HX-7 is one of the twenty systems charted by Taisa Hanako while she commanded the YSS Elfin Princess in YE 30.

• Type G7 V Yellow Main Sequence
• Radius 6.37 x 10⁵ km (0.92 x sol)
• Mass 1.26 x 10³⁰ kg (0.63 x sol)
• Temperature 5200 K
• Luminosity 3.76 x 10²⁶ W (0.98 x sol)

• Type Rock Planet
• Orbital Radius 6.46 x 10⁷ km (0.43 AU)
• Period 3.12 x 10³ hours (0.36 earth years)
• Gravity 5.69 m/s² (0.58 x earth)

• Type Asteroid Belt
• Orbital Radius 8.86 x 10⁷ km (0.59 AU)
• Period 5.00 x 10³ hours (0.57 earth years)

• Type Terrestrial World
• Orbital Radius 1.23 x 10⁸ km (0.82 AU)
• Period 8.14 x 10³ hours (0.93 earth years)
• Physics Small ocean
• Hydrosphere 98 % water, 11 % ice
• Atmosphere Standard toxic
• Biosphere Microbes
• Special Electromagnetic storms

• Type Terrestrial World
• Orbital Radius 1.80 x 10⁸ km (1.20 AU)
• Period 1.45 x 10⁴ hours (1.66 earth years)
• Physics Small iron/silicate
• Hydrosphere 53 % water, 47 % ice
• Atmosphere Thin toxic
• Biosphere Microbes, algae

• Type Rock Planet
• Orbital Radius 3.09 x 10⁸ km (2.06 AU)
• Period 3.25 x 10⁴ hours (3.72 earth years)
• Gravity 11.61 m/s² (1.19 x earth)
• Special Planetary rings, trace atmosphere

• Type Rock Planet
• Orbital Radius 5.53 x 10⁸ km (3.70 AU)
• Period 7.81 x 10⁴ hours (8.93 earth years)
• Gravity 8.27 m/s² (0.85 x earth)
• Special Heavy volcanism

• Type Ice Planet
• Orbital Radius 1.03 x 10⁹ km (6.90 AU)
• Period 1.99 x 10⁵ hours (22.75 earth years)
• Gravity 15.22 m/s² (1.56 x earth)

• Type Small ocean
• Radius 4447.59 km (0.70 x earth)
• Surface Area 2.49 x 10⁸ km²
• Land Area 7.46 x 10⁶ km² (0.05 x earth)
• Mass 2.07 x 10²⁴ kg (0.35 x earth)
• Density 5.63 g/cm³ (1.02 x earth)
• Composition 30.5% oxygen, 22.3% iron, 16.2% magnesium, 9.9% silicon, 4.0% calcium, 16.2% other metals, 0.8% other elements

• Gravity 6.96 m/s² (0.71 x earth)
• Escape Velocity 7.87 km/s
• Rotation
• Period 20.48 hours
• Axis Tilt 15.56 °

• Water 98 %
• Ice 11 %

• Type Standard toxic
• Pressure 97.35 kPa (0.96 x earth)
• Composition 76.1% sulfur dioxide, 18.0% oxygen, 5.1% carbon dioxide, 0.7% argon, trace other gases

• Type Cool
• Min Temp 247 K (-25 °C)
• Avg Temp 298 K (25 °C)
• Max Temp 394 K (121 °C)

• Chemistry Carbon
• Lifeforms Microbes
• Special Features Electromagnetic storms

• Type Small iron/silicate
• Radius 1741.66 km (0.27 x earth)
• Surface Area 3.81 x 10⁷ km²
• Land Area 1.83 x 10⁷ km² (0.12 x earth)
• Mass 1.24 x 10²³ kg (0.02 x earth)
• Density 5.62 g/cm³ (1.02 x earth)
• Composition 29.8% oxygen, 25.9% iron, 17.5% magnesium, 15.3% silicon, 11.2% other metals, 0.3% other elements

• Gravity 2.72 m/s² (0.28 x earth)
• Escape Velocity 3.08 km/s
• Rotation
• Period 26.74 hours
• Axis Tilt 70.79 °

• Water 53 %
• Ice 47 %

• Type Thin toxic
• Pressure 22.54 kPa (0.22 x earth)
• Composition 52.8% sulfur dioxide, 26.3% oxygen, 18.9% carbon dioxide, 2.0% argon, trace other gases

• Type Cold
• Min Temp 189 K (-83 °C)
• Avg Temp 277 K (4 °C)
• Max Temp 383 K (110 °C)

• Chemistry Nitrogen-phosphorous
• Lifeforms Microbes, algae