UX-28 is a star system in the Yamatai Star Empire's deep southern frontier, East of the Ketsurui Military Sector. It is part of the UX Series Star Systems.

None of the worlds in this system are habitable for human life, but one contains alien life.

In YE 43 the Yamatai Star Empire released its claim on this star system.

• Type: M8 V Red Dwarf
• Radius: 2.68 x 10⁵ km (0.39 x sol)
• Mass: 5.35 x 10²⁹ kg (0.27 x sol)
• Temperature: 2200 K
• Luminosity: 1.87 x 10²⁵ W (0.05 x sol)

• Type: Terrestrial World
• Orbital Radius: 2.99 x 10⁷ km (0.20 AU)
• Period: 1.51 x 10³ hours (0.17 earth years)
• Physics: Large iron/silicate
• Gravity: 11.49 m/s² (1.17 x earth)
• Hydrosphere: 44 % water, 14 % ice
• Atmosphere: Standard toxic
• Biosphere: Microbes, algae, worms
• Special: Heavy radiation

See: UX-28 I

• Type: Rock Planet
• Orbital Radius: 4.89 x 10⁷ km (0.33 AU)
• Period: 3.15 x 10³ hours (0.36 earth years)
• Gravity: 8.21 m/s² (0.84 x earth)
• Special: Heavy radiation

• Type: Rock Planet
• Orbital Radius: 7.18 x 10⁷ km (0.48 AU)
• Period: 5.61 x 10³ hours (0.64 earth years)
• Gravity: 3.01 m/s² (0.31 x earth)
• Special: Planetary rings

• Type: Rock Planet
• Orbital Radius: 1.11 x 10⁸ km (0.74 AU)
• Period: 1.08 x 10⁴ hours (1.24 earth years)
• Gravity: 11.72 m/s² (1.20 x earth)
• Special: Trace atmosphere

• Type: Ice Planet
• Orbital Radius: 1.93 x 10⁸ km (1.29 AU)
• Period: 2.48 x 10⁴ hours (2.83 earth years)
• Gravity: 6.26 m/s² (0.64 x earth)

• Type: Ice Planet
• Orbital Radius: 3.58 x 10⁸ km (2.39 AU)
• Period: 6.23 x 10⁴ hours (7.12 earth years)
• Gravity: 6.22 m/s² (0.64 x earth)

• Type: Ice Planet
• Orbital Radius: 6.79 x 1^08 km (4.54 AU)
• Period: 1.63 x 10⁵ hours (18.65 earth years)
• Gravity: 3.98 m/s² (0.41 x earth)
• Special: 4 small moons