Pluto crossings of Neptune's orbit
Chiron crossings of Saturn and other Centaurs
Pholus crossings of Saturn, Uranus, Neptune, Pluto
Nessus crossings of Uranus and Neptune
Asbolus crossings of Saturn and Uranus
1974TA crossings of Uranus
Hylonome crossings of Uranus and Neptune
Chariklo crossings of Uranus
1998QM107 crossings of Uranus
1998SG35 crossings of Saturn
1998TF35 crossings of Uranus, Neptune, and Pluto
1998BU48 crossings of Neptune and Pluto
1999OX3 crossings of Uranus, Neptune, and Pluto
1999TD10 crossings of Uranus, Neptune, and Pluto
1999UG5 crossings of Saturn
1999XX143 orbit crossings of Saturn and Uranus
2000FZ53 crossings of Uranus, Neptune, and Pluto
2000GM137 crossings of Saturn
2000QB243 crossings of Uranus, Neptune, and Pluto
2001PT13 crossings of Saturn
2000QC243 crossings of Uranus

 
The "distance ranges" that have been added to the tables represent the orbital "ring" of the major planets defined by their osculating perihelion and aphelion distances.

Orbit crossings are very sensitive to small errors in the ephemerides, especially for the outermost planets and the Centaurs, whose motion is not well known before the 20th Century. And this is particularly true regarding distances. For my calculations, I have used the complete VSOP87 theory in combination with the numerical integrations of the centaurs. The accuracy is 1 day, assuming that the orbits are exact. 

 

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