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System: Assyria

Primary Star: HD 38529

Stellar Type: G4V

Companion Star(s): None

Distance from Earth: 138 ly

Constellation: Orion

Region: Inner

Population: 960 Million



The Assyria system contains two planets discovered in 2000, a hot Jupiter and a brown dwarf, and five discovered later.  The most interesting thing about the system is the brown dwarf orbiting inside the habitable zone.  The brown dwarf has four large moons orbiting it with the inside one being very much Earthlike.  On this world a large population of nearly a billion has grown.




Assyria b

This ¾ Jupiter mass world orbits close to the parent star.  The world is a dark hot Jupiter orbiting only 0.13 AU from the star giving it a temperature of 1100 K.







Assyria c

Assyria C is brown dwarf with 13 times the mass of Jupiter which has an eccentric orbit around the primary star.  This orbit takes from the middle of the habitable zone to just outside it.  The brown dwarf gives off heat helping keep the first moon warm enough for life.





Assyria c1

The system’s habitable world orbits the brown dwarf Assyria c.  C1 is a mountainous world with deep valleys and rich natural resources.  Earthquakes are common on this heavily tectonically active world.  The winters can get very cold on this world as brown dwarf moves away from the parent star on its eccentric orbit.  The planet is close enough to the brown dwarf to receive sufficient heat to keep it from freezing during the long winter months.  This is the reason why it is a habitable world unlike the outer moons.




Assyria c2

The 2nd planet orbiting the brown dwarf is a dry barren world lacking an atmosphere.





Assyria c3

A3 is a the outermost planet orbiting the brown dwarf, the dry surface is hidden under a thick atmosphere.







Assyria d

Cold gas giant orbiting far away from the sun.







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