Portia

Portia is a fascinating moon in our Solar System that has captured the attention of astronomers and space enthusiasts alike. With a Portia radius of 70 km, making it 91.0× 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 66,100 km (0.000 AU) from the Sun, Portia occupies a significant place in the Solar System's architecture. As a moon, Portia demonstrates the incredible diversity of natural satellites that orbit larger celestial bodies throughout our Solar System.

The Portia physical characteristics reveal a world of remarkable dimensions and properties. The Portia radius measures 70 km, making it 91.0× smaller than Earth's size. The Portia mass of 1.70e+18 kg represents 3512941.2× smaller than Earth's mass, giving this world substantial gravitational influence.

The Portia orbit reveals fascinating details about its journey around the Sun and its relationship to other Solar System objects. The Portia orbit has a semimajor axis of 66,100 km (0.000 AU), placing it 2263.2× smaller than Earth's distance from the Sun. The Portia orbit is nearly circular with an eccentricity of 0 (167.0× smaller than Earth's orbital eccentricity), resulting in relatively stable solar heating throughout its year. The Portia orbit takes 0.00 hours to complete (61492886.8× smaller than Earth's orbital period), defining the length of its year. The orbital inclination of 0.06° indicates how much the Portia orbit is tilted relative to the Solar System's ecliptic plane. This low inclination means Portia follows a path very close to the plane where most planets orbit, suggesting a stable formation history.

The Portia rotation and axial orientation provide crucial insights into its daily and seasonal cycles, as well as its orbital dynamics. The Portia axial tilt of 0° determines the intensity and nature of seasonal variations. With minimal axial tilt, Portia experiences virtually no seasonal changes, maintaining relatively constant temperatures throughout its year. The orbital orientation parameters reveal additional details about Portia'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 Portia temperature and atmospheric conditions are fundamental to understanding its habitability and environmental characteristics. The Portia average temperature of 0.0 K (-273.1 °C) (-459.7°F) provides the baseline for understanding its climate. These extremely cold temperatures make Portia 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), Portia presents a dramatically different thermal environment. Being closer to the Sun than Earth, Portia receives more intense solar radiation, contributing to its temperature profile.

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