

 X Cet
Mean period: 177.50, Mean epoch: 2441955.6    LC  Avg  Per
ΔP: 0.36 ±0.02 (t:17.7, r2:0.56), ΔEpoch: 2.6
ΔP/C: -0 ±0.001 (t:0, r2:0)
Mag at max: 8.9 ±0.2 (8.0-9.5)
GCVS period: 177.14, GCVS epoch: 2441953
GCVS spectral type: M2e(S)-M6e
E/P (X=15) ε2: 25, 2a2: -19.8, r2: 0.985
E/P (X=5) ε2: 17.7, 2a2: 9.3, r2: 0.971
Z Cet
Mean period: 184.87, Mean epoch: 2441673.5    LC  Avg  Per
ΔP: 0.06 ±0.02 (t:4, r2:0.064), ΔEpoch: -5.5
ΔP/C: -0.004 ±0 (t:9.9, r2:0.302)
Mag at max: 9 ±0.3 (8.4-9.7)
GCVS period: 184.81, GCVS epoch: 2441679
GCVS spectral type: M1e-M6.5e
E/P (X=15) ε2: 14.3, 2a2: -5.1, r2: 0.986
E/P (X=5) ε2: 9.5, 2a2: 11.5, r2: 0.982

 omi Cet
Mean period: 331.88, Mean epoch: 2444800.3    LC  Avg  Per
ΔP: -0.08 ±0.02 (t:3.4, r2:0.043), ΔEpoch: -38.7
ΔP/C: 0.003 ±0 (t:9.9, r2:0.278)
Mag at max: 3.5 ±0.5 (1.9-5.1)
GCVS period: 331.96, GCVS epoch: 2444839
GCVS spectral type: M5e-M9e
E/P (X=15) ε2: 30.6, 2a2: -5.4, r2: 0.989
E/P (X=5) ε2: 24.4, 2a2: 16.5, r2: 0.995
Chamaeleon
R Cha
Mean period: 333.93, Mean epoch: 2441986.5    LC  Avg  Per
ΔP: -0.65 ±0.03 (t:18.9, r2:0.72), ΔEpoch: -19.5
ΔP/C: -0.005 ±0.002 (t:2.5, r2:0.045)
Mag at max: 8.4 ±0.5 (7.5-9.9)
GCVS period: 334.58, GCVS epoch: 2442006
GCVS spectral type: M4e-M8e
E/P (X=15) ε2: 32.7, 2a2: 12.5, r2: 0.969
E/P (X=5) ε2: 31.3, 2a2: 3.6, r2: 0.998
Columba
R Col
Mean period: 327.92, Mean epoch: 2442009.9    LC  Avg  Per
ΔP: 0.3 ±0.03 (t:10.4, r2:0.455), ΔEpoch: -6.1
ΔP/C: -0.003 ±0.002 (t:1.9, r2:0.029)
Mag at max: 8.8 ±0.5 (7.9-10.1)
GCVS period: 327.62, GCVS epoch: 2442016
GCVS spectral type: M3e-M7
E/P (X=15) ε2: 10.4, 2a2: 24, r2: 0.967
E/P (X=5) ε2: 11.9, 2a2: 14.8, r2: 0.989

 S Col
Mean period: 325.82, Mean epoch: 2440568.7    LC  Avg  Per
ΔP: -0.03 ±0.03 (t:0.9, r2:0.006), ΔEpoch: 9.7
ΔP/C: -0.003 ±0.002 (t:1.9, r2:0.027)
Mag at max: 9.3 ±0.5 (7.7-10.5)
GCVS period: 325.85, GCVS epoch: 2440559
GCVS spectral type: M6e-M8
E/P (X=15) ε2: 20.1, 2a2: 1.3, r2: 0.989
E/P (X=5) ε2: 17.8, 2a2: 3.1, r2: 0.979

