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

Delphinus
R Del
Mean period: 285.22, Mean epoch: 2444077.3    LC  Avg  Per
ΔP: 0.15 ±0.04 (t:4.1, r2:0.087), ΔEpoch: -13.7
ΔP/C: 0.012 ±0.001 (t:14, r2:0.522)
Mag at max: 8.4 ±0.3 (7.7-9.4)
GCVS period: 285.07, GCVS epoch: 2444091
GCVS spectral type: M5e-M6e
E/P (X=15) ε2: 19.5, 2a2: 9.4, r2: 0.984
E/P (X=5) ε2: 12.8, 2a2: 31, r2: 0.943

 S Del
Mean period: 278.15, Mean epoch: 2444865.2    LC  Avg  Per
ΔP: 0.4 ±0.04 (t:9.2, r2:0.3), ΔEpoch: -21.8
ΔP/C: 0.015 ±0.001 (t:13.1, r2:0.464)
Mag at max: 8.9 ±0.2 (8.2-9.7)
GCVS period: 277.75, GCVS epoch: 2444887
GCVS spectral type: M5e-M8
E/P (X=15) ε2: 43.5, 2a2: 73.3, r2: 0.995
E/P (X=5) ε2: 49.4, 2a2: 57.5, r2: 0.992

 T Del
Mean period: 331.84, Mean epoch: 2443288.5    LC  Avg  Per
ΔP: -0.18 ±0.03 (t:5.4, r2:0.148), ΔEpoch: -7.5
ΔP/C: -0.009 ±0.001 (t:7.8, r2:0.268)
Mag at max: 9.4 ±0.3 (8.5-10.3)
GCVS period: 332.02, GCVS epoch: 2443296
GCVS spectral type: M3e-M6e
E/P (X=15) ε2: 44.2, 2a2: -38.6, r2: 0.997
E/P (X=5) ε2: 34.6, 2a2: -7.9, r2: 0.993
V Del
Mean period: 528.83, Mean epoch: 2440961.1    LC  Avg  Per
ΔP: -4.68 ±0.33 (t:14.1, r2:0.697), ΔEpoch: -103.9
ΔP/C: -0.245 ±0.009 (t:26.1, r2:0.889)
Mag at max: 10.3 ±0.6 (9.0-12.0)
GCVS period: 533.51, GCVS epoch: 2441065
GCVS spectral type: M4e-M6e
E/P (X=15) ε2: 402.8, 2a2: -893.6, r2: 0.959
E/P (X=5) ε2: 187.6, 2a2: -65.4, r2: 0.979

 X Del
Mean period: 281.48, Mean epoch: 2441559.6    LC  Avg  Per
ΔP: 0.44 ±0.03 (t:16.1, r2:0.625), ΔEpoch: 8.6
ΔP/C: 0.009 ±0.001 (t:8.7, r2:0.33)
Mag at max: 9.1 ±0.4 (8.4-10.6)
GCVS period: 281.04, GCVS epoch: 2441551
GCVS spectral type: M4e-M6e
E/P (X=15) ε2: 23.8, 2a2: -4.6, r2: 0.993
E/P (X=5) ε2: 20.9, 2a2: 1.7, r2: 0.986

 Y Del
Mean period: 469.24, Mean epoch: 2442740.2    LC  Avg  Per
ΔP: 0.84 ±0.11 (t:7.4, r2:0.392), ΔEpoch: 33.2
ΔP/C: 0.044 ±0.008 (t:5.5, r2:0.261)
Mag at max: 10.4 ±0.8 (8.8-12.4)
GCVS period: 468.4, GCVS epoch: 2442707
GCVS spectral type: M8e
E/P (X=15) ε2: 89.9, 2a2: 70.4, r2: 0.94
E/P (X=5) ε2: 72.9, 2a2: 72.4, r2: 0.976
Z Del
Mean period: 304.69, Mean epoch: 2442338.2    LC  Avg  Per
ΔP: 0.21 ±0.04 (t:4.9, r2:0.14), ΔEpoch: 21.2
ΔP/C: 0.015 ±0.001 (t:14, r2:0.576)
Mag at max: 9.2 ±0.4 (8.2-10.2)
GCVS period: 304.48, GCVS epoch: 2442317
GCVS spectral type: S5,2.5e-S7,2e:
E/P (X=15) ε2: 27.1, 2a2: -16.2, r2: 0.97
E/P (X=5) ε2: 13.4, 2a2: 34.8, r2: 0.942

 RU Del
Mean period: 260.24, Mean epoch: 2438909.1    LC  Avg  Per
ΔP: -0.34 ±0.04 (t:7.9, r2:0.456), ΔEpoch: 9.1
ΔP/C: -0.01 ±0.002 (t:6, r2:0.325)
Mag at max: 10.8 ±0.2 (10.4-11.2)
GCVS period: 260.58, GCVS epoch: 2438900
GCVS spectral type: M3
E/P (X=15) ε2: 15.2, 2a2: 17.3, r2: 0.969
E/P (X=5) ε2: 17.4, 2a2: 13.6, r2: 0.926

 RX Del
Mean period: 185.44, Mean epoch: 2442293.0    LC  Avg  Per
ΔP: -0.19 ±0.02 (t:8.9, r2:0.42), ΔEpoch: -27
ΔP/C: 0.002 ±0.001 (t:2.5, r2:0.055)
Mag at max: 10.9 ±0.3 (10.4-11.7)
GCVS period: 185.63, GCVS epoch: 2442320
GCVS spectral type: M2e
E/P (X=15) ε2: 12.7, 2a2: 15.7, r2: 0.935
E/P (X=5) ε2: 15.8, 2a2: 7.6, r2: 0.955
SS Del
Mean period: 194.37, Mean epoch: 2436524.3    LC  Avg  Per
ΔP: -0.22 ±0.04 (t:5.8, r2:0.296), ΔEpoch: 3.3
ΔP/C: -0.012 ±0.001 (t:14.4, r2:0.725)
Mag at max: 11.8 ±0.3 (11.2-12.6)
GCVS period: 194.59, GCVS epoch: 2436521
GCVS spectral type:
E/P (X=15) ε2: 9, 2a2: 11.8, r2: 0.967
E/P (X=5) ε2: 6.3, 2a2: 21.3, r2: 0.842
Dorado
SU Dor
Mean period: 235.76, Mean epoch: 2440742.6    LC  Avg  Per
ΔP: -0.1 ±0.03 (t:3.2, r2:0.098), ΔEpoch: 1.6
ΔP/C: 0.005 ±0.002 (t:2.1, r2:0.047)
Mag at max: 9.4 ±0.4 (8.7-10.6)
GCVS period: 235.86, GCVS epoch: 2440741
GCVS spectral type:
E/P (X=15) ε2: 6.7, 2a2: 24, r2: 0.971
E/P (X=5) ε2: 5.1, 2a2: 28.8, r2: 0.61
Draco
R Dra
Mean period: 245.75, Mean epoch: 2444786.5    LC  Avg  Per
ΔP: 0.15 ±0.02 (t:6.2, r2:0.152), ΔEpoch: 7.5
ΔP/C: 0.011 ±0 (t:21.7, r2:0.688)
Mag at max: 7.6 ±0.3 (6.8-9.0)
GCVS period: 245.6, GCVS epoch: 2444779
GCVS spectral type: M5e-M9eIII
E/P (X=15) ε2: 14.8, 2a2: -9.6, r2: 0.986
E/P (X=5) ε2: 9.8, 2a2: 9.1, r2: 0.988

