HX-1 is the first of the twenty systems charted by Taisa Hanako while she commanded the YSS Elfin Princess in YE 30. It has one uninhabitable terrestrial world, HX-1 I.

• Type M8 V Red Dwarf
• Radius 2.83 x 10⁵ km (0.41 x sol)
• Mass 6.28 x 10²⁹ kg (0.32 x sol)
• Temperature 2200 K
• Luminosity 1.52 x 10²⁵ W (0.04 x sol)

• Type Terrestrial World
• Orbital Radius 2.73 x 10⁷ km (0.18 AU)
• Period 1.21 x 10³ hours (0.14 earth years)
• Physics Large ocean
• Hydrosphere 91 % water, 23 % ice
• Atmosphere Dense reducing
• Biosphere Prokaryotic microbes

For more information, see HX-1 I.

• Type Rock Planet
• Orbital Radius 5.54 x 10⁷ km (0.37 AU)
• Period 3.50 x 10³ hours (0.40 earth years)
• Gravity 11.00 m/s² (1.12 x earth)

• Type Rock Planet
• Orbital Radius 7.90 x 10⁷ km (0.53 AU)
• Period 5.97 x 10³ hours (0.68 earth years)
• Gravity 9.66 m/s² (0.99 x earth)

• Type Rock Planet
• Orbital Radius 1.35 x 10⁸ km (0.90 AU)
• Period 1.33 x 10⁴ hours (1.52 earth years)
• Gravity 12.40 m/s² (1.27 x earth)
• Special Planetary rings

• Type Ice Planet
• Orbital Radius 2.37 x 10⁸ km (1.59 AU)
• Period 3.10 x 10⁴ hours (3.55 earth years)
• Gravity 14.75 m/s² (1.51 x earth)

• Type Ice Planet
• Orbital Radius 4.56 x 10⁸ km (3.05 AU)
• Period 8.29 x 10⁴ hours (9.48 earth years)
• Gravity 1.36 m/s² (0.14 x earth)
• Special Trace atmosphere

• Type Ice Planet
• Orbital Radius 8.98 x 10⁸ km (6.00 AU)
• Period 2.29 x 10⁵ hours (26.17 earth years)
• Gravity 14.63 m/s² (1.50 x earth)
• Advanced Alien Artifact (Appliance or Machine)