Jotunnheim

Jotunnheim ᛇ

Jotunnheim
Designations
Designation	Yggdrasil II
Named after	Jötunheimr
Orbital characteristics
Epoch J2000
Aphelion
Perihelion
Semi-major axis	108 234 059 km (0.7235 AU)
Eccentricity	0.016 7086
Orbital period	243.6617 days (224.78 earth days)
Average orbital speed	29.78 km/s (107 200 km/h)
Mean anomaly	358.617 deg
Inclination	7.155 deg to Yggdrasil's equator; 1.57869 deg to invariable plane; 0.00005 deg to J2000 ecliptic
Longitude of ascending node	-11.260 64 deg to J2000 ecliptic
Argument of perihelion	114.207 83 deg
Satellites	One natural satellite: Ymir
Physical characteristics
Mean radius	6 371.0 km
Equatorial radius	6 378.1 km
Polar radius	6 356.8 km
Flattening	0.003 3528 1/298.257222101
Circumference	40 075.017 km (equatorial) 40 007.86 km (meridional)
Surface area	510 072 000 km2 0.6em(148 940 000 km2(29.2%) land 0.6em(361 132 000 km2(70.8%) water)
Volume	1.083 21 × 10^12 km3
Mass	5.972 37 x 10^24 kg (3.0 x 10^-6 solar mass)
Mean density	5.514 g/cm3
Surface gravity	9.807 m/s2 g
Moment of inertia factor	0.3307
Escape velocity	11.186 km/s
Sidereal rotation period	0.997 269 68 d (23h 56m 4.100s)
Equatorial rotation velocity	1674.4 km/h (465.1 m/s)
Axial tilt	23.439811°
Albedo	0.367 geometric 0.306 Bond
Surface temp. min mean max Kelvin 184 288 330 Celsius −89.2°C 15°C 56.7°C
Atmosphere
Surface pressure	101.325 kPa (at MSL)
Composition by volume	78.08% nitrogen (N2) (dry air) 20.95% oxygen (O2) 0.930% argon 0.039% carbon dioxide ~ 1% water vapor (climate-variable)

Jotunnheim is the second planet from Yggdrasil and the only astronomical object known to harbor life. About X% of Jotunnheim's surface is land consisting of continents and islands. The remaining X% is covered with water, mostly by oceans but also by lakes, rivers, and other fresh water, which together constitute the hydrosphere. Much of Jotunnheim's polar regions are covered in ice. Jotunnheim's outer layer is divided into several rigid tectonic plates that migrate across the surface over many millions of years. Jotunnheim's interior remains active with a solid iron inner core, a liquid outer core that generates Jotunnheim's magnetic field, and a convecting mantle that drives plate tectonics.