Mimas

Mimas is a fascinating moon in our Solar System that has captured the attention of astronomers and space enthusiasts alike. With a Mimas radius of 396.4 km, making it 16.1× 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 185,539 km (0.001 AU) from the Sun, Mimas occupies a significant place in the Solar System's architecture. As a moon, Mimas demonstrates the incredible diversity of natural satellites that orbit larger celestial bodies throughout our Solar System.

The Mimas physical characteristics reveal a world of remarkable dimensions and properties. The Mimas radius measures 396.4 km, making it 16.1× smaller than Earth's size. The Mimas mass of 3.79e+19 kg represents 157572.6× smaller than Earth's mass, giving this world substantial gravitational influence.

The Mimas orbit reveals fascinating details about its journey around the Sun and its relationship to other Solar System objects. The Mimas orbit has a semimajor axis of 185,539 km (0.001 AU), placing it 806.3× smaller than Earth's distance from the Sun. At its closest approach (perihelion), Mimas comes within 181,770 km of the Sun, while at its farthest point (aphelion), it reaches 189,270 km, creating a 4.0% variation in solar distance. The Mimas orbit is nearly circular with an eccentricity of 0.02 (1.2× Earth's orbital eccentricity), resulting in relatively stable solar heating throughout its year. The Mimas orbit takes 0.00 hours to complete (33572499.5× smaller than Earth's orbital period), defining the length of its year. The orbital inclination of 1.53° indicates how much the Mimas orbit is tilted relative to the Solar System's ecliptic plane. This low inclination means Mimas follows a path very close to the plane where most planets orbit, suggesting a stable formation history.

The Mimas rotation and axial orientation provide crucial insights into its daily and seasonal cycles, as well as its orbital dynamics. The Mimas rotation period of 0.01 hours (3819.3× 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 Mimas axial tilt of 0° determines the intensity and nature of seasonal variations. With minimal axial tilt, Mimas experiences virtually no seasonal changes, maintaining relatively constant temperatures throughout its year. The orbital orientation parameters reveal additional details about Mimas's position in space. The mean anomaly of 0° indicates the planet's current position in its orbit relative to its perihelion. The argument of periapsis of 0° shows how the orbit's orientation changes over time due to gravitational perturbations. The longitude of ascending node of 0° defines the reference point where the orbit crosses the ecliptic plane.

The Mimas temperature and atmospheric conditions are fundamental to understanding its habitability and environmental characteristics. The Mimas average temperature of 0.0 K (-273.1 °C) (-459.7°F) provides the baseline for understanding its climate. These extremely cold temperatures make Mimas 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), Mimas presents a dramatically different thermal environment. Being closer to the Sun than Earth, Mimas receives more intense solar radiation, contributing to its temperature profile.

The Mimas escape velocity and shape characteristics reveal important details about its gravitational field and rotational dynamics. The Mimas 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 Mimas to retain a substantial atmosphere. The Mimas 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.