 T Col
Mean period: 225.98, Mean epoch: 2441968.5    LC  Avg  Per
ΔP: 0.14 ±0.03 (t:4, r2:0.076), ΔEpoch: -4.5
ΔP/C: 0.013 ±0.001 (t:15.5, r2:0.551)
Mag at max: 7.4 ±0.3 (6.7-9.1)
GCVS period: 225.84, GCVS epoch: 2441973
GCVS spectral type: M3e-M6e
E/P (X=15) ε2: 32.7, 2a2: -55.5, r2: 0.964
E/P (X=5) ε2: 19, 2a2: 1.2, r2: 0.98
Coma Berenices
R Com
Mean period: 362.49, Mean epoch: 2443498.0    LC  Avg  Per
ΔP: -0.33 ±0.04 (t:9.3, r2:0.375), ΔEpoch: -41
ΔP/C: -0.002 ±0.002 (t:1.4, r2:0.013)
Mag at max: 8.7 ±0.5 (7.3-10.1)
GCVS period: 362.82, GCVS epoch: 2443539
GCVS spectral type: M5e-M8ep
E/P (X=15) ε2: 25.3, 2a2: 1.8, r2: 0.965
E/P (X=5) ε2: 16.5, 2a2: 37.5, r2: 0.863
Corona Austrina
U CrA
Mean period: 147.56, Mean epoch: 2433191.3    LC  Avg  Per
ΔP: 0.06 ±0.01 (t:7.9, r2:0.322), ΔEpoch: 16.3
ΔP/C: -0 ±0 (t:0.1, r2:0)
Mag at max: 8.7 ±0.4 (8.0-9.5)
GCVS period: 147.5, GCVS epoch: 2433175
GCVS spectral type: M2Ibe
E/P (X=15) ε2: 1.9, 2a2: 55.8, r2: 0.574
E/P (X=5) ε2: 3.2, 2a2: 50.2, r2: 0.294
Corona Borealis
S CrB
Mean period: 360.28, Mean epoch: 2444633.5    LC  Avg  Per
ΔP: 0.02 ±0.04 (t:0.5, r2:0.002), ΔEpoch: 29.5
ΔP/C: -0.007 ±0.002 (t:4.1, r2:0.095)
Mag at max: 7.2 ±0.4 (6.3-8.4)
GCVS period: 360.26, GCVS epoch: 2444604
GCVS spectral type: M6e-M8e
E/P (X=15) ε2: 25.2, 2a2: -7.7, r2: 0.991
E/P (X=5) ε2: 16.1, 2a2: 21.3, r2: 0.941

 V CrB
Mean period: 357.77, Mean epoch: 2443767.7    LC  Avg  Per
ΔP: 0.14 ±0.04 (t:3.3, r2:0.076), ΔEpoch: 4.7
ΔP/C: -0.008 ±0.002 (t:4.2, r2:0.119)
Mag at max: 8 ±0.6 (6.7-9.3)
GCVS period: 357.63, GCVS epoch: 2443763
GCVS spectral type: C6,2e(N2e)
E/P (X=15) ε2: 36.8, 2a2: 31.8, r2: 0.994
E/P (X=5) ε2: 33.6, 2a2: 40.6, r2: 0.991

 W CrB
Mean period: 238.60, Mean epoch: 2444196.5    LC  Avg  Per
ΔP: 0.2 ±0.03 (t:7.6, r2:0.233), ΔEpoch: 4.5
ΔP/C: 0.011 ±0.001 (t:16.9, r2:0.6)
Mag at max: 8.5 ±0.3 (7.8-9.6)
GCVS period: 238.4, GCVS epoch: 2444192
GCVS spectral type: M2e-M5e
E/P (X=15) ε2: 18.4, 2a2: -11.7, r2: 0.988
E/P (X=5) ε2: 11, 2a2: 13.4, r2: 0.968
X CrB
Mean period: 240.93, Mean epoch: 2443695.1    LC  Avg  Per
ΔP: -0.24 ±0.02 (t:10.4, r2:0.368), ΔEpoch: -23.9
ΔP/C: -0.002 ±0.001 (t:2.4, r2:0.031)
Mag at max: 9.2 ±0.3 (8.1-10.0)
GCVS period: 241.17, GCVS epoch: 2443719
GCVS spectral type: M5e-M7e
E/P (X=15) ε2: 20.6, 2a2: -15.8, r2: 0.986
E/P (X=5) ε2: 12.8, 2a2: 12, r2: 0.991