 T Dra
Mean period: 421.91, Mean epoch: 2443967.8    LC  Avg  Per
ΔP: 0.29 ±0.09 (t:3.4, r2:0.095), ΔEpoch: 10.8
ΔP/C: 0.036 ±0.005 (t:7.1, r2:0.321)
Mag at max: 9.9 ±0.5 (8.6-11.0)
GCVS period: 421.62, GCVS epoch: 2443957
GCVS spectral type: C6,2e-C8,3e(N0e)
E/P (X=15) ε2: 72.7, 2a2: 25.2, r2: 0.965
E/P (X=5) ε2: 59.2, 2a2: 101.9, r2: 0.969

 U Dra
Mean period: 317.69, Mean epoch: 2444395.9    LC  Avg  Per
ΔP: 1.56 ±0.11 (t:14.2, r2:0.589), ΔEpoch: 105.9
ΔP/C: 0.041 ±0.005 (t:8.8, r2:0.357)
Mag at max: 9.7 ±0.2 (9.0-10.4)
GCVS period: 316.13, GCVS epoch: 2444290
GCVS spectral type: M6e-M8
E/P (X=15) ε2: 221.6, 2a2: -517.8, r2: 0.969
E/P (X=5) ε2: 102.9, 2a2: -78, r2: 0.986
V Dra
Mean period: 278.57, Mean epoch: 2444460.4    LC  Avg  Per
ΔP: 0.24 ±0.04 (t:6.8, r2:0.226), ΔEpoch: 9.4
ΔP/C: 0.012 ±0.001 (t:8.7, r2:0.321)
Mag at max: 10 ±0.2 (9.2-10.6)
GCVS period: 278.33, GCVS epoch: 2444451
GCVS spectral type: M4e
E/P (X=15) ε2: 24.1, 2a2: 15.8, r2: 0.998
E/P (X=5) ε2: 22.6, 2a2: 21.3, r2: 0.992

 W Dra
Mean period: 271.32, Mean epoch: 2442414.2    LC  Avg  Per
ΔP: -7.28 ±0.39 (t:18.8, r2:0.686), ΔEpoch: 238.2
ΔP/C: 0.228 ±0.002 (t:132, r2:0.991)
Mag at max: 9.8 ±0.4 (8.9-11.3)
GCVS period: 278.6, GCVS epoch: 2442176
GCVS spectral type: M3e-M4e
E/P (X=15) ε2: 1224.7, 2a2: -3247.8, r2: 0.956
E/P (X=5) ε2: 507.1, 2a2: -535.2, r2: 0.968

 X Dra
Mean period: 257.47, Mean epoch: 2444177.7    LC  Avg  Per
ΔP: 0.14 ±0.02 (t:7, r2:0.233), ΔEpoch: 10.7
ΔP/C: 0.004 ±0.001 (t:5, r2:0.136)
Mag at max: 11.1 ±0.3 (10.0-12.0)
GCVS period: 257.33, GCVS epoch: 2444167
GCVS spectral type: M5e:
E/P (X=15) ε2: 12.7, 2a2: 13.5, r2: 0.988
E/P (X=5) ε2: 10.1, 2a2: 19.9, r2: 0.97
Y Dra
Mean period: 325.92, Mean epoch: 2444488.2    LC  Avg  Per
ΔP: 0.13 ±0.04 (t:3.4, r2:0.076), ΔEpoch: 40.2
ΔP/C: 0.004 ±0.002 (t:1.8, r2:0.023)
Mag at max: 9 ±0.5 (8.2-10.7)
GCVS period: 325.79, GCVS epoch: 2444448
GCVS spectral type: M5e
E/P (X=15) ε2: 43.2, 2a2: -37, r2: 0.992
E/P (X=5) ε2: 32.5, 2a2: -8.9, r2: 0.974

 RT Dra
Mean period: 278.73, Mean epoch: 2435467.8    LC  Avg  Per
ΔP: -0.68 ±0.06 (t:10.9, r2:0.49), ΔEpoch: -26.2
ΔP/C: -0.015 ±0.003 (t:4.8, r2:0.159)
Mag at max: 9.9 ±0.2 (9.2-10.6)
GCVS period: 279.41, GCVS epoch: 2435494
GCVS spectral type: M5
E/P (X=15) ε2: 122.4, 2a2: -291.4, r2: 0.961
E/P (X=5) ε2: 52.1, 2a2: -25.5, r2: 0.984

 RV Dra
Mean period: 208.58, Mean epoch: 2443533.5    LC  Avg  Per
ΔP: 0.44 ±0.03 (t:17.2, r2:0.65), ΔEpoch: 7.5
ΔP/C: 0.008 ±0.001 (t:11, r2:0.43)
Mag at max: 10 ±0.5 (9.0-11.2)
GCVS period: 208.14, GCVS epoch: 2443526
GCVS spectral type: M1e-M3e
E/P (X=15) ε2: 9.6, 2a2: 32.7, r2: 0.943
E/P (X=5) ε2: 3.5, 2a2: 51.9, r2: 0.327
SV Dra
Mean period: 256.27, Mean epoch: 2443735.6    LC  Avg  Per
ΔP: 0.03 ±0.03 (t:1.1, r2:0.007), ΔEpoch: 21.6
ΔP/C: -0.001 ±0.001 (t:0.9, r2:0.005)
Mag at max: 9.7 ±0.3 (8.6-10.6)
GCVS period: 256.24, GCVS epoch: 2443714
GCVS spectral type: M7e
E/P (X=15) ε2: 19.3, 2a2: -14.9, r2: 0.992
E/P (X=5) ε2: 13.8, 2a2: 4.1, r2: 0.981

