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1 vote
1 answer
100 views

Are there any known low-inclination trans-Neptunian objects?

All the trans-Neptunian object's orbits I know are very inclined compared to those of the eight recognized planets, and Centaur's orbits are highly inclined as well. Are there any known Centaurs and/...
John's user avatar
  • 113
-10 votes
3 answers
964 views

Why isn't Eris considered a planet despite being the body of dominant mass?

The 2006 definition of a planet states that a planet is a celestial body that (a) is in orbit around the Sun (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it ...
user30007's user avatar
  • 1,236
5 votes
1 answer
195 views

How many observations does it take to determine the orbit of a TNO

Several observations of a distant solar object must be taken before determining its orbit, but in the case of objects discovered beyond Neptune's orbit, just how many are required over what period of ...
Jerard Puckett's user avatar