Amalthea

Moon
Dimensions:125 x 73 x 64
Amalthea Radius

Radius of Amalthea

The radius of Amalthea is one of its most fundamental physical characteristics. The Amalthea radius measures approximately 84 km, making it 75.85× smaller than Earth. This measurement represents the average distance from the center of Amalthea to its surface, providing crucial information about the celestial body's size and volume.

Understanding the Amalthea radius is essential for calculating other important properties such as surface area, volume, and gravitational characteristics. The radius directly influences how we perceive and study this fascinating object in our Solar System.

Amalthea Semi-Major Axis

Orbital Radius of Amalthea

The Amalthea semi-major axis is a critical orbital parameter that defines the average distance from the Sun. The Amalthea semi-major axis measures 0.00 AU (approximately 181,400 km), which represents the average orbital radius of Amalthea. This measurement is fundamental to understanding Amalthea's position in the Solar System and its relationship with other celestial bodies.

The orbital radius of Amalthea determines how much solar radiation the planet receives, which directly influences its temperature, climate, and overall environmental conditions. This distance places Amalthea in a specific region of the Solar System, each with unique characteristics and scientific significance.

When we examine the Amalthea semi-major axis 0.00 AU, we gain insights into the planet's orbital mechanics, including its orbital period, velocity, and the gravitational forces at play. This parameter is essential for space mission planning and understanding the dynamics of our Solar System.

Amalthea Mass

Mass of Amalthea in kg

The Amalthea mass is a fundamental property that determines many of the planet's physical characteristics. The mass of Amalthea in kg is approximately 7.50e+18 kg, which is 796266.67× less than Earth's mass. This substantial mass creates a significant gravitational field that influences everything from atmospheric retention to orbital dynamics.

Understanding the Amalthea mass allows scientists to calculate other critical properties such as surface gravity, escape velocity, and the planet's ability to retain an atmosphere. The mass also plays a crucial role in determining how Amalthea interacts with other celestial bodies through gravitational forces.

The precise measurement of the mass of Amalthea in kg is essential for space exploration missions, as it affects spacecraft trajectories, landing procedures, and the design of scientific instruments. This fundamental property helps us understandAmalthea's formation history and its place in the evolution of our Solar System.

Amalthea Orbital Period

How Long is a Year on Amalthea?

The Amalthea orbital period defines the length of one complete revolution around the Sun. The Amalthea orbital period is 0.00 hours, which is 63346881.65× shorter than Earth's year. This orbital period determines the length of Amalthea's year and directly influences seasonal patterns, climate cycles, and temperature variations.

The Amalthea orbital period is directly related to its distance from the Sun, following Kepler's laws of planetary motion. Planets farther from the Sun have longer orbital periods, while those closer complete their orbits more quickly. This relationship helps explain why Amalthea takes the time it does to complete one full orbit.

Understanding the Amalthea orbital period is crucial for space mission planning, as it affects launch windows, travel times, and the timing of scientific observations. This fundamental orbital parameter also provides insights into the planet's formation history and its current position in the Solar System's dynamic structure.

How Far is Amalthea from Earth?

Distance Between Amalthea and Earth

How far is Amalthea from Earth? This is a question that fascinates both astronomers and space enthusiasts. The distance between Amalthea and Earth varies throughout their orbital cycles, but on average, Amalthea is approximately 1.49e+8 km(0.999 AU) away from Earth. This distance changes as both planets orbit the Sun, with the closest approach (opposition) and farthest separation (conjunction) creating significant variations.

The question "How far is Amalthea from Earth?" has practical implications for space exploration. This distance determines travel time for spacecraft, communication delays for mission control, and the amount of fuel required for interplanetary missions. Understanding this distance is essential for planning future missions to Amalthea.

The distance between Amalthea and Earth is not constant due to the elliptical nature of both planets' orbits. When Amalthea and Earth are on the same side of the Sun (opposition), they are at their closest, making this the optimal time for observations and potential missions. Conversely, when they are on opposite sides of the Sun (conjunction), they are at their farthest separation, which can exceed the average distance significantly.

Physical Properties
Mean Radius
84km
Equatorial Radius
83.45km
Polar Radius
0km
Mass
7.50e+18 kg
Volume
2.43e+6 km³
Density
0.857g/cm³
Gravity
0.02m/s²
Escape Velocity
0m/s
Flattening
0
Average Temperature
0.0 K (-273.1 °C)
Axial Tilt
0°
Semimajor Axis
181,400km
Perihelion
181,150km
Aphelion
182,840km
Eccentricity
0.003
Inclination
0.38°
Sidereal Orbit
0.00 hours
Sidereal Rotation
0.00 hours
Mean Anomaly
0°
Argument of Periapsis
0°
Longitude of Ascending Node
0°

Overview of Amalthea

Amalthea is a fascinating moon in our Solar System that has captured the attention of astronomers and space enthusiasts alike. With a Amalthea radius of 84 km, making it 75.8× smaller than Earth's size, this celestial body presents unique characteristics that distinguish it from other objects in our cosmic neighborhood. Positioned at an average distance of 181,400 km (0.001 AU) from the Sun, Amalthea occupies a significant place in the Solar System's architecture. As a moon, Amalthea demonstrates the incredible diversity of natural satellites that orbit larger celestial bodies throughout our Solar System.

