5-Astronomy-Solar System-Planetoid

Pluto as planetoid

Small planets {Pluto, planetoid} are planetoids.

properties

Diameter is 2,400,000 meters. Mass is 0.1 Earth mass. Density is probably like that of rock. Gravity is less than Moon gravity.

properties: rotation

Pluto rotates every 6.4 days.

properties: temperature

Surface temperature is 43 K.

properties: orbit

Pluto averages 5,900,000,000,000 meters from Sun, with highly elliptical orbit of 248 years, inclined 17 degrees to ecliptic. It has seasons. Pluto is in Kuiper belt.

surface

Surface has frozen nitrogen, carbon monoxide, methane, and water.

atmosphere

Atmosphere is rapidly evaporating.

moons

Pluto has one moon, Charon, 1,200,000-meter diameter and 19,000,000 meters away.

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5-Astronomy-Instruments

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Date Modified: 2014.1008