Jupiter The planet is the fifth one out from the Sun, and it’s also the biggest one in our solar system. Jupiter’s mass exceeds that of every other planet in our solar system combined by a factor of two and a half, making it the most massive object in our solar system.
It is common practise to refer to the mass of such objects as a “Jupiter mass” (sometimes written as MJ or MJup), and this is especially true when discussing the masses of extrasolar planets and brown dwarfs.
Jupiter is the planet with the fastest rotational speed, making it the leader of the “outer” planets, often known as the gas giants. Jupiter has days that are far shorter than those on Earth.
Jupiter’s year is nearly identical in length to that of Earth’s. That’s a little under half the amount of time it takes Saturn to complete one orbit around the Sun.
Due to the rapidity with which Jupiter rotates, it, like Saturn, develops an equatorial bulge, which can be observed using an amateur telescope stationed on Earth.
The time it takes for Earth to pass Jupiter once every 398.9 days during its orbit around the Sun is known as the synodic period. Due to the fact that it is moving in this direction, Jupiter appears to be moving in the opposite direction of the background stars. This results in Jupiter appearing to move backward in the night sky for a period of time, creating the illusion of a looping motion.
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