Eris would be a nice addition in RSS since it is almost as large as Pluto. The much bigger perihelion/aphelion, eccentricity and inclination would also make a nice challenge for RSS grand tours!
TODO list:
From JPL HORIZONS data:
$$SOE
2433282.423500000 = A.D. 1949-Dec-31 22:09:50.4000 TDB
EC= 4.350533671820225E-01 QR= 5.749761669544849E+09 IN= 6.423871172249270E+01
OM= 2.645097109032302E+01 W = 1.663492085434828E+02 Tp= 2341659.772103613243
N = 2.032894408073211E-08 MA= 1.609279277845442E+02 TA= 1.716155773741571E+02
A = 1.017753064721317E+10 AD= 1.460529962488148E+10 PR= 1.770874072801499E+10
$$EOE

Eris would be a nice addition in RSS since it is almost as large as Pluto. The much bigger perihelion/aphelion, eccentricity and inclination would also make a nice challenge for RSS grand tours!
TODO list:
From JPL HORIZONS data: