Star System UX-18 is a star system charted by Kitsurugi Uesu during his departure from Central Yamatai. This system is notable for its interesting variety of large planets and its huge star.

• K8 Ia Orange Supergiant
• Radius 3.01 x 10⁸ km (433.04 x sol)
• Mass 6.46 x 10³¹ kg (32.48 x sol)
• Temperature 3600 K
• Luminosity 9.72 x 10³⁰ W (25386.46 x sol)

• Type Rock Planet
• Orbital Radius 3.10 x 10^10 km (206.96 AU)
• Period 4.57 x 10⁶ hours (522.40 earth years)
• Gravity 38.13 m/s² (3.90 x earth)
• Large moon

• Type Rock Planet
• Orbital Radius 4.68 x 10^10 km (312.81 AU)
• Period 8.49 x 10⁶ hours (970.74 earth years)
• Gravity 26.01 m/s² (2.66 x earth)
• Special Wreckage of a crashed starship

• Type Asteroid Belt
• Orbital Radius 6.22 x 10^10 km (415.48 AU)
• Period 1.30 x 10⁷ hours (1485.97 earth years)

• Type Brown Dwarf
• Orbital Radius 1.07 x 10^11 km (715.80 AU)
• Period 2.94 x 10⁷ hours (3360.25 earth years)
• Gravity 771.36 m/s² (78.87 x earth)
• Planetary rings, 51 small moons, 4 large moons

• Uranian Planet
• Orbital Radius 3.20 x 10^11 km (2138.80 AU)
• Period 1.52 x 10⁸ hours (17355.63 earth years)
• Gravity 27.49 m/s² (2.81 x earth)
• 7 small moons

• Ice Planet
• Orbital Radius 6.02 x 10^11 km (4023.47 AU)
• Period 3.91 x 10⁸ hours (44780.23 earth years)
• Gravity 41.35 m/s² (4.23 x earth)
• Wreckage of a crashed starship

• Ice Planet
• Orbital Radius 1.22 x 10^12 km (8154.40 AU)
• Period 1.13 x 10⁹ hours (129203.14 earth years)
• Gravity 26.68 m/s² (2.73 x earth)
• Wreckage of a crashed starship