Jupiter

Jupiter is the largest planet within the Solar System. It has, also, managed to win a metaphorical lottery - it has several habitable moons (that offer the highest quality of life from all Outer System celestial bodies) and remains a vast treasure trove of natural resources. Unfortunately, this wasn't enough to stop its entire subsystem from being the Solar System's last remaining totalitarian regime.

Natural Resources

Unlike other gas giants in the system, Jupiter itself qualifies as a colonized world due to a permanent population measured in millions. Its inhabitants live in a network of orbital cities, whose main product and export is hydrogen harvested from the planet below them.
It's the Solar System's primary producer of starship fuel, most of which gets exported by the Iron Pact at dumping prices in order to make potential political revolutions in their subsystem a source of massive economical upheaval for the Solar Commonwealth as a whole.

History

Jupiter was initially colonized by the terran predecessors of the Iron Pact, the Western European fascists that have emerged as a superpower following the Days of Fire. While the Union of Progress and Freedom and the Alliance for the Preservation of Democracy succeded in blocking them from colonizing things closer to Earth, they eventually decided to go for a long-shot and moved all the way to the Jupiter Subsystem. Which they promptly changed into their stronghold.
Initially they only colonized some of the moons (namely, Himalia and Europa), but eventually this process expanded to other places of the Jupiter Subsystem, including the gas giant itself (although that's actually a relatively recent development, which began to rapidly expand in the years following the Blackout).
Back then, it was done under the flag of the Jovian Republic, an authoritarian republic that emerged following the collapse of the first Iron Pact. Many considered it to be the extension of the Iron Pact, rebranded to avoid scrutiny of the Inner System's powers, ruled from the shadows by the descendants of the old ruling party.
Those suspicions were proven correct when - soon after the Blackout - the Jovian Republic officially turned back into the Iron Pact, and has fully embraced radical policies of old.

Jupiter
Summary
Distance from Sun: 778.57 million km
Diameter: 139 800 km
Solar Constant: 0.073
Mass: 317.8 Earths
Gravity: 2.54g
Mean Density: 1.326 kg/l
Day Length: 0.414 Earth days
Year Length: 11.868 Earth years
Rotation Axial Tilt: <10 degrees
Avg. Temperature per Latitude
N/A

Astrography

Object Type: Gas Giant
Object Subtype: Sudarsky-I Class
Primary Location: Core Sector
Secondary Location: Solar System
Tertiary Location: Jupiter Subsystem
Satellites: Multiple, listed beneath.
Transshipment Station: Himalia

Habitation Status

Status: Colonized
Classification: Mining World
Population: ~8 mln.
Capital: Jupiter Central Station
Government: Iron Pact
Solar Commonwealth Member: Yes.

Notable Satellites

Callisto
Europa
Ganymede
Himalia
Io