Irida (ee-ree-dah)

Alternative Name(s)
the moon
Type
Planetoid / Moon
Location under
Classification (Primary)
Captured Planetary Embryo.
Classification (Secondary)
Satellite of a Super-Earth (Astraia).
Diameter
3,500 km.
Mass
9.54×1021 kg.
Density
3,654 kg/m3.
Volume
2.61×1018 m3.
Orbital Distance
200,000 km.
Orbits
Astraia (Super-Earth).
Rotation Type
Tidal Lock (Synchronus).
Rotation Period (Day Length)
240 hours.
Orbital Period (Year Length)
240 hours (10 Earth days).
Tidal Forces (from Astraia)
2.066×1016 N.
Magnetic Field
20-30 μT.
Background Radiation
5.6 mSv/year.
Radiation Contribution to Astraia
0.0002 mSv/year.

Tectonics

Tectonic Activity Heat Flow
Not Calculated Yet
Internal Heat
1.42×1018 W.
Tidal Heating
2.78×105 W.
External Heating
1.10×1017 W.
Total Heat Flow
1.53×1018 W.
Heat Flow per Unit Area
39.74 W/m2.
Geothermal Gradient
0.50 K/km.
Thermal Conductivity
78.32 W/m·K.

The Crust

Crust Composition Crust Characteristics
Silicon (Si)
24%
Oxygen (O)
43.5%
Aluminum (Al)
7.8%
Iron (Fe)
5.5%
Calcium (Ca)
3.2%
Sodium (Na)
2.3%
Potassium (K)
0.9%
Magnesium (Mg)
1.8%
Sulfur (S)
3%
Titanium (Ti)
0.5%
Uranium (U)
0.015%
Thorium (Th)
0.05%
Potassium-40 (K-40)
0.1%
Other Trace Elements
0.235%
Crust Density
2450 kg/m3.
Crust Thickness
20-40 km (30 km average).
Crust Volume
2.6×1017 m3.
Crust Mass
6.37×1020 kg.
Crust Thermal Conductivity
71.12 W/m·K.

The Mantle

Mantle Composition Mantle Characteristics
Silicon (Si)
20.5%
Oxygen (O)
37.5%
Magnesium (Mg)
19.5%
Iron (Fe)
5.5%
Calcium (Ca)
2.3%
Aluminum (Al)
1.9%
Potassium (K)
0.4%
Titanium (Ti)
0.2%
Sulfur (S)
2%
Uranium (U)
0.01%
Thorium (Th)
0.04%
Potassium-40 (K-40)
0.08%
Other Trace Elements
0.57%
Mantle Volume
1.82×1018 m3.
Mantle Density
2,632 kg/m3.
Mantle Mass
4.79×1021 kg.
Mantle Thickness
1,220 km.
Mantle Thermal Conductivity
78.86 W/m·K.

The Core

Core Composition Core Characteristics
Iron (Fe)
89%
Nickel (Ni)
8.5%
Sulfur (S)
0.5%
Phosphorus (P)
0.5%
Oxygen (O)
1.5%
Other Heavy Elements
0.5%
Core Radius
500 km.
Core Volume
5.24×1017 m3.
Core Density
7,852 kg/m3.
Core Mass
4.11×1021 kg.
Core Thermal Conductivity
79.30 W/m·K.
Core Pressure
4.31 GPa.

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