 ZZ Dra
Mean period: 269.64, Mean epoch: 2441187.0    LC  Avg  Per
ΔP: 1.74 ±0.07 (t:24.9, r2:0.854), ΔEpoch: -22
ΔP/C: -0.02 ±0.003 (t:6.6, r2:0.296)
Mag at max: 9.6 ±0.3 (8.9-10.4)
GCVS period: 267.9, GCVS epoch: 2441209
GCVS spectral type: M7e
E/P (X=15) ε2: 92.5, 2a2: -202.3, r2: 0.922
E/P (X=5) ε2: 37.8, 2a2: 22.3, r2: 0.963
Equuleus
R Equ
Mean period: 260.56, Mean epoch: 2442927.8    LC  Avg  Per
ΔP: -0.2 ±0.03 (t:6.9, r2:0.227), ΔEpoch: 6.8
ΔP/C: 0.008 ±0.001 (t:6.9, r2:0.228)
Mag at max: 9.4 ±0.4 (8.4-10.7)
GCVS period: 260.76, GCVS epoch: 2442921
GCVS spectral type: M3e-M4e
E/P (X=15) ε2: 17.9, 2a2: -2.6, r2: 0.982
E/P (X=5) ε2: 13.2, 2a2: 16.6, r2: 0.92

 RR Equ
Mean period: 270.98, Mean epoch: 2443709.3    LC  Avg  Per
ΔP: -0.32 ±0.06 (t:5.8, r2:0.369), ΔEpoch: -6.7
ΔP/C: 0.001 ±0.003 (t:0.3, r2:0.001)
Mag at max: 10.1 ±0.4 (9.4-11.2)
GCVS period: 271.3, GCVS epoch: 2443716
GCVS spectral type:
E/P (X=15) ε2: 14.6, 2a2: 26.5, r2: 0.82
E/P (X=5) ε2: 10.6, 2a2: 52.3, r2: 0.341
Eridanus
T Eri
Mean period: 252.53, Mean epoch: 2442097.8    LC  Avg  Per
ΔP: 0.24 ±0.04 (t:6.4, r2:0.204), ΔEpoch: 18.8
ΔP/C: 0.003 ±0.001 (t:2, r2:0.025)
Mag at max: 8.1 ±0.4 (7.3-9.9)
GCVS period: 252.29, GCVS epoch: 2442079
GCVS spectral type: M3e-M5e
E/P (X=15) ε2: 35.9, 2a2: -49, r2: 0.973
E/P (X=5) ε2: 21, 2a2: 8.8, r2: 0.988

 U Eri
Mean period: 274.36, Mean epoch: 2440100.7    LC  Avg  Per
ΔP: -0.55 ±0.03 (t:18.5, r2:0.716), ΔEpoch: -9.3
ΔP/C: -0.001 ±0.001 (t:0.6, r2:0.003)
Mag at max: 9.5 ±0.4 (8.5-10.8)
GCVS period: 274.91, GCVS epoch: 2440110
GCVS spectral type: M4e
E/P (X=15) ε2: 12.5, 2a2: 18.4, r2: 0.986
E/P (X=5) ε2: 11.3, 2a2: 19.2, r2: 0.964

 W Eri
Mean period: 376.10, Mean epoch: 2440314.6    LC  Avg  Per
ΔP: -0.53 ±0.09 (t:5.8, r2:0.249), ΔEpoch: -30.4
ΔP/C: -0.015 ±0.005 (t:2.8, r2:0.074)
Mag at max: 8.7 ±0.6 (7.8-11.3)
GCVS period: 376.63, GCVS epoch: 2440345
GCVS spectral type: M7e-M9
E/P (X=15) ε2: 108.6, 2a2: -198.5, r2: 0.985
E/P (X=5) ε2: 61, 2a2: -32.3, r2: 0.952
Fornax
R For
Mean period: 388.35, Mean epoch: 2441941.5    LC  Avg  Per
ΔP: -0.38 ±0.07 (t:5.6, r2:0.233), ΔEpoch: -32.5
ΔP/C: -0.001 ±0.004 (t:0.3, r2:0.001)
Mag at max: 9.4 ±0.7 (8.0-11.4)
GCVS period: 388.73, GCVS epoch: 2441974
GCVS spectral type: C4,3e(Ne)
E/P (X=15) ε2: 26.3, 2a2: 121.3, r2: 0.971
E/P (X=5) ε2: 15.4, 2a2: 159, r2: 0.702
Gemini
R Gem
Mean period: 369.97, Mean epoch: 2443339.6    LC  Avg  Per
ΔP: 0.06 ±0.03 (t:1.7, r2:0.02), ΔEpoch: 14.6
ΔP/C: 0.009 ±0.001 (t:6.8, r2:0.242)
Mag at max: 7.1 ±0.4 (6.4-8.5)
GCVS period: 369.91, GCVS epoch: 2443325
GCVS spectral type: S2,9e-S8,9e(Tc)
E/P (X=15) ε2: 17, 2a2: 115.2, r2: 0.901
E/P (X=5) ε2: 6.7, 2a2: 143.6, r2: 0.109

 S Gem
Mean period: 292.96, Mean epoch: 2443580.1    LC  Avg  Per
ΔP: -0.27 ±0.03 (t:9.9, r2:0.35), ΔEpoch: 2.1
ΔP/C: -0.009 ±0.001 (t:13.1, r2:0.488)
Mag at max: 9.1 ±0.4 (8.2-10.3)
GCVS period: 293.23, GCVS epoch: 2443578
GCVS spectral type: M4e-M8e
E/P (X=15) ε2: 23, 2a2: -7.4, r2: 0.98
E/P (X=5) ε2: 13.1, 2a2: 26.4, r2: 0.93

 T Gem
Mean period: 287.59, Mean epoch: 2444693.9    LC  Avg  Per
ΔP: -0.2 ±0.02 (t:8.8, r2:0.295), ΔEpoch: -16.1
ΔP/C: 0.001 ±0.001 (t:1.7, r2:0.015)
Mag at max: 8.7 ±0.2 (8.1-9.3)
GCVS period: 287.79, GCVS epoch: 2444710
GCVS spectral type: S1.5,5e-S9,5e
E/P (X=15) ε2: 37.7, 2a2: 6.9, r2: 0.988
E/P (X=5) ε2: 38.7, 2a2: 11.9, r2: 0.994
V Gem
Mean period: 275.04, Mean epoch: 2442700.4    LC  Avg  Per
ΔP: 0.24 ±0.03 (t:7.4, r2:0.245), ΔEpoch: 6.4
ΔP/C: 0.001 ±0.001 (t:0.8, r2:0.004)
Mag at max: 8.5 ±0.4 (7.5-9.8)
GCVS period: 274.8, GCVS epoch: 2442694
GCVS spectral type: M4(S)e-M8
E/P (X=15) ε2: 54, 2a2: -54.9, r2: 0.991
E/P (X=5) ε2: 37.1, 2a2: 3.3, r2: 0.997