 Z CrB
Mean period: 250.88, Mean epoch: 2442504.1    LC  Avg  Per
ΔP: 0.2 ±0.02 (t:12.4, r2:0.485), ΔEpoch: -9.9
ΔP/C: 0.006 ±0.001 (t:9.9, r2:0.377)
Mag at max: 9.8 ±0.5 (8.8-11.4)
GCVS period: 250.68, GCVS epoch: 2442514
GCVS spectral type: M4e-M5e
E/P (X=15) ε2: 4.9, 2a2: 27, r2: 0.912
E/P (X=5) ε2: 6.5, 2a2: 20.7, r2: 0.778
Corvus
R Crv
Mean period: 317.01, Mean epoch: 2442792.2    LC  Avg  Per
ΔP: -0.02 ±0.05 (t:0.5, r2:0.001), ΔEpoch: 11.2
ΔP/C: 0.013 ±0.002 (t:7.5, r2:0.278)
Mag at max: 7.7 ±0.4 (6.7-9.0)
GCVS period: 317.03, GCVS epoch: 2442781
GCVS spectral type: M4.5e-M9:e
E/P (X=15) ε2: 29.2, 2a2: -17.1, r2: 0.986
E/P (X=5) ε2: 20.7, 2a2: 15.4, r2: 0.982

 U Crv
Mean period: 283.52, Mean epoch: 2438478.3    LC  Avg  Per
ΔP: 0.1 ±0.03 (t:3.3, r2:0.113), ΔEpoch: -1.7
ΔP/C: -0.001 ±0.002 (t:0.6, r2:0.004)
Mag at max: 9.8 ±0.3 (9.3-10.3)
GCVS period: 283.42, GCVS epoch: 2438480
GCVS spectral type: M5e
E/P (X=15) ε2: 19.8, 2a2: 37.3, r2: 0.959
E/P (X=5) ε2: 21.6, 2a2: 23, r2: 0.863

 V Crv
Mean period: 194.03, Mean epoch: 2429364.1    LC  Avg  Per
ΔP: 0.4 ±0.01 (t:26.8, r2:0.865), ΔEpoch: -16.9
ΔP/C: 0.002 ±0.001 (t:3.8, r2:0.115)
Mag at max: 11 ±0.3 (10.5-11.9)
GCVS period: 193.63, GCVS epoch: 2429381
GCVS spectral type: M2e
E/P (X=15) ε2: 5.2, 2a2: 44.6, r2: 0.831
E/P (X=5) ε2: 5.4, 2a2: 42.3, r2: 0.857
Crater
U Crt
Mean period: 168.07, Mean epoch: 2428265.3    LC  Avg  Per
ΔP: -0.93 ±0.01 (t:97.7, r2:0.987), ΔEpoch: -3.7
ΔP/C: 0.001 ±0 (t:2.4, r2:0.045)
Mag at max: 9.8 ±0.3 (9.1-10.6)
GCVS period: 169, GCVS epoch: 2428269
GCVS spectral type: M0e
E/P (X=15) ε2: 5.1, 2a2: 22.6, r2: 0.841
E/P (X=5) ε2: 3.4, 2a2: 29, r2: 0.466
Crux
BH Cru
Mean period: 461.00, Mean epoch: 2441543.9    LC  Avg  Per
ΔP: 40 ±1.79 (t:22.4, r2:0.874), ΔEpoch: 685.9
ΔP/C: 0.951 ±0.072 (t:13.2, r2:0.712)
Mag at max: 7.3 ±0.2 (6.9-8.0)
GCVS period: 421, GCVS epoch: 2440858
GCVS spectral type: SC4.5/8-e-SC7/8-e
E/P (X=15) ε2: 18513.1, 2a2: -44193.3, r2: 0.976
E/P (X=5) ε2: 8486.6, 2a2: -8897.8, r2: 0.964
Cygnus
R Cyg
Mean period: 426.86, Mean epoch: 2444582.4    LC  Avg  Per
ΔP: 0.41 ±0.06 (t:6.9, r2:0.255), ΔEpoch: -12.6
ΔP/C: 0.02 ±0.003 (t:7.3, r2:0.278)
Mag at max: 7.7 ±0.5 (6.7-9.3)
GCVS period: 426.45, GCVS epoch: 2444595
GCVS spectral type: S2.5,9e-S6,9e(Tc)
E/P (X=15) ε2: 55.4, 2a2: 114.2, r2: 0.949
E/P (X=5) ε2: 32.4, 2a2: 187.3, r2: 0.239

 S Cyg
Mean period: 323.25, Mean epoch: 2444125.2    LC  Avg  Per
ΔP: 0.32 ±0.03 (t:11.4, r2:0.424), ΔEpoch: 28.2
ΔP/C: 0.002 ±0.001 (t:1.7, r2:0.016)
Mag at max: 10.2 ±0.4 (9.0-11.2)
GCVS period: 322.93, GCVS epoch: 2444097
GCVS spectral type: S2.5,1e(M3.5-M7e)
E/P (X=15) ε2: 45, 2a2: -14.1, r2: 0.995
E/P (X=5) ε2: 31.3, 2a2: 26.8, r2: 0.988

