UX-3 is one of the UX Series Star Systems. In YE 35, the Yamatai Star Empire laid claim to this star system.

It has two terrestrial worlds, UX-3 II and UX-3 III; however, only UX-3 III is suitable for life. The Yamatai Star Empire placed orbital communications networks of Emrys Satellites around all of the terrestrial planets in YE 36.

In YE 41, during the Kuvexian Invasion of YE 41 (part of the Kuvexian War), this star system fell to the forces of the Interstellar Kingdom Of Kuvexia and was under occupation.

By YE 42 the habitable planet had a new city called Sood Zadra.

• G4 V Yellow Main Sequence
• Radius 7.97 x 10⁵ km (1.15 x sol)
• Mass 2.47 x 10³⁰ kg (1.24 x sol)
• Temperature 5500 K
• Luminosity 5.54 x 10²⁶ W (1.45 x sol)

• Rock Planet
• Orbital Radius 9.75 x 10⁷ km (0.65 AU)
• Period 4.12 x 10³ hours (0.47 earth years)
• Gravity 12.24 m/s² (1.25 x earth)

• Terrestrial World
• Orbital Radius 1.38 x 10⁸ km (0.92 AU)
• Period 6.95 x 10³ hours (0.80 earth years)
• Physics Large iron/silicate
• Gravity 13.41 m/s² (1.37 x earth)
• Hydrosphere 0 % water, 0 % ice
• Atmosphere Superdense toxic

• Type Terrestrial World
• Orbital Radius 1.93 x 10⁸ km (1.29 AU)
• Period 1.15 x 10⁴ hours (1.32 earth years)
• Physics Standard ocean
• Gravity 10.74 m/s² (1.10 x earth)
• Hydrosphere 75 % water, 40 % ice
• Atmosphere Dense breathable
• Biosphere Prokaryotic microbes
• Heavy volcanism
• Orbital Ke-P6-02a Bisen Lighthouse