 X Gem
Mean period: 264.06, Mean epoch: 2443513.5    LC  Avg  Per
ΔP: -0.1 ±0.04 (t:2.8, r2:0.043), ΔEpoch: -39.5
ΔP/C: -0.001 ±0.002 (t:0.8, r2:0.004)
Mag at max: 8.4 ±0.3 (7.5-9.6)
GCVS period: 264.16, GCVS epoch: 2443553
GCVS spectral type: M5e-M8e(Tc:)
E/P (X=15) ε2: 34.9, 2a2: -16.6, r2: 0.996
E/P (X=5) ε2: 27.5, 2a2: 8.7, r2: 0.988

 ST Gem
Mean period: 245.92, Mean epoch: 2443828.2    LC  Avg  Per
ΔP: -0.31 ±0.03 (t:10.8, r2:0.466), ΔEpoch: -25.8
ΔP/C: -0.001 ±0.001 (t:0.9, r2:0.006)
Mag at max: 9.4 ±0.3 (8.8-10.3)
GCVS period: 246.23, GCVS epoch: 2443854
GCVS spectral type: M5e-M9e
E/P (X=15) ε2: 27.8, 2a2: -39, r2: 0.957
E/P (X=5) ε2: 16.3, 2a2: 3.9, r2: 0.971
VV Gem
Mean period: 252.76, Mean epoch: 2435521.4    LC  Avg  Per
ΔP: -0.14 ±0.02 (t:8.5, r2:0.449), ΔEpoch: 1.4
ΔP/C: 0.002 ±0.001 (t:2.8, r2:0.082)
Mag at max: 10.7 ±0.3 (10.2-11.3)
GCVS period: 252.9, GCVS epoch: 2435520
GCVS spectral type:
E/P (X=15) ε2: 3.8, 2a2: 34.1, r2: 0.604
E/P (X=5) ε2: 6.3, 2a2: 24.7, r2: 0.56

 WZ Gem
Mean period: 332.23, Mean epoch: 2438067.5    LC  Avg  Per
ΔP: 1.43 ±0.06 (t:23.5, r2:0.852), ΔEpoch: 19.5
ΔP/C: 0.008 ±0.003 (t:2.3, r2:0.054)
Mag at max: 10 ±0.3 (9.4-10.8)
GCVS period: 330.8, GCVS epoch: 2438048
GCVS spectral type: M3e
E/P (X=15) ε2: 61.2, 2a2: -102.6, r2: 0.962
E/P (X=5) ε2: 28.1, 2a2: 19.6, r2: 0.99

 ZZ Gem
Mean period: 316.07, Mean epoch: 2433977.8    LC  Avg  Per
ΔP: -0.93 ±0.06 (t:15.9, r2:0.762), ΔEpoch: -21.2
ΔP/C: -0.016 ±0.003 (t:5.9, r2:0.309)
Mag at max: 9.1 ±0.2 (8.7-9.6)
GCVS period: 317, GCVS epoch: 2433999
GCVS spectral type: C5,3e(Ne)
E/P (X=15) ε2: 54.9, 2a2: 76.6, r2: 0.963
E/P (X=5) ε2: 70, 2a2: 43.7, r2: 0.974
BP Gem
Mean period: 244.48, Mean epoch: 2443921.4    LC  Avg  Per
ΔP: -2.02 ±0.03 (t:73.9, r2:0.982), ΔEpoch: -33.6
ΔP/C: 0.002 ±0.001 (t:2.1, r2:0.042)
Mag at max: 10.5 ±0.4 (9.9-11.1)
GCVS period: 246.5, GCVS epoch: 2443955
GCVS spectral type: M8e
E/P (X=15) ε2: 12.8, 2a2: 18.5, r2: 0.896
E/P (X=5) ε2: 14.6, 2a2: 16.4, r2: 0.69

 BR Gem
Mean period: 155.67, Mean epoch: 2439888.4    LC  Avg  Per
ΔP: -0.13 ±0.02 (t:7.3, r2:0.402), ΔEpoch: -20.6
ΔP/C: -0.002 ±0 (t:4.3, r2:0.192)
Mag at max: 11.6 ±0.4 (10.9-12.5)
GCVS period: 155.8, GCVS epoch: 2439909
GCVS spectral type:
E/P (X=15) ε2: 2.6, 2a2: 19.2, r2: 0.667
E/P (X=5) ε2: 1.8, 2a2: 24.9, r2: 0.325
Grus
R Gru
Mean period: 332.67, Mean epoch: 2440993.7    LC  Avg  Per
ΔP: 0.71 ±0.04 (t:16.6, r2:0.684), ΔEpoch: 36.7
ΔP/C: 0.011 ±0.002 (t:5.4, r2:0.19)
Mag at max: 8.1 ±0.5 (6.9-9.5)
GCVS period: 331.96, GCVS epoch: 2440957
GCVS spectral type: M5e-M7II-IIIe
E/P (X=15) ε2: 35.3, 2a2: -13.5, r2: 0.992
E/P (X=5) ε2: 24.3, 2a2: 16.1, r2: 0.971

 S Gru
Mean period: 400.95, Mean epoch: 2440590.1    LC  Avg  Per
ΔP: -0.56 ±0.06 (t:9.3, r2:0.45), ΔEpoch: -17.9
ΔP/C: -0.007 ±0.004 (t:2, r2:0.037)
Mag at max: 7.6 ±0.6 (6.3-9.6)
GCVS period: 401.51, GCVS epoch: 2440608
GCVS spectral type: M5e-M8IIIe
E/P (X=15) ε2: 54.7, 2a2: -14.1, r2: 0.985
E/P (X=5) ε2: 44.7, 2a2: 0.5, r2: 0.962

 T Gru
Mean period: 136.72, Mean epoch: 2442082.8    LC  Avg  Per
ΔP: 0.23 ±0.01 (t:24.6, r2:0.684), ΔEpoch: 10.8
ΔP/C: 0.002 ±0 (t:14.3, r2:0.423)
Mag at max: 8.6 ±0.3 (7.4-9.5)
GCVS period: 136.49, GCVS epoch: 2442072
GCVS spectral type: M1Iae-M2Ibe
E/P (X=15) ε2: 2.8, 2a2: 31.8, r2: 0.968
E/P (X=5) ε2: 3.3, 2a2: 29.5, r2: 0.797
Hercules
R Her
Mean period: 318.12, Mean epoch: 2445079.7    LC  Avg  Per
ΔP: -0.02 ±0.04 (t:0.6, r2:0.002), ΔEpoch: 21.7
ΔP/C: -0.01 ±0.001 (t:9.3, r2:0.332)
Mag at max: 8.9 ±0.4 (8.0-10.5)
GCVS period: 318.14, GCVS epoch: 2445058
GCVS spectral type: M6e
E/P (X=15) ε2: 31.2, 2a2: -20.2, r2: 0.982
E/P (X=5) ε2: 18.1, 2a2: 25.8, r2: 0.997

