February 25, 2026
m9 = 5M a9 = 500 AU e9 = 0.25 i9 = 20 deg
0.4
0.2
0
-0.2
-0.4
-0.6
-1.0 -0.5 0 0.5 1.0
p2 Г cos ∆$
-0.6
-0.4
-0.2 0 0.2
p2 Z cos ∆⌦
0.4
0.6
Figure C.28: Phase space evolution of distant KBOs. This Figure projects the phase-space evolution of the observed long-period KBOs in the same way as in Figure 17. Under the influence of P9’s gravitational potential, the KBOs 2014 SR349, 2010 GB174, 2012 VP113, Sedna, 2004 VN112, 2015 TG387, 2013 SY99,
2013 RF98, 2014 FE72 and 2015 RX245 maintain long-term apsidal confinement and clustering of the orbital poles. Conversely, the KBOs 2013 FT28, 2015 GT50, 2015 KG163, and 2007 TG422 are typically unstable and their depicted long-lived clones derive orbital stability primarily for excitation of extreme orbital inclinations.
that survives over the entire integration time of 4 Gyr is shown in the figure, which depicts the evolution in phase-space, as done in Figure 17. The phase-space trajecto- ries corresponding to individual objects are labeled by color, as shown. In the pres- ence of Planet Nine, the observed distant KBOs display the same type of dynamics as that described in sections 4 and 5. All of the objects that are long-term stable (particularly, 2014 SR349, 2010 GB174, 2012 VP113, Sedna, 2004 VN112, 2015 TG387,
2013 SY99, 2013 RF98, 2014 FE72 and 2015 RX245) execute secular apsidal librations (shown in the left panel), while their orbital poles cluster together as expected (shown in the right panel). The objects 2013 FT28, 2015 GT50, 2015 KG163, and 2007 TG422 are typically unstable. However, their stable clones shown in the figure execute high- inclination dynamics, as shown by the light purple, cyan, yellow, and dark orange paths in the right panel of Figure C.28.
In summary, this appendix has presented simulations of the observed a > 250 AU KBOs in the presence of P9 with revised parameters. The results of these simulations show that this Planet Nine model allows the real object to remain stable over billions of years (Figure C.27) and facilitates sustained clustering of their orbits in a manner that is consistent with observations (Figure C.28).
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