Ymir

Ymir is a fascinating moon in our Solar System that has captured the attention of astronomers and space enthusiasts alike. With a Ymir radius of 9 km, making it 707.9× 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 2.30e+7 km (0.154 AU) from the Sun, Ymir occupies a significant place in the Solar System's architecture. As a moon, Ymir demonstrates the incredible diversity of natural satellites that orbit larger celestial bodies throughout our Solar System.

The Ymir physical characteristics reveal a world of remarkable dimensions and properties. The Ymir radius measures 9 km, making it 707.9× smaller than Earth's size. The Ymir mass of 3.97e+15 kg represents 1504282115.9× smaller than Earth's mass, giving this world substantial gravitational influence.

The Ymir orbit reveals fascinating details about its journey around the Sun and its relationship to other Solar System objects. The Ymir orbit has a semimajor axis of 2.30e+7 km (0.154 AU), placing it 6.5× smaller than Earth's distance from the Sun. The Ymir orbit is moderately elliptical with an eccentricity of 0.187 (11.2× Earth's orbital eccentricity), creating noticeable seasonal variations in solar radiation. The Ymir orbit takes 0.37 hours to complete (23991.3× smaller than Earth's orbital period), defining the length of its year. The orbital inclination of 167.9° indicates how much the Ymir orbit is tilted relative to the Solar System's ecliptic plane. This high inclination suggests Ymir may have experienced significant gravitational perturbations or formed in a different region of the Solar System.

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

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