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UX-3 II is the third and outermost planet in the UX-3 System. The air is breathable but this planet is a land of “ice and fire” due to its cold climate, high volcanism, and high oxygen.

High oxygen levels mean increased fire hazards and abundant sulfur dioxide gives the air a pungent stench and can severely irritate the eyes, lungs, and skin.

In YE 34 the planet was used as a dead drop for items, but the items were not picked up until the YSS Eucharis found them by chance around Halloween YE 35. The items were carried by Star Army Logistics to Fort Hanako.

In YE 34 the Scientific Studies Service (SSS) deployed a Ke-P6-02a Bisen Lighthouse in orbit above this planet at the request of the Star Army of Yamatai. It was placed in orbit due to the level of volcanism.

In YE 38, the crew of the YSS Eucharis visited the lighthouse in orbit and stayed there to recover after a battle with Rixxikor on UX-1 I.

Planetary Details


  • Type Standard ocean
  • Radius 6577.81 km (1.03 x earth)
  • Surface Area 5.44 x 108 km2
  • Land Area 1.41 x 108 km2 (0.95 x earth)
  • Mass 6.99 x 1024 kg (1.17 x earth)
  • Density 5.87 g/cm3 (1.06 x earth)
  • Composition 45.8% iron, 21.9% oxygen, 18.4% silicon, 8.5% titanium, 5.4% other metals, trace other elements


  • Gravity 10.74 m/s2 (1.10 x earth)
  • Escape Velocity 11.89 km/s


  • Period 12.96 hours
  • Axis Tilt 24.32 °


  • Water 75 %
  • Ice 40 %


  • Dense breathable
  • Pressure 168.86 kPa (1.67 x earth)
  • Composition 63.2% argon, 27.2% oxygen, 7.2% nitrogen, 2.4% sulfur dioxide, trace other gases


  • Cold
  • Min Temp 211 K (-61 °C)
  • Avg Temp 275 K (2 °C)
  • Max Temp 291 K (18 °C)


  • Chemistry Carbon
  • Lifeforms Prokaryotic microbes

Special Features

  • Heavy volcanism

planet/ux-3_iii.txt · Last modified: 2019/06/02 18:40 by