Jupiter Overview

Jupiter
Topics

  • Orbital and Physical Properties

  • The Atmosphere of Jupiter

  • Internal Structure

  • Jupiter’s Magnetosphere

  • A Cometary Impact

  • The Moons of Jupiter

  • Galilean Moons

  • Jupiter’s Ring

Orbital and Physical Properties

  • The figure showing the solar system emphasizes the relationship of the Jovian planets to the rest of the system, notably that Jupiter is the largest planet, often referred to as the "King of the Planets."

Planetary Data

  • Orbital semi-major axis: 5.2 AU (Astronomical Units, where 1 AU is the distance from Earth to the Sun)

  • Orbital Period: 12 years, showcasing a long journey around the Sun relative to Earth.

  • Inclination: 1.31°, indicating a slight tilt relative to the plane of the solar system.

  • Angular diameter: 50 arcseconds, which is useful for astronomical observations.

  • Mass: $1.9 \times 10^{27} \text{ kg}$, making it more than twice the mass of all other planets combined, underlining its dominance in the solar system.

  • Radius: 71,500 km, making it the largest planet with a radius 112 times that of Earth.

  • Density: 1300 kg/m³, indicating it cannot possess a rocky or metallic composition like the terrestrial planets but instead a gaseous exterior.

  • Differential Rotation Rate: Not a rigid body; equatorial rotation time is 9 hours 50 minutes, while at the poles it is 9 hours 55 minutes, emphasizing that its rapid rotation results in significant flattening.

  • Axial (rotational) tilt: 3°, contributing to the minimal seasonal variation.

  • Magnetic Field: Has the strongest magnetic field among the planets, measuring 14 times stronger than Earth’s surface field, due to its large metallic hydrogen interior.

  • Magnetic Tilt (relative to rotation): 10°, illustrating a slight misalignment.

  • Albedo: 0.52, which is the second highest among planets, indicating it reflects a significant portion of sunlight.

  • Surface Temperature: Cloud tops at approximately 124 K (-237°F), revealing its frigid environment.

  • Number of Moons: 95, a testament to its ability to capture numerous celestial bodies in its gravitational pull.

The Atmosphere of Jupiter

  • Major Visible Features: Bands of clouds (which represent powerful storms), particularly the Great Red Spot, a colossal storm system approximately 10,000 km long that has intrigued scientists for centuries.

  • Great Red Spot: A persistent anticyclonic storm that has existed for at least 300 years, possibly much longer, with mysterious origins regarding its color and energy source, leading to various theories about its dynamics.

Composition of Atmosphere

  • Hydrogen (H): 86.1% of the atmosphere.

  • Helium (He): 13.8%, indicating a composition similar to that of the Sun, with other minor gases including:

    • Methane, Ammonia, Water Vapor: 1%, the presence of which suggests possible chemical reactions creating the vivid colors observed in the upper atmosphere, as these primary components alone cannot fully explain the atmospheric hues.

Atmospheric Structure

  • No Solid Surface: The lack of a defined solid surface makes it difficult for optical telescopes to observe the lowest cloud layers, indicating the gaseous nature of Jupiter.