"Dark matter": methinks not

No they didn’t; Moti seems some sort of diminuative for Mordehai.

Correct.

It’s actually 7 parameters - a position, a velocity and a time.
Taking the question at it’s most extreme, sure. But what would that explain? There’s nothing about Sedna’s orbit that’s remotely in violation of Newtonian dynamics.

Thank you; that clears up my confusion.

The 6 parameters I was referring to are semi-major axis, inclination of orbit, eccentricity, ascending node, argument of perihelion, and mean anomaly. Are you saying average orbital velocity is the 7th? Makes sense; it’s not redundant if the mass of center (or effect of the mass of center at low accelerations) is unknown. So either a solution only exists for Newtonian gravity, or two solutions exist, one for Newtonian and one for MOND. Eventually, as Thaumaturge said, we will see which solution ends up being the best fit, and MOND will either be proven or disproven to affect orbits at that distance.

I think both Voyagers are further away then the pioneers (due to greater speed, mainly from stealing more speed from planets). and I have heard that they are encountering some ‘slowdown’.

I seem to recall the solar wind forming a barrier of sorts against the ‘galactic’ wind pressing inwards, perhaps this is the cause of the slowing. Or maybe the sun somehow protects against cronoton waves that convert matter into thrusters and are slowly eating away at our probes, and ‘pushing them back’.