 S Her
Mean period: 307.64, Mean epoch: 2445034.8    LC  Avg  Per
ΔP: 0.36 ±0.06 (t:5.9, r2:0.154), ΔEpoch: -19.2
ΔP/C: 0.001 ±0.002 (t:0.4, r2:0.001)
Mag at max: 7.5 ±0.3 (6.6-8.5)
GCVS period: 307.28, GCVS epoch: 2445054
GCVS spectral type: M4,Se-M7.5,Se
E/P (X=15) ε2: 140.9, 2a2: -302.9, r2: 0.976
E/P (X=5) ε2: 69.2, 2a2: -44.6, r2: 0.984

 T Her
Mean period: 164.92, Mean epoch: 2445298.9    LC  Avg  Per
ΔP: -0.06 ±0.01 (t:10.2, r2:0.235), ΔEpoch: -7.1
ΔP/C: -0.002 ±0 (t:18.1, r2:0.491)
Mag at max: 7.9 ±0.4 (7.0-9.3)
GCVS period: 164.98, GCVS epoch: 2445306
GCVS spectral type: M2.5e-M8e
E/P (X=15) ε2: 3.9, 2a2: 10.8, r2: 0.985
E/P (X=5) ε2: 2.2, 2a2: 15.6, r2: 0.839
U Her
Mean period: 405.77, Mean epoch: 2444983.8    LC  Avg  Per
ΔP: -0.33 ±0.06 (t:5.9, r2:0.197), ΔEpoch: -10.2
ΔP/C: 0.007 ±0.003 (t:2.5, r2:0.044)
Mag at max: 7.7 ±0.4 (6.9-8.8)
GCVS period: 406.1, GCVS epoch: 2444994
GCVS spectral type: M6.5e-M9.5e
E/P (X=15) ε2: 87.4, 2a2: -96.2, r2: 0.994
E/P (X=5) ε2: 66.8, 2a2: -41.8, r2: 0.964

 W Her
Mean period: 279.95, Mean epoch: 2445044.1    LC  Avg  Per
ΔP: -0.08 ±0.03 (t:2.4, r2:0.031), ΔEpoch: -14.9
ΔP/C: 0.002 ±0.001 (t:1.3, r2:0.009)
Mag at max: 8.3 ±0.3 (7.3-9.4)
GCVS period: 280.03, GCVS epoch: 2445059
GCVS spectral type: M3e-M5e
E/P (X=15) ε2: 50.5, 2a2: -63.2, r2: 0.993
E/P (X=5) ε2: 33.4, 2a2: -8.2, r2: 0.987

 RS Her
Mean period: 219.47, Mean epoch: 2445160.9    LC  Avg  Per
ΔP: -0.23 ±0.02 (t:10.6, r2:0.355), ΔEpoch: -33.1
ΔP/C: -0.001 ±0.001 (t:1.4, r2:0.01)
Mag at max: 8 ±0.2 (7.6-8.7)
GCVS period: 219.7, GCVS epoch: 2445194
GCVS spectral type: M4e-M8:
E/P (X=15) ε2: 20.1, 2a2: -20.1, r2: 0.968
E/P (X=5) ε2: 10.7, 2a2: 16.3, r2: 0.984
RT Her
Mean period: 297.79, Mean epoch: 2445094.7    LC  Avg  Per
ΔP: -0.29 ±0.04 (t:7.1, r2:0.252), ΔEpoch: -9.3
ΔP/C: -0.003 ±0.002 (t:1.5, r2:0.015)
Mag at max: 9.8 ±0.5 (8.5-11.0)
GCVS period: 298.08, GCVS epoch: 2445104
GCVS spectral type: M4e
E/P (X=15) ε2: 38.9, 2a2: -25.4, r2: 0.993
E/P (X=5) ε2: 31.2, 2a2: 4.4, r2: 0.984

 RU Her
Mean period: 486.01, Mean epoch: 2444933.2    LC  Avg  Per
ΔP: 1.18 ±0.13 (t:9.1, r2:0.471), ΔEpoch: 34.2
ΔP/C: 0.011 ±0.01 (t:1.1, r2:0.012)
Mag at max: 8.1 ±0.5 (7.2-9.5)
GCVS period: 484.83, GCVS epoch: 2444899
GCVS spectral type: M6e-M9
E/P (X=15) ε2: 215.3, 2a2: -115.2, r2: 0.941
E/P (X=5) ε2: 193.4, 2a2: -170.3, r2: 0.968

 RV Her
Mean period: 205.53, Mean epoch: 2445163.0    LC  Avg  Per
ΔP: 0.3 ±0.02 (t:19.7, r2:0.641), ΔEpoch: 20
ΔP/C: 0.006 ±0 (t:15.8, r2:0.536)
Mag at max: 10.2 ±0.5 (9.0-11.4)
GCVS period: 205.23, GCVS epoch: 2445143
GCVS spectral type: M2e
E/P (X=15) ε2: 7.7, 2a2: 15.2, r2: 0.979
E/P (X=5) ε2: 4, 2a2: 27, r2: 0.736
RY Her
Mean period: 221.41, Mean epoch: 2445203.3    LC  Avg  Per
ΔP: -0.06 ±0.02 (t:3, r2:0.043), ΔEpoch: -7.7
ΔP/C: 0.001 ±0.001 (t:1.7, r2:0.014)
Mag at max: 9 ±0.3 (8.3-10.0)
GCVS period: 221.47, GCVS epoch: 2445211
GCVS spectral type: M4e-M6e
E/P (X=15) ε2: 17.3, 2a2: -12.4, r2: 0.981
E/P (X=5) ε2: 11, 2a2: 10.8, r2: 0.997

 RZ Her
Mean period: 328.70, Mean epoch: 2445143.6    LC  Avg  Per
ΔP: -0.35 ±0.05 (t:6.8, r2:0.269), ΔEpoch: 0.6
ΔP/C: -0.024 ±0.002 (t:13, r2:0.573)
Mag at max: 9.6 ±0.4 (8.9-10.9)
GCVS period: 329.05, GCVS epoch: 2445143
GCVS spectral type: M5e-M6e
E/P (X=15) ε2: 32.6, 2a2: -32, r2: 0.983
E/P (X=5) ε2: 19.1, 2a2: 16.7, r2: 0.985

