TTVs are derived from Q1-Q17 Kepler data.  x-axes: “Observed Tc” (Mid-Transit Time): EXOFAST’s best-fits from Normalized PDCSAP_FLUX Kepler light flux vs. time (BJD_tdb - 2454900) data.  y-axes: “(O – C)”: difference between Observed Tc and the Calculated Tc from the graphically obtained linear ephemeris.

Figure: KOI-775.02, P = 7.88 days [Plot avg. error bars = ± 5.11 min.]
TTV_minimum: 161.40 ± 7.87 days, Amp_ttv_minimum: -14.87 ± 2.14 min.
TTV_maximum: 264.07 ± 8.12 days, Amp_ttv_maximum: 16.72 ± 2.14 min.
TTV_minimum: 366.74 ± 8.46 days, Amp_ttv_minimum: -14.87 ± 2.14 min.
TTV_maximum: 469.41 ± 8.91 days, Amp_ttv_maximum: 16.72 ± 2.14 min.
TTV_minimum: 572.08 ± 9.43 days, Amp_ttv_minimum: -14.87 ± 2.14 min.
TTV_maximum: 674.74 ± 10.02 days, Amp_ttv_maximum: 16.72 ± 2.14 min.
TTV_minimum: 777.41 ± 10.66 days, Amp_ttv_minimum: -14.87 ± 2.14 min.
TTV_maximum: 880.08 ± 11.35 days, Amp_ttv_maximum: 16.72 ± 2.14 min.
TTV_minimum: 982.75 ± 12.08 days, Amp_ttv_minimum: -14.87 ± 2.14 min.
TTV_maximum: 1085.42 ± 12.84 days, Amp_ttv_maximum: 16.72 ± 2.14 min.
TTV_minimum: 1188.09 ± 13.63 days, Amp_ttv_minimum: -14.87 ± 2.14 min.
TTV_maximum: 1290.76 ± 14.44 days, Amp_ttv_maximum: 16.72 ± 2.14 min.
TTV_minimum: 1393.43 ± 15.27 days, Amp_ttv_minimum: -14.87 ± 2.14 min.
TTV_maximum: 1496.10 ± 16.12 days, Amp_ttv_maximum: 16.72 ± 2.14 min.
P_ttv: 205.34 ± 1.94 days.
Amp_ttv: 31.59 ± 3.02 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 205.61 days; Power: 24.81; FAP: 2.044 x 10^-8.
Linear ephemeris (this work): Tc = [7.87741414 ± 0.00002133](Tc#) + [109.37687871 ± 0.00208485]


Numerous literature and major Tc#, Tc, and TTV tabulation references can be found on my "Summary" webpage following the table.

22 May 2015
       Kepler KOI-775 (Kepler-52; KIC-11754553) 4-(or more?)-Planet System

Discussion:
A sinusoidal curve-fit of the [(O-C) vs. Time] data for KOI-775.02 (Kepler-52b) showed (Figure below) a periodicity (P_ttv) of 205.34 ± 1.94 days; a Lomb-Scargle Periodogram (LSP) of the same data gave a high-credibility periodicity of 205.61 days.

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