Astraia (ah-strey-ah)

Maps

Astraia Global Map

Type

Planet

Location under

The Ilios System

Included Locations

Inhabiting Species

Planet Class

Super-Earth / Super-Terrestrial.

Satellites

Irida - Moon

Radius

8,981 km.

Gravity

1.53 G.

Surface Gravity

15.06 m/s².

Orbital Distance

0.718 AU.

Rotational Period (Day Length)

26 hours.

Orbital Period (Year Length)

246.7 days.

Orbital Period in Earth Time

267.3 days.

Axial Tilt

20°.

Magnetic Field Strength

54.4 μT.

Background Radiation

0.76 mSv/year.

Average Surface Temperature

17.33°C (290.48 k).

Equatorial Temperature

35°C.

Polar Temperature (Winter)

0°C.

Polar Temperature (Summer)

12°C.

Water Prevalence

60%.

Global Precipitation

26 in.

Surface Pressure

149.3 kPa.

Scale Height

54.5 km.

The Atmosphere

Atmospheric Composition	Atmospheric Characteristics
Nitrogen (N₂) 75% Oxygen (O₂) 22% Carbon Dioxide (CO₂) 0.03% Argon (Ar) 1.5% Water Vapor (H₂O) 0.75% Other Trace Gases 0.72%	Hadley Cells Extend to 30° latitude. Wind Patterns Easterly trades, westerlies, and polar easterlies. Equatorial Jetstream Speed 50-80 m/s. Polar Jetstream Speed 30-50 m/s.

Atmospheric Layers

Troposphere:	Stratosphere:
Thickness 11.2 km. Base Altitude 0 km. Top Altitude 11.2 km.	Thickness 40 km. Base Altitude 11.2 km. Top Altitude 51.2 km.
Mesosphere:	Thermosphere:
Thickness 64 km. Base Altitude 51.2 km. Top Altitude 115.2 km.	Thickness 120 km. Base Altitude 115.2 km. Top Altitude 235.2 km.
Exosphere:	Other Notes:
Starts Beyond 235.2 km. Characteristics Thins out and transitions into space.	Lunar Corridor The moon's low orbit passage through the thermosphere creates a corridor in its wake of lower density, lower temperature air within the thermosphere. This corridor undergoes regular fluctuations as Irida orbits Astraia.

Tectonics

Tectonic Dynamics	Heat Flow
Slower Plate Movements Due to reduced internal heat and increased mantle density compared to Earth. Thicker Crust Due to slower recycling and less vigorous tectonics. Continental Stability More stable continental regions with slower changes over geological timescales. Tectonic Activity Slower and less active than Earth, leading to thicker crust and stable landmasses. Tectonic Plates 5-7 large plates with smaller microplates. Eruption Frequency 10-20 significant eruptions per century. Volcanic Gas Emissions SO₂: 5-10 million tons/year. CO₂: 50-100 million tons/year.	Geothermal Gradient 1.15 K/km. Thermal Conductivity 3.5 W/m/K. Global Heat Flow 4.025 W/m². -----------------------------------------------------------------------------

The Crust

Crust Composition	Crust Characteristics
Silicon (Si) 28% Aluminum (Al) 7.5% Iron (Fe) 6.5% Magnesium (Mg) 2.5% Calcium (Ca) 3.5% Sodium (Na) 2.5% Potassium (K) 1.5% Titanium (Ti) 0.66% Other Elements Not calculated. Silicate Minerals Dominant in the crust.	Crust Density 2,800 kg/m³. Continental Crust Thickness 35-45 km (average 40 km). Oceanic Crust Thickness 5-10 km (average 7.5 km). Continental Crust Volume 14.14×10⁹ km³ Oceanic Crust Volume 4.93×10⁹ km³ Total Crust Volume 19.07×10⁹ km³ Crust Mass 5.34×10²⁵ kg. Crust Density 2,800 kg/m³. Continental Crust Thickness 35-45 km (average 40 km). Oceanic Crust Thickness 5-10 km (average 7.5 km). Continental Crust Volume 14.14×10⁹ km³. Oceanic Crust Volume 4.93×10⁹ km³. Total Crust Volume 19.07×10⁹ km³. Crust Mass 5.34×10²⁵ kg.

The Mantle

Mantle Composition	Mantle Characteristics
Silicate Minerals 44% (Olivine, Pyroxenes) Magnesium (Mg) 22% Iron (Fe) 28% Calcium (Ca), Aluminum (Al) 4% Other Elements 2%	Mantle Density 4,800 kg/m³. Mantle Thickness 4,081 km. Mantle Volume 1.20×10²¹ m³. Mantle Mass 5.76×10²⁴ kg. Heat Production 70-80% of Earth’s mantle heat.

The Core

Core Composition	Core Characteristics
Iron (Fe) 88% Nickel (Ni) 8% Heavy Metals 3% Trace Elements 1%	Core Density 8,267.4 kg/m³. Core Radius 4,850 km. Core Volume 4.78×10²⁰ m³. Core Mass 3.95×10²⁴ kg. Core Heat Generation 70-80% of Earth’s.

Astraia (ah-strey-ah)

Maps

Astraia Global Map

The Atmosphere

Atmospheric Layers

Tectonics

The Crust

The Mantle

The Core

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