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Fig. 2
Change in period (ΔP) and heliocentric distance versus time around perihelion for Model B normalized to match observations on Apr. 13, 2015 when the observed ΔP was + 80.5 s. The observed values for the rotation period are listed in Table 1. The ΔP that is equivalent to the change during the last apparition is −1285 s.
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