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From the linear equation (correlation coefficient: 0.9961), "869.05"'s orbital properties were approximated as: Semi-Major Axis: 0.3461 ± 0.0044 AU,
Period: 84.5417 ± 0.2834 days,
thus giving a mean motion ratio for "869.05"/869.02 of 2.33/1.00 (or 7/3).
Then, using the equation from the Fabrycky reference (below), the MMR estimate of 7/3, and the above-determined P_ttv_869.02 of 597.32, the "869.05"'s Period was alternately estimated as 86.4029 days, in good agreement with the one defined by the L-B Rule.

Literature Tc#, Tc, and TTV Major Tabulations and Other References: see my "Summary" webpage.
• Fabrycky et al., arXiv-1201.5415; P_ttv = 1/|(nmmri_a/P_a - nmmri_b/P_b)|.
• Bovaird & Lineweaver, 2013, arXiv:1304.3341.

28 Sep 2014
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.

1st Figure: KOI-869.04, P = 3.22 days [Plot avg. error bars = ± 9.71 min. (smaller than symbols)]
Lomb-Scargle periodogram: no credible periodicities
Linear ephemeris (this work): Tc = 3.21981747(Tc#) + 66.00257825

2nd Figure: KOI-869.01, P = 7.49 days [Plot avg. error bars = ± 7.05 min.]
Lomb-Scargle periodogram: no credible periodicities
Linear ephemeris (this work): Tc = 7.49019841(Tc#) + 107.94813095

3rd Figure: KOI-869.03, P = 17.49 days [Plot avg. error bars = ± 11.28 min.]
Lomb-Scargle periodogram: no credible periodicities
Linear ephemeris (this work): Tc = 17.46085149(Tc#) + 70.26371239

4th Figure: KOI-869.02, P = 36.28 days [Plot avg. error bars = ± 6.21 min. (smaller than symbols)]
TTV_minimum: 174.30 ± 19.08 days, Amp_ttv_minimum: -55.76 ± 5.96 min.
TTV_maximum: 472.96 ± 21.02 days, Amp_ttv_maximum: 55.71 ± 5.96 min.
TTV_minimum: 771.62 ± 24.32 days, Amp_ttv_minimum: -55.76 ± 5.96 min.
TTV_maximum: 1070.28 ± 28.51 days, Amp_ttv_maximum: 55.71 ± 5.96 min.
TTV_minimum: 1368.94 ± 33.25 days, Amp_ttv_minimum: -55.76 ± 5.96 min.
P_ttv: 597.32 ± 11.98 days.
Amp_ttv: 111.48 ± 8.43 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 597.46 days; Power: 11.81; FAP: 6.748 x 10^-10.
Linear ephemeris (this work): Tc = 36.27540836(Tc#) + 134.30763816
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The Lineweaver-Bovaird Rule ("L-B Rule", ref. below) was used to estimate orbital properties for the potential unseen (non-transiting) planets, "869.05":
KOI-869 (Kepler-245, KIC-6948054) 5-(or more?)-Planets

The three closest-in planets in this system (869.04, 869.01, and 869.03) showed no significant TTVs while the 4th planet (869.02) shows a strong obvious one.  The implication is that there is a 5th unseen, non-transiting planet ("869.05") in the system.  The semi-major axis and period of this 5th hypothetical planet was then approximated using the Lineweaver-Bovaird Rule (discussion and reference below).