 SS Her
Mean period: 106.91, Mean epoch: 2445228.3    LC  Avg  Per
ΔP: -0.45 ±0.01 (t:40.3, r2:0.805), ΔEpoch: 19.3
ΔP/C: -0.003 ±0 (t:25.5, r2:0.624)
Mag at max: 9.2 ±0.4 (7.8-10.5)
GCVS period: 107.36, GCVS epoch: 2445209
GCVS spectral type: M0e-M5e
E/P (X=15) ε2: 8.2, 2a2: -2.8, r2: 0.971
E/P (X=5) ε2: 4.2, 2a2: 12, r2: 0.957
SV Her
Mean period: 238.52, Mean epoch: 2445142.7    LC  Avg  Per
ΔP: -0.47 ±0.03 (t:16.7, r2:0.606), ΔEpoch: -0.3
ΔP/C: -0.011 ±0.001 (t:13.7, r2:0.512)
Mag at max: 10.1 ±0.4 (9.0-11.2)
GCVS period: 238.99, GCVS epoch: 2445143
GCVS spectral type: M5e
E/P (X=15) ε2: 17.5, 2a2: -17.2, r2: 0.987
E/P (X=5) ε2: 10, 2a2: 8.3, r2: 0.993

 SY Her
Mean period: 116.85, Mean epoch: 2445237.5    LC  Avg  Per
ΔP: -0.06 ±0.01 (t:9.7, r2:0.257), ΔEpoch: -10.5
ΔP/C: -0.001 ±0 (t:11.8, r2:0.339)
Mag at max: 8.5 ±0.3 (8.0-9.5)
GCVS period: 116.91, GCVS epoch: 2445248
GCVS spectral type: M1e-M6e
E/P (X=15) ε2: 3.3, 2a2: 10.6, r2: 0.95
E/P (X=5) ε2: 1.4, 2a2: 16.8, r2: 0.441

 TV Her
Mean period: 304.38, Mean epoch: 2445232.5    LC  Avg  Per
ΔP: 0.1 ±0.04 (t:2.4, r2:0.04), ΔEpoch: -21.5
ΔP/C: 0.014 ±0.002 (t:8.1, r2:0.329)
Mag at max: 9.9 ±0.4 (9.0-11.4)
GCVS period: 304.28, GCVS epoch: 2445254
GCVS spectral type: M4e
E/P (X=15) ε2: 21.6, 2a2: -13, r2: 0.974
E/P (X=5) ε2: 10.4, 2a2: 25.9, r2: 0.889
UV Her
Mean period: 342.67, Mean epoch: 2442992.9    LC  Avg  Per
ΔP: 0.72 ±0.1 (t:7.4, r2:0.398), ΔEpoch: 58.9
ΔP/C: 0.033 ±0.005 (t:7, r2:0.377)
Mag at max: 9 ±0.3 (8.5-9.9)
GCVS period: 341.95, GCVS epoch: 2442934
GCVS spectral type: M6e-M6.5e
E/P (X=15) ε2: 102.5, 2a2: -234.7, r2: 0.97
E/P (X=5) ε2: 47, 2a2: -34.3, r2: 0.964

 UZ Her
Mean period: 263.88, Mean epoch: 2442200.3    LC  Avg  Per
ΔP: 0.14 ±0.03 (t:5.1, r2:0.181), ΔEpoch: 25.3
ΔP/C: 0.006 ±0.001 (t:4.6, r2:0.153)
Mag at max: 9.1 ±0.3 (8.5-9.7)
GCVS period: 263.74, GCVS epoch: 2442175
GCVS spectral type: M5e
E/P (X=15) ε2: 22.5, 2a2: -22.4, r2: 0.974
E/P (X=5) ε2: 11.3, 2a2: 15.6, r2: 0.947

 VV Her
Mean period: 383.81, Mean epoch: 2439911.4    LC  Avg  Per
ΔP: -1.83 ±0.11 (t:16.3, r2:0.829), ΔEpoch: -47.6
ΔP/C: -0.027 ±0.007 (t:3.8, r2:0.209)
Mag at max: 11.1 ±0.4 (10.3-11.9)
GCVS period: 385.64, GCVS epoch: 2439959
GCVS spectral type: M7
E/P (X=15) ε2: 77.2, 2a2: -7.7, r2: 0.918
E/P (X=5) ε2: 64.1, 2a2: -35.7, r2: 0.982
VY Her
Mean period: 300.55, Mean epoch: 2441908.0    LC  Avg  Per
ΔP: 0.17 ±0.05 (t:3.5, r2:0.122), ΔEpoch: -6
ΔP/C: 0.009 ±0.002 (t:4, r2:0.154)
Mag at max: 10.1 ±0.3 (9.3-10.8)
GCVS period: 300.38, GCVS epoch: 2441914
GCVS spectral type: M5e:
E/P (X=15) ε2: 41.5, 2a2: -54.1, r2: 0.983
E/P (X=5) ε2: 18.4, 2a2: 18.7, r2: 0.985

 WX Her
Mean period: 182.70, Mean epoch: 2430554.5    LC  Avg  Per
ΔP: -3.3 ±0.14 (t:22.9, r2:0.894), ΔEpoch: 21.5
ΔP/C: -0.045 ±0.001 (t:61.3, r2:0.984)
Mag at max: 0 ±0 (-)
GCVS period: 186, GCVS epoch: 2430533
GCVS spectral type:
E/P (X=15) ε2: 66.2, 2a2: -102.4, r2: 0.858
E/P (X=5) ε2: 23.6, 2a2: 44.4, r2: 0.936

 WZ Her
Mean period: 248.89, Mean epoch: 2427901.8    LC  Avg  Per
ΔP: 1.09 ±0.03 (t:37, r2:0.95), ΔEpoch: 1.8
ΔP/C: 0.002 ±0.002 (t:1.6, r2:0.033)
Mag at max: 11.4 ±0.4 (10.8-12.3)
GCVS period: 247.8, GCVS epoch: 2427900
GCVS spectral type:
E/P (X=15) ε2: 6.9, 2a2: 13.2, r2: 0.782
E/P (X=5) ε2: 8.4, 2a2: 12.4, r2: 0.615
XZ Her
Mean period: 171.58, Mean epoch: 2433896.5    LC  Avg  Per
ΔP: -0.11 ±0.04 (t:3.1, r2:0.084), ΔEpoch: 9.5
ΔP/C: -0.012 ±0.001 (t:19.6, r2:0.792)
Mag at max: 10.9 ±0.3 (10.5-11.7)
GCVS period: 171.69, GCVS epoch: 2433887
GCVS spectral type: M0
E/P (X=15) ε2: 10.4, 2a2: 3.4, r2: 0.932
E/P (X=5) ε2: 2, 2a2: 31.8, r2: 0.301

