Pluto's orbit?

Question

What is unique about Pluto's orbit?

Pluto is a terrestrial planet beyond the gaseous planets
Pluto's orbit is tilted, compared to other planets
Pluto's orbit appears to speed up and slow down
Pluto has the most difficult orbit to observe.

Answer 1

All of the above.

Pluto is rock and ice.
Pluto's orbit is tilted compared to the plane of the rest of the planets.
All elliptical orbits speed up as they get closer to their primary (our sun) and slow down as they move away. Pluto's orbit is so elliptical it goes inside Neptune's orbit for part of its orbit.
Finally, because of its distance and small size. Pluto is the most difficult of the well known planets. In actuality, similar minor planets have been found further out. It was those discoveries that led to Pluto's demotion rather than have more ice-balls in the planet category.

Answer 2

All are probably correct, though #2 is the only one that is relevant to the question about its orbit.

Pluto is thought to be a rocky body.

It's orbit is much more highly tilted as compared to the other planets.

#3 could be correct, in that Pluto does speed up and slow down in it's orbit. It's not the orbit that speeds up/slows down, but Pluto itself.

Because of Pluto's small size and great distance, it is the most difficult "planet" to observe. No probe has ever visited, but the New Horizons probe is due to make a close flyby in July of 2015.

Answer 3

Well, Pluto is no longer a planet; its status was changed at a recent meeting of the International Astronomical Union.

The tilt, or what astronomers call inclination, the angle between the plane of Pluto's orbit and the plane of the Earth's orbit. Pluto's inclination is 17 degrees; the largest planetary inclination is Mercury's 7 degrees, other planets' inclinations are less than 3 degrees.

Pluto's speed in its orbit doesn't appear to vary, it does vary because Pluto's distance from the sun varies by 25% over the course of one orbit. By comparison, the Earth's distance from the sun varies by 3%.

Pluto is difficult to observe because it is small and far away, so appears very faint to us on Earth, and requires fairly powerful telescopes and good telescope pointing to observe it. For more on Pluto and other solar system objects, please see the wonderful site "The Nine Planets" at www.nineplanets.org

Answer 4

Pluto's orbit is tilted by 18degrres from the plane.

Answer 5

second answer.

also it is more elliptical than other planets orbits part of it's orbit is actually inside the orbit of Neptune.