 U Cyg
Mean period: 465.11, Mean epoch: 2444549.2    LC  Avg  Per
ΔP: 1.87 ±0.11 (t:17.5, r2:0.725), ΔEpoch: -8.8
ΔP/C: 0.018 ±0.007 (t:2.7, r2:0.058)
Mag at max: 7.6 ±0.5 (6.6-9.1)
GCVS period: 463.24, GCVS epoch: 2444558
GCVS spectral type: C7,2e-C9,2(Npe)
E/P (X=15) ε2: 212.5, 2a2: -250.9, r2: 0.995
E/P (X=5) ε2: 152.2, 2a2: -65.5, r2: 0.969
V Cyg
Mean period: 420.98, Mean epoch: 2443987.1    LC  Avg  Per
ΔP: -0.29 ±0.08 (t:3.5, r2:0.094), ΔEpoch: -50.9
ΔP/C: -0.021 ±0.005 (t:4.5, r2:0.148)
Mag at max: 9.3 ±0.7 (7.6-10.9)
GCVS period: 421.27, GCVS epoch: 2444038
GCVS spectral type: C5,3e-C7,4e(Npe)
E/P (X=15) ε2: 64.5, 2a2: 38.4, r2: 0.993
E/P (X=5) ε2: 60.6, 2a2: 44.5, r2: 0.972

 Z Cyg
Mean period: 263.86, Mean epoch: 2444611.1    LC  Avg  Per
ΔP: 0.17 ±0.04 (t:4.3, r2:0.093), ΔEpoch: -6.9
ΔP/C: 0.003 ±0.002 (t:1.8, r2:0.017)
Mag at max: 8.7 ±0.4 (7.7-10.0)
GCVS period: 263.69, GCVS epoch: 2444618
GCVS spectral type: M5e-M9e
E/P (X=15) ε2: 35, 2a2: -2.7, r2: 0.995
E/P (X=5) ε2: 31.1, 2a2: 13.6, r2: 0.994

 RT Cyg
Mean period: 190.26, Mean epoch: 2444585.6    LC  Avg  Per
ΔP: -0.02 ±0.01 (t:2.3, r2:0.021), ΔEpoch: -2.4
ΔP/C: -0.003 ±0 (t:11.8, r2:0.361)
Mag at max: 7.4 ±0.4 (6.4-8.7)
GCVS period: 190.28, GCVS epoch: 2444588
GCVS spectral type: M2e-M8.8eIb
E/P (X=15) ε2: 2.6, 2a2: 22.1, r2: 0.944
E/P (X=5) ε2: 0.4, 2a2: 28.3, r2: 0.181
ST Cyg
Mean period: 337.49, Mean epoch: 2444428.2    LC  Avg  Per
ΔP: 0.2 ±0.09 (t:2.1, r2:0.034), ΔEpoch: -47.8
ΔP/C: 0.001 ±0.005 (t:0.2, r2:0)
Mag at max: 10.1 ±0.3 (8.8-10.8)
GCVS period: 337.29, GCVS epoch: 2444476
GCVS spectral type: M5.5e-M8.0e
E/P (X=15) ε2: 104, 2a2: -219.6, r2: 0.964
E/P (X=5) ε2: 49, 2a2: -12, r2: 0.987

 SX Cyg
Mean period: 411.23, Mean epoch: 2444090.8    LC  Avg  Per
ΔP: 0.21 ±0.04 (t:5.9, r2:0.245), ΔEpoch: 10.8
ΔP/C: -0 ±0.002 (t:0.1, r2:0)
Mag at max: 9.2 ±0.5 (8.1-10.4)
GCVS period: 411.02, GCVS epoch: 2444080
GCVS spectral type: M7e
E/P (X=15) ε2: 18.8, 2a2: 35.5, r2: 0.966
E/P (X=5) ε2: 26.1, 2a2: 7.7, r2: 0.983

 TU Cyg
Mean period: 219.57, Mean epoch: 2444761.8    LC  Avg  Per
ΔP: 0.13 ±0.01 (t:9.6, r2:0.299), ΔEpoch: -3.2
ΔP/C: 0.003 ±0 (t:7.6, r2:0.211)
Mag at max: 9.6 ±0.4 (8.9-10.9)
GCVS period: 219.44, GCVS epoch: 2444765
GCVS spectral type: M3e-M6e
E/P (X=15) ε2: 8.4, 2a2: 9.5, r2: 0.988
E/P (X=5) ε2: 5.1, 2a2: 20.3, r2: 0.988
TW Cyg
Mean period: 342.50, Mean epoch: 2439199.6    LC  Avg  Per
ΔP: 1.64 ±0.11 (t:15.2, r2:0.644), ΔEpoch: 63.6
ΔP/C: 0.049 ±0.005 (t:10.3, r2:0.458)
Mag at max: 10.3 ±0.5 (8.9-12.2)
GCVS period: 340.86, GCVS epoch: 2439136
GCVS spectral type: M6.5-M10ep
E/P (X=15) ε2: 135.4, 2a2: -307, r2: 0.962
E/P (X=5) ε2: 65.1, 2a2: -40.7, r2: 0.977

 TY Cyg
Mean period: 350.53, Mean epoch: 2441948.1    LC  Avg  Per
ΔP: 1.53 ±0.13 (t:11.6, r2:0.521), ΔEpoch: 73.1
ΔP/C: 0.052 ±0.006 (t:8, r2:0.342)
Mag at max: 9.7 ±0.3 (8.6-10.6)
GCVS period: 349, GCVS epoch: 2441875
GCVS spectral type: M6e-M8e
E/P (X=15) ε2: 341, 2a2: -749, r2: 0.983
E/P (X=5) ε2: 177.8, 2a2: -182.9, r2: 0.959

 UX Cyg
Mean period: 567.07, Mean epoch: 2444443.1    LC  Avg  Per
ΔP: 2.07 ±0.27 (t:7.6, r2:0.443), ΔEpoch: 22.1
ΔP/C: 0.188 ±0.014 (t:13.9, r2:0.731)
Mag at max: 10.3 ±0.7 (8.2-11.7)
GCVS period: 565, GCVS epoch: 2444421
GCVS spectral type: M4e-M6.5e
E/P (X=15) ε2: 201.6, 2a2: -49, r2: 0.984
E/P (X=5) ε2: 206.9, 2a2: -127.8, r2: 0.994
WX Cyg
Mean period: 409.32, Mean epoch: 2440461.3    LC  Avg  Per
ΔP: -1.13 ±0.06 (t:17.7, r2:0.766), ΔEpoch: -18.7
ΔP/C: -0.028 ±0.004 (t:7.7, r2:0.383)
Mag at max: 10.1 ±0.2 (9.0-10.5)
GCVS period: 410.45, GCVS epoch: 2440480
GCVS spectral type: C8,2JLi(N3e)
E/P (X=15) ε2: 17.3, 2a2: 108.3, r2: 0.915
E/P (X=5) ε2: 28.1, 2a2: 80.5, r2: 0.726

 WY Cyg
Mean period: 304.69, Mean epoch: 2444822.7    LC  Avg  Per
ΔP: 0.15 ±0.04 (t:4.3, r2:0.127), ΔEpoch: -9.3
ΔP/C: 0.011 ±0.002 (t:6.5, r2:0.248)
Mag at max: 9.3 ±0.3 (8.5-10.0)
GCVS period: 304.54, GCVS epoch: 2444832
GCVS spectral type: M5e-M6e
E/P (X=15) ε2: 42.8, 2a2: -62.6, r2: 0.984
E/P (X=5) ε2: 24.4, 2a2: 1, r2: 0.97

 AU Cyg
Mean period: 434.01, Mean epoch: 2442330.6    LC  Avg  Per
ΔP: -1.3 ±0.09 (t:14.8, r2:0.736), ΔEpoch: 5.6
ΔP/C: -0.005 ±0.007 (t:0.7, r2:0.006)
Mag at max: 10.2 ±0.6 (8.9-11.7)
GCVS period: 435.31, GCVS epoch: 2442325
GCVS spectral type: M6e-M7e
E/P (X=15) ε2: 89.8, 2a2: -101.5, r2: 0.959
E/P (X=5) ε2: 51.1, 2a2: 44.8, r2: 0.928
BG Cyg
Mean period: 288.75, Mean epoch: 2443759.6    LC  Avg  Per
ΔP: 0.75 ±0.09 (t:8.7, r2:0.341), ΔEpoch: -24.4
ΔP/C: -0.031 ±0.003 (t:8.8, r2:0.348)
Mag at max: 9.9 ±0.2 (9.5-10.2)
GCVS period: 288, GCVS epoch: 2443784
GCVS spectral type: M7e-M8e
E/P (X=15) ε2: 121.4, 2a2: -178.5, r2: 0.982
E/P (X=5) ε2: 65.9, 2a2: 15.7, r2: 0.997

