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Nereid has a long orbital period, but there are others with longer periods, for example Phoebe, a moon of Saturn.

If you count all the moons, including the really small ones, the answer is "Neso"

the outermost moon of Neptune. That has an orbital period of over 25 Earth years.

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10y ago
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14y ago

Neptune, since it is further away from the sun and since Pluto is not a planet anymore. According to Kepler's third Law of Planetary motion (The Harmonic Law). The more distance a planet's orbit is from the sun, the longer it's year.

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10y ago

Neptune is the gas giant furthest from the Sun and Kepler's third law tells us that the period of revolution of a planet around the sun increases as distance from the Sun increases. It does not matter if the planet is a gas giant or not. The law says period depends on distance and not mass.

It takes 60,190 days for Neptune to orbit the Sun which is about 165 Earth years. For that matter, one Neptune Year is 89,666 Neptune days.

If Pluto was still a planet, it would get the record for the longest year since it is, on the average, further than the other planets.

Pluto has an orbital period of 248 earth years. Since Pluto was discovered in 1930, it has only completed about 1/3 of a revolution.

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7y ago

Since Pluto is no longer considered a planet that title goes to Neptune, with an orbital period of 165 years.

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12y ago

Pluto! If it's still a planet, I think it is. Next in line is Neptune.

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7y ago

Neptune, the farthest planet from the Sun

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13y ago


venus

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Q: What planet has the longest period of rotation?
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Related questions

Which planet has the longest rotation period?

Pluto has the longest REVOLUTION period Venus has the longest ROTATION period


The planet with the largest rotation?

The planet with the largest (or longest) rotation period is Venus, at 243 Earth days (retrograde, meaning clockwise, instead of counterclockwise like the Earth).


Which planet has the longest rotation?

Venus


What planet with the longest rotation?

venus


What planet requires one earth year to rotate on its axis?

There is no such planet known. The planet with the longest rotation period is Venus. That rotates in about 243 Earth days.


What inner planet has the longest rotation?

Venus  


Which planet have the longest rotation?

If you count Pluto as a planet its Pluto :D


What planet has the longest revolution?

If you mean revolution on it axis (spin/day length) rather than orbital period, then the answer is the planet Mercury, where time between sunrises is roughly 176 Earth days.


What is one rotation period for a planet called?

chocolate pie... but that was 3 years ago...


What is the difference of a planets period of rotation and period of revolution?

The difference between the rotation and revoulution is that rotation is the spiinning of the planet on its axis and revoulution is the orbiting of the planet around the sun.


Which planets have the longest and shortest period of rotation?

''Mercury (shortest),''Neptune (longest)


What is the difference between a planets period of rotation and period of revolution?

The difference between the rotation and revoulution is that rotation is the spiinning of the planet on its axis and revoulution is the orbiting of the planet around the sun.