I'll make the large assumption that we're on the same planet. The Equatorial diameter of Earth is 7926.4 miles
One AU is the distance between Earth and the Sun. No planet is that big across so you can only be talking about distance from the sun and in that case Earth by definition has an astronomical unit.
Jupiter has a diameter of about 86,881 miles (139,822 kilometers) at its equator, making it the largest planet in our solar system.
I'm not familiar with the word urans. If you mean the planet Uranus, it's diameter is 31518 miles and the distance on the surface from one side to the other is 49508 miles
The distance across Neptune at its equator is 30,599 miles. This is equal to 49,244 kilometers. Neptune is the fourth largest planet.
The distance from surface to surface through the center of a planet would be that planet's "diameter".
The minimum distance a moon can orbit a planet is governed by the Roche limit, which is the point at which the gravitational tidal forces from the planet would tear the moon apart due to the difference in gravitational attraction across its body. Beyond the Roche limit, the moon would start to disintegrate.
The longest distance across a circle is its diameter
A planet's maximum distance from the Sun is known as its aphelion. This point occurs when the planet is at the farthest point in its elliptical orbit around the Sun. The distance between the planet and the Sun is greatest at aphelion.
There is something missing from the question. The planet must have a moon. The only way to measure the mass of a planet is by using data about a moon orbiting the planet or data about the path of a spacecraft passing or going into orbit around the planet. If you know the distance to a planet then you can work out the moon's distance from the planet. The planet's mass can then be found. It's a bit of trigonometry and Newton's version of Kepler's Third Law. So that's the reason that it is necessary to know the distance to the planet.
Our planet, Earth.
If you mean distance, the next major object it planet Mercury.If you mean distance, the next major object it planet Mercury.If you mean distance, the next major object it planet Mercury.If you mean distance, the next major object it planet Mercury.
How does a planet's distance from the sun affect its period of revolution?