 AE Her
Mean period: 249.15, Mean epoch: 2445138.0    LC  Avg  Per
ΔP: 0.16 ±0.03 (t:5.4, r2:0.199), ΔEpoch: -11
ΔP/C: 0.006 ±0.001 (t:4.7, r2:0.159)
Mag at max: 9.9 ±0.4 (9.3-10.8)
GCVS period: 248.99, GCVS epoch: 2445149
GCVS spectral type: M4e
E/P (X=15) ε2: 19.8, 2a2: -10.6, r2: 0.967
E/P (X=5) ε2: 13.7, 2a2: 13, r2: 0.989

 AS Her
Mean period: 268.66, Mean epoch: 2440719.6    LC  Avg  Per
ΔP: -0.48 ±0.04 (t:12.1, r2:0.578), ΔEpoch: -30.4
ΔP/C: 0.003 ±0.002 (t:1.7, r2:0.026)
Mag at max: 8.6 ±0.2 (8.1-9.2)
GCVS period: 269.14, GCVS epoch: 2440750
GCVS spectral type: M2e
E/P (X=15) ε2: 17.9, 2a2: -8.9, r2: 0.98
E/P (X=5) ε2: 12.7, 2a2: 8, r2: 0.952
AZ Her
Mean period: 270.11, Mean epoch: 2436803.2    LC  Avg  Per
ΔP: 1.19 ±0.06 (t:21.4, r2:0.86), ΔEpoch: 21.2
ΔP/C: 0.017 ±0.003 (t:6.5, r2:0.37)
Mag at max: 11.2 ±0.3 (10.2-11.8)
GCVS period: 268.92, GCVS epoch: 2436782
GCVS spectral type: M4
E/P (X=15) ε2: 33.6, 2a2: -36.3, r2: 0.974
E/P (X=5) ε2: 23.8, 2a2: -4.5, r2: 0.979

 CF Her
Mean period: 307.55, Mean epoch: 2434947.4    LC  Avg  Per
ΔP: 1.35 ±0.07 (t:19.2, r2:0.824), ΔEpoch: 45.4
ΔP/C: -0.006 ±0.004 (t:1.5, r2:0.028)
Mag at max: 9.6 ±0.4 (9.1-10.5)
GCVS period: 306.2, GCVS epoch: 2434902
GCVS spectral type: M0
E/P (X=15) ε2: 49, 2a2: -82.4, r2: 0.964
E/P (X=5) ε2: 22.9, 2a2: 13.5, r2: 0.975

 DF Her
Mean period: 333.98, Mean epoch: 2436338.5    LC  Avg  Per
ΔP: -3.72 ±0.15 (t:24.6, r2:0.879), ΔEpoch: -40.5
ΔP/C: 0.068 ±0.006 (t:11.4, r2:0.613)
Mag at max: 10.4 ±0.4 (9.8-11.2)
GCVS period: 337.7, GCVS epoch: 2436379
GCVS spectral type: M6e
E/P (X=15) ε2: 266.3, 2a2: -408.4, r2: 0.967
E/P (X=5) ε2: 175.8, 2a2: -143.1, r2: 0.924
DN Her
Mean period: 226.94, Mean epoch: 2431592.5    LC  Avg  Per
ΔP: 0.94 ±0.06 (t:16.5, r2:0.717), ΔEpoch: 17.5
ΔP/C: -0.005 ±0.002 (t:2.4, r2:0.052)
Mag at max: 10.5 ±0.2 (10.2-10.8)
GCVS period: 226, GCVS epoch: 2431575
GCVS spectral type:
E/P (X=15) ε2: 64.9, 2a2: -125, r2: 0.94
E/P (X=5) ε2: 37.2, 2a2: -4.5, r2: 0.994

 DO Her
Mean period: 213.74, Mean epoch: 2440317.6    LC  Avg  Per
ΔP: -2.54 ±0.12 (t:20.5, r2:0.83), ΔEpoch: -73.4
ΔP/C: -0.046 ±0.001 (t:43.5, r2:0.957)
Mag at max: 11 ±0.3 (10.4-11.8)
GCVS period: 216.28, GCVS epoch: 2440391
GCVS spectral type:
E/P (X=15) ε2: 56, 2a2: -120.5, r2: 0.923
E/P (X=5) ε2: 29.4, 2a2: -13.2, r2: 0.991

 DS Her
Mean period: 263.40, Mean epoch: 2440435.6    LC  Avg  Per
ΔP: -0.03 ±0.03 (t:1.2, r2:0.016), ΔEpoch: -10.4
ΔP/C: 0.006 ±0.001 (t:6.2, r2:0.321)
Mag at max: 10.5 ±0.3 (9.9-11.1)
GCVS period: 263.43, GCVS epoch: 2440446
GCVS spectral type:
E/P (X=15) ε2: 11.7, 2a2: 32.3, r2: 0.865
E/P (X=5) ε2: 13.4, 2a2: 19.4, r2: 0.756
FU Her
Mean period: 212.29, Mean epoch: 2433529.6    LC  Avg  Per
ΔP: -0.11 ±0.05 (t:2.1, r2:0.056), ΔEpoch: 0.6
ΔP/C: -0.017 ±0.002 (t:11.1, r2:0.618)
Mag at max: 11.7 ±0.4 (10.8-12.4)
GCVS period: 212.4, GCVS epoch: 2433529
GCVS spectral type:
E/P (X=15) ε2: 18.6, 2a2: -20.5, r2: 0.901
E/P (X=5) ε2: 6.7, 2a2: 29.3, r2: 0.776

 NP Her
Mean period: 434.48, Mean epoch: 2439675.4    LC  Avg  Per
ΔP: -13.52 ±0.42 (t:32.3, r2:0.96), ΔEpoch: 32.4
ΔP/C: -0.32 ±0.043 (t:7.4, r2:0.564)
Mag at max: 10.1 ±0.4 (9.4-11.1)
GCVS period: 448, GCVS epoch: 2439643
GCVS spectral type: C6,3e(N)
E/P (X=15) ε2: 350.4, 2a2: -708.9, r2: 0.97
E/P (X=5) ε2: 144.2, 2a2: 8.9, r2: 0.955
Horologium
R Hor
Mean period: 404.43, Mean epoch: 2441457.3    LC  Avg  Per
ΔP: -3.17 ±0.09 (t:37.1, r2:0.924), ΔEpoch: -36.7
ΔP/C: 0.033 ±0.005 (t:7.1, r2:0.312)
Mag at max: 5.8 ±0.5 (4.2-7.6)
GCVS period: 407.6, GCVS epoch: 2441494
GCVS spectral type: M5e-M8eII-III
E/P (X=15) ε2: 86, 2a2: -75.3, r2: 0.993
E/P (X=5) ε2: 69.5, 2a2: -39.2, r2: 0.981