Physical Characteristics

The Amalthea physical characteristics reveal a world of remarkable dimensions and properties. The Amalthea radius measures 84 km, making it 75.8× smaller than Earth's size. The Amalthea mass of 7.50e+18 kg represents 796266.7× smaller than Earth's mass, giving this world substantial gravitational influence. With a volume of 2.43e+6 km³, Amalthea occupies significant space in the Solar System. The Amalthea density of 0.857 g/cm³ (6.4× smaller than Earth's density) provides clues about its internal composition, while the surface gravity of 0.02 m/s² (490.5× smaller than Earth's gravity) determines how objects behave on its surface. The low density indicates a composition dominated by lighter elements, characteristic of gas giants or icy bodies.

Orbital Properties

The Amalthea orbit reveals fascinating details about its journey around the Sun and its relationship to other Solar System objects. The Amalthea orbit has a semimajor axis of 181,400 km (0.001 AU), placing it 824.7× smaller than Earth's distance from the Sun. At its closest approach (perihelion), Amalthea comes within 181,150 km of the Sun, while at its farthest point (aphelion), it reaches 182,840 km, creating a 0.9% variation in solar distance. The Amalthea orbit is nearly circular with an eccentricity of 0.003 (5.6× smaller than Earth's orbital eccentricity), resulting in relatively stable solar heating throughout its year. The Amalthea orbit takes 0.00 hours to complete (63346881.6× smaller than Earth's orbital period), defining the length of its year. The orbital inclination of 0.38° indicates how much the Amalthea orbit is tilted relative to the Solar System's ecliptic plane. This low inclination means Amalthea follows a path very close to the plane where most planets orbit, suggesting a stable formation history.

Rotation and Tilt

The Amalthea rotation and axial orientation provide crucial insights into its daily and seasonal cycles, as well as its orbital dynamics. The Amalthea rotation period of 0.00 hours (7206.6× smaller than Earth's rotation period) determines the length of its day. This extremely fast rotation creates intense centrifugal forces and may contribute to the planet's flattened shape. The Amalthea axial tilt of 0° determines the intensity and nature of seasonal variations. With minimal axial tilt, Amalthea experiences virtually no seasonal changes, maintaining relatively constant temperatures throughout its year. The orbital orientation parameters reveal additional details about Amalthea's position in space. The mean anomaly of indicates the planet's current position in its orbit relative to its perihelion. The argument of periapsis of shows how the orbit's orientation changes over time due to gravitational perturbations. The longitude of ascending node of defines the reference point where the orbit crosses the ecliptic plane.

Temperature and Atmosphere

The Amalthea temperature and atmospheric conditions are fundamental to understanding its habitability and environmental characteristics. The Amalthea average temperature of 0.0 K (-273.1 °C) (-459.7°F) provides the baseline for understanding its climate. These extremely cold temperatures make Amalthea inhospitable to life as we know it, with any atmosphere likely frozen solid on the surface. Compared to Earth's average temperature of 15°C (59°F), Amalthea presents a dramatically different thermal environment. Being closer to the Sun than Earth, Amalthea receives more intense solar radiation, contributing to its temperature profile.

Escape Velocity & Flattening

The Amalthea escape velocity and shape characteristics reveal important details about its gravitational field and rotational dynamics. The Amalthea escape velocity of 0 m/s determines how easily objects can break free from its gravitational pull. This relatively low escape velocity means that gases and light molecules can easily escape into space, making it difficult for Amalthea to retain a substantial atmosphere. The Amalthea flattening of 0.0000% indicates how much the planet's rotation affects its shape. This minimal flattening suggests a nearly spherical shape, indicating either slow rotation or a very rigid internal structure.

FAQs About Amalthea

What is the gravity on Amalthea?

The gravity on Amalthea is 0.02 m/s² (490.5× smaller than Earth's gravity). This gravitational force determines how objects behave on the surface, affects atmospheric retention, and influences the planet's ability to hold onto gases and particles. A person weighing 70 kg on Earth would weigh 0.1 kg on Amalthea.

How big is Amalthea compared to Earth?

Amalthea has a radius of 84 km, making it 75.8× smaller than Earth's size. In terms of volume, Amalthea is 0.0× the size of Earth. This size difference significantly impacts the planet's gravity, atmospheric retention, geological processes, and overall planetary characteristics.

How far is Amalthea from the Sun?

Amalthea orbits at an average distance of 181,400 km (0.001 AU) from the Sun, placing it 824.7× smaller than Earth's distance from the Sun. This distance determines the amount of solar radiation the planet receives and significantly influences its temperature and climate.

How long is a year on Amalthea?

A year on Amalthea lasts 0.00 hours (63346881.6× smaller than Earth's orbital period). This orbital period defines the length of the planet's year and affects seasonal patterns, temperature variations, and the overall climate cycle.

What is Amalthea made of?

Amalthea has a density of 0.857 g/cm³ (6.4× smaller than Earth's density). This density provides important clues about the planet's internal composition. The low density indicates a composition dominated by lighter elements, characteristic of gas giants or icy bodies.

Does Amalthea have seasons?

Amalthea has an axial tilt of . With minimal axial tilt, the planet experiences virtually no seasonal changes, maintaining relatively constant temperatures throughout its year.
Discovery Information
Discovered By
E. Barnard
Discovery Date
09/09/1892
Raw Data