UX-4 I is a planet in the UX-4 System. It is secretly used as a hidden base by a pirate and/or Smuggling faction.

In YE 35 the Scientific Studies Service (SSS) deployed a Ke-P6-01a Bisen Lighthouse on the surface of the planet at the request of the Star Army of Yamatai. It is located near the equator.

• Type Large iron/silicate
• Radius 10284.33 km (1.61 x earth)
• Surface Area 1.33 x 10⁹ km²
• Land Area 8.64 x 10⁸ km² (5.80 x earth)
• Mass 2.37 x 10²⁵ kg (3.97 x earth)
• Density 5.20 g/cm³ (0.94 x earth)
• Composition 35.5% iron, 28.3% oxygen, 20.7% silicon, 10.2% nickel, 4.4% sulphur, 0.1% other metals, 0.7% other elements

• Gravity 14.88 m/s² (1.52 x earth)
• Escape Velocity 17.50 km/s
• Rotation
• Period 18.41 hours
• Axis Tilt 43.06 °

• Water 36 %
• Ice 29 %

• Type Dense toxic
• Pressure 224.32 kPa (2.21 x earth)
• Composition 48.4% carbon dioxide, 35.4% argon, 16.2% oxygen, trace other gases

• Type Cool
• Min Temp 234 K (-38 °C)
• Avg Temp 288 K (15 °C)
• Max Temp 325 K (52 °C)

• Chemistry Carbon
• Lifeforms Microbes, algae

• Type Pirate/Smuggler Base
• Population 5546
• Tech Level Spacefaring (orbital spacecraft, cybernetics, laser weapons)

• Electromagnetic storms