 T Hor
Mean period: 217.52, Mean epoch: 2441952.9    LC  Avg  Per
ΔP: -0.08 ±0.03 (t:3.2, r2:0.052), ΔEpoch: -4.1
ΔP/C: 0.003 ±0.001 (t:4, r2:0.078)
Mag at max: 8.4 ±0.4 (7.4-10.7)
GCVS period: 217.6, GCVS epoch: 2441957
GCVS spectral type: M5IIe
E/P (X=15) ε2: 28.2, 2a2: -53, r2: 0.96
E/P (X=5) ε2: 12.4, 2a2: 6.8, r2: 0.996

 U Hor
Mean period: 350.68, Mean epoch: 2434707.6    LC  Avg  Per
ΔP: 2.28 ±0.07 (t:32.1, r2:0.955), ΔEpoch: 69.6
ΔP/C: 0.015 ±0.005 (t:3.3, r2:0.185)
Mag at max: 8.4 ±0.4 (7.7-9.1)
GCVS period: 348.4, GCVS epoch: 2434638
GCVS spectral type: M6IIIe
E/P (X=15) ε2: 43.6, 2a2: -38.1, r2: 0.954
E/P (X=5) ε2: 26.2, 2a2: 21.3, r2: 0.974
Hydra
R Hya
Mean period: 421.66, Mean epoch: 2443887.7    LC  Avg  Per
ΔP: 32.79 ±1.99 (t:16.4, r2:0.637), ΔEpoch: 291.7
ΔP/C: -0.581 ±0.005 (t:125.7, r2:0.99)
Mag at max: 5 ±0.3 (4.0-5.7)
GCVS period: 388.87, GCVS epoch: 2443596
GCVS spectral type: M6e-M9eS(Tc)
E/P (X=15) ε2: 12237.1, 2a2: -32856, r2: 0.954
E/P (X=5) ε2: 4982.3, 2a2: -5465.4, r2: 0.977

 S Hya
Mean period: 256.89, Mean epoch: 2443506.5    LC  Avg  Per
ΔP: 0.26 ±0.04 (t:7.2, r2:0.201), ΔEpoch: -2.5
ΔP/C: 0.003 ±0.001 (t:3.1, r2:0.045)
Mag at max: 7.9 ±0.3 (7.2-9.5)
GCVS period: 256.63, GCVS epoch: 2443509
GCVS spectral type: M4e-M8.0e
E/P (X=15) ε2: 60.7, 2a2: -112.2, r2: 0.954
E/P (X=5) ε2: 28.7, 2a2: 12.2, r2: 0.983

 T Hya
Mean period: 288.94, Mean epoch: 2441933.1    LC  Avg  Per
ΔP: -9.76 ±0.06 (t:164.5, r2:0.993), ΔEpoch: -41.9
ΔP/C: -0.002 ±0.002 (t:0.8, r2:0.004)
Mag at max: 7.8 ±0.3 (7.0-8.8)
GCVS period: 298.7, GCVS epoch: 2441975
GCVS spectral type: M3e-M9:e
E/P (X=15) ε2: 188.8, 2a2: -341, r2: 0.984
E/P (X=5) ε2: 105.5, 2a2: -65.5, r2: 0.991
X Hya
Mean period: 300.60, Mean epoch: 2441076.5    LC  Avg  Per
ΔP: -0.5 ±0.06 (t:8.1, r2:0.301), ΔEpoch: 16.5
ΔP/C: -0.018 ±0.003 (t:6.9, r2:0.241)
Mag at max: 8.6 ±0.3 (8.0-9.5)
GCVS period: 301.1, GCVS epoch: 2441060
GCVS spectral type: M7e-M8.5e
E/P (X=15) ε2: 59.5, 2a2: -87.6, r2: 0.974
E/P (X=5) ε2: 30.7, 2a2: 17.8, r2: 0.987

 RR Hya
Mean period: 342.13, Mean epoch: 2439144.9    LC  Avg  Per
ΔP: -1.36 ±0.09 (t:15.4, r2:0.656), ΔEpoch: -67.1
ΔP/C: -0.026 ±0.004 (t:6.4, r2:0.249)
Mag at max: 9.4 ±0.4 (8.3-10.6)
GCVS period: 343.49, GCVS epoch: 2439212
GCVS spectral type: M3.0e-M8e
E/P (X=15) ε2: 133.5, 2a2: -241.6, r2: 0.984
E/P (X=5) ε2: 76.2, 2a2: -38.5, r2: 0.984

 RS Hya
Mean period: 335.67, Mean epoch: 2439159.2    LC  Avg  Per
ΔP: -2.93 ±0.06 (t:45.3, r2:0.94), ΔEpoch: -9.8
ΔP/C: -0.001 ±0.003 (t:0.4, r2:0.001)
Mag at max: 10 ±0.5 (9.0-11.5)
GCVS period: 338.6, GCVS epoch: 2439169
GCVS spectral type: M6e
E/P (X=15) ε2: 85.1, 2a2: -109.4, r2: 0.982
E/P (X=5) ε2: 45.3, 2a2: 2, r2: 0.947
RU Hya
Mean period: 332.06, Mean epoch: 2443147.8    LC  Avg  Per
ΔP: 0.56 ±0.06 (t:9.3, r2:0.39), ΔEpoch: -14.2
ΔP/C: -0.032 ±0.001 (t:26.5, r2:0.839)
Mag at max: 8.5 ±0.5 (7.5-10.5)
GCVS period: 331.5, GCVS epoch: 2443162
GCVS spectral type: M6e-M8.8e
E/P (X=15) ε2: 20.7, 2a2: 24.7, r2: 0.991
E/P (X=5) ε2: 23.7, 2a2: 15.4, r2: 0.998

 ST Hya
Mean period: 303.24, Mean epoch: 2440259.2    LC  Avg  Per
ΔP: -1.51 ±0.06 (t:25.3, r2:0.868), ΔEpoch: -22.8
ΔP/C: 0.022 ±0.002 (t:9.8, r2:0.5)
Mag at max: 9.4 ±0.4 (8.8-10.3)
GCVS period: 304.75, GCVS epoch: 2440282
GCVS spectral type: Me
E/P (X=15) ε2: 20.5, 2a2: 17.6, r2: 0.687
E/P (X=5) ε2: 12.7, 2a2: 29.1, r2: 0.58

 UZ Hya
Mean period: 262.59, Mean epoch: 2442572.1    LC  Avg  Per
ΔP: 1.64 ±0.07 (t:23.2, r2:0.832), ΔEpoch: 45.1
ΔP/C: 0.007 ±0.003 (t:2.1, r2:0.038)
Mag at max: 9.3 ±0.2 (9.0-9.8)
GCVS period: 260.95, GCVS epoch: 2442527
GCVS spectral type: M4e
E/P (X=15) ε2: 133.8, 2a2: -283.1, r2: 0.931
E/P (X=5) ε2: 50.7, 2a2: 6.9, r2: 0.946