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Also, you put the diameter estimate of each lobe as the radius which made 2014 MU69 twice its actual size.
This is unfortunately a mistake that sometimes happens to me.
For this, the axis of rotation of the Barycenter would have to point to the sun. (As far as I know.) This does not work in SE 0.980
. (In SE 0.990 it works (currently)).
In SE 0.980 I have to do a trick for it. I have to replace the barycenter with another asteroid. (A very small, with a radius of 1 meter.)
Then it works.
(However, the South Pole of the axis must point to the Sun for Ultima Thule to rotate clockwise, as in this video: https://www.youtube.com/watch?v=kSHOOFBxRvA