 BU Cyg
Mean period: 158.10, Mean epoch: 2433093.5    LC  Avg  Per
ΔP: 0.23 ±0.01 (t:19.4, r2:0.664), ΔEpoch: -2.5
ΔP/C: -0.003 ±0 (t:13.8, r2:0.502)
Mag at max: 10.5 ±0.3 (10.0-11.6)
GCVS period: 157.87, GCVS epoch: 2433096
GCVS spectral type: M0
E/P (X=15) ε2: 8.2, 2a2: 10.8, r2: 0.972
E/P (X=5) ε2: 4, 2a2: 24.8, r2: 0.906

 CM Cyg
Mean period: 254.72, Mean epoch: 2444346.3    LC  Avg  Per
ΔP: -0.11 ±0.03 (t:3.7, r2:0.111), ΔEpoch: -12.7
ΔP/C: 0.001 ±0.001 (t:0.4, r2:0.001)
Mag at max: 10 ±0.3 (9.1-10.8)
GCVS period: 254.83, GCVS epoch: 2444359
GCVS spectral type: SC2-S4e
E/P (X=15) ε2: 36.1, 2a2: -50.1, r2: 0.949
E/P (X=5) ε2: 18, 2a2: 20.2, r2: 0.793
CN Cyg
Mean period: 198.86, Mean epoch: 2444588.1    LC  Avg  Per
ΔP: 0.33 ±0.02 (t:19.9, r2:0.748), ΔEpoch: 11.1
ΔP/C: 0.002 ±0.001 (t:2.9, r2:0.061)
Mag at max: 9.1 ±0.4 (7.5-10.2)
GCVS period: 198.53, GCVS epoch: 2444577
GCVS spectral type: M2-M7e(S)
E/P (X=15) ε2: 3.9, 2a2: 21.7, r2: 0.914
E/P (X=5) ε2: 2.8, 2a2: 26.3, r2: 0.517

 CU Cyg
Mean period: 214.98, Mean epoch: 2437921.5    LC  Avg  Per
ΔP: 1.38 ±0.09 (t:14.9, r2:0.624), ΔEpoch: -36.5
ΔP/C: -0.031 ±0.003 (t:12.1, r2:0.525)
Mag at max: 10.6 ±0.2 (9.8-11.1)
GCVS period: 213.6, GCVS epoch: 2437958
GCVS spectral type: M6e
E/P (X=15) ε2: 79.3, 2a2: -144.4, r2: 0.969
E/P (X=5) ε2: 41.9, 2a2: -2.6, r2: 0.947

 DD Cyg
Mean period: 148.05, Mean epoch: 2444563.0    LC  Avg  Per
ΔP: 0.45 ±0.01 (t:49.1, r2:0.921), ΔEpoch: -5
ΔP/C: -0.002 ±0 (t:12.6, r2:0.435)
Mag at max: 10 ±0.2 (9.6-10.8)
GCVS period: 147.6, GCVS epoch: 2444568
GCVS spectral type: M0e
E/P (X=15) ε2: 4.5, 2a2: 34.9, r2: 0.938
E/P (X=5) ε2: 1.9, 2a2: 43.2, r2: 0.3
DR Cyg
Mean period: 313.35, Mean epoch: 2439413.3    LC  Avg  Per
ΔP: -0.53 ±0.05 (t:9.6, r2:0.452), ΔEpoch: -5.7
ΔP/C: -0.001 ±0.003 (t:0.2, r2:0)
Mag at max: 9.2 ±0.4 (8.3-10.1)
GCVS period: 313.88, GCVS epoch: 2439419
GCVS spectral type: M5e
E/P (X=15) ε2: 42.9, 2a2: 3, r2: 0.989
E/P (X=5) ε2: 34.1, 2a2: 28.2, r2: 0.937

 FF Cyg
Mean period: 324.46, Mean epoch: 2444490.6    LC  Avg  Per
ΔP: 0.64 ±0.06 (t:9.9, r2:0.538), ΔEpoch: 34.6
ΔP/C: 0.014 ±0.003 (t:5.2, r2:0.241)
Mag at max: 9.6 ±0.2 (9.3-10.0)
GCVS period: 323.82, GCVS epoch: 2444456
GCVS spectral type: S6,8e(M4e)
E/P (X=15) ε2: 43.7, 2a2: -62.8, r2: 0.913
E/P (X=5) ε2: 13.2, 2a2: 59.3, r2: 0.58

 LV Cyg
Mean period: 369.06, Mean epoch: 2433355.0    LC  Avg  Per
ΔP: -1.34 ±0.07 (t:18.3, r2:0.816), ΔEpoch: -48
ΔP/C: -0.01 ±0.006 (t:1.7, r2:0.036)
Mag at max: 10.7 ±0.3 (9.9-11.2)
GCVS period: 370.4, GCVS epoch: 2433403
GCVS spectral type: M7
E/P (X=15) ε2: 67.5, 2a2: 6.2, r2: 0.984
E/P (X=5) ε2: 66.4, 2a2: 1.4, r2: 0.978
LX Cyg
Mean period: 480.46, Mean epoch: 2439534.8    LC  Avg  Per
ΔP: 15.16 ±2.47 (t:6.1, r2:0.36), ΔEpoch: 639.8
ΔP/C: 1.692 ±0.075 (t:22.7, r2:0.886)
Mag at max: 10.5 ±0.7 (9.6-12.0)
GCVS period: 465.3, GCVS epoch: 2438895
GCVS spectral type: SC3e-S5,5e:
E/P (X=15) ε2: 37926.7, 2a2: -102854.1, r2: 0.952
E/P (X=5) ε2: 15407.4, 2a2: -18034.9, r2: 0.944

 V0369 Cyg
Mean period: 104.73, Mean epoch: 2444825.7    LC  Avg  Per
ΔP: -0.03 ±0.01 (t:5.2, r2:0.102), ΔEpoch: 26.7
ΔP/C: 0.001 ±0 (t:7.5, r2:0.188)
Mag at max: 10.1 ±0.3 (9.6-10.8)
GCVS period: 104.76, GCVS epoch: 2444799
GCVS spectral type: M4e
E/P (X=15) ε2: 2.4, 2a2: 17.9, r2: 0.69
E/P (X=5) ε2: 1.1, 2a2: 23, r2: 0.232

 V0462 Cyg
Mean period: 372.18, Mean epoch: 2439684.8    LC  Avg  Per
ΔP: 5.5 ±0.13 (t:41, r2:0.941), ΔEpoch: 34.8
ΔP/C: -0.045 ±0.006 (t:7, r2:0.322)
Mag at max: 10 ±0.1 (9.9-10.2)
GCVS period: 366.68, GCVS epoch: 2439650
GCVS spectral type: M7e
E/P (X=15) ε2: 250, 2a2: -500.5, r2: 0.952
E/P (X=5) ε2: 118.6, 2a2: 17.2, r2: 0.972
V1760 Cyg
Mean period: 298.76, Mean epoch: 2436821.3    LC  Avg  Per
ΔP: 0.76 ±0.03 (t:21.7, r2:0.843), ΔEpoch: -8.7
ΔP/C: 0.003 ±0.002 (t:1.9, r2:0.039)
Mag at max: 11 ±0.3 (10.3-11.5)
GCVS period: 298, GCVS epoch: 2436830
GCVS spectral type: M4e
E/P (X=15) ε2: 15.7, 2a2: 13.8, r2: 0.976
E/P (X=5) ε2: 11.7, 2a2: 27.2, r2: 0.912

 chi Cyg
Mean period: 407.26, Mean epoch: 2442114.4    LC  Avg  Per
ΔP: -0.79 ±0.04 (t:18.7, r2:0.632), ΔEpoch: -25.6
ΔP/C: 0.013 ±0 (t:32.1, r2:0.835)
Mag at max: 5 ±0.6 (3.9-7.2)
GCVS period: 408.05, GCVS epoch: 2442140
GCVS spectral type: S6,2e-S10,4e(MSe)
E/P (X=15) ε2: 46.5, 2a2: -12.8, r2: 0.993
E/P (X=5) ε2: 36.3, 2a2: 12.